Title of the invention: Optical fiber sensing system, optical fiber sensing device, and underground behavior monitoring method
Technical field
[0001]
This disclosure relates to an optical fiber sensing system, an optical fiber sensing device, and an underground behavior monitoring method.
Background technology
[0002]
Recently, a tunnel has been excavated in the ground around the border, and illegal immigration across the border through the tunnel has become a problem. Therefore, it is required to find a tunnel.
For example, in the technique disclosed in Patent Document 1, a plurality of vibration sensors are provided on an optical fiber provided in the ground. Then, by detecting the vibration of the vibration sensor via the oscillation of the optical fiber, the underground vibration related to the activity related to the tunnel (for example, the activity of constructing the tunnel) is detected.
Prior art literature
Patent documents
[0003]
Patent Document 1: Japanese Patent Application Laid-Open No. 2016-532108
Outline of the invention
Problems to be solved by the invention
[0004]
However, in the technique disclosed in Patent Document 1, since vibration is detected for each vibration sensor, when monitoring a wide monitoring area such as a border, the distance between the vibration sensors becomes wide and there are places where vibration cannot be detected. do. Therefore, there is a risk that suspicious behavior such as tunnel excavation in the ground cannot be detected.
[0005]
Further, the technique disclosed in Patent Document 1 requires a special structure in which a vibration sensor is provided on an optical fiber. Therefore, the cost required for detecting suspicious behavior such as tunnel excavation in the ground increases.
[0006]
Therefore, the purpose of the present disclosure is to solve the above-mentioned problems and to provide an optical fiber sensing system, an optical fiber sensing device, and an underground behavior monitoring method capable of detecting suspicious behavior in the ground at low cost in a wide monitoring area. To provide.
Means to solve problems
[0007]
The optical fiber sensing system according to one aspect is
Optical fiber that detects vibration in the ground,
An acquisition unit that acquires an optical signal on which the vibration detected by the optical fiber is superimposed from the optical fiber, and
Based on the vibration pattern of the optical signal acquired by the acquisition unit, the specific unit that identifies suspicious behavior in the ground and the specific unit
Equipped with.
[0008]
The optical fiber sensing device according to one aspect is
An acquisition unit that acquires an optical signal on which the vibration detected by the optical fiber is superimposed from an optical fiber that detects vibration in the ground.
Based on the vibration pattern of the optical signal acquired by the acquisition unit, the specific unit that identifies suspicious behavior in the ground and the specific unit
Equipped with.
[0009]
The underground behavior monitoring method according to one aspect is
It is an underground behavior monitoring method using an optical fiber sensing system.
The step that the optical fiber detects vibration in the ground,
The acquisition step of acquiring an optical signal on which the vibration detected by the optical fiber is superimposed from the optical fiber, and
A specific step to identify suspicious behavior in the ground based on the vibration pattern of the optical signal acquired in the acquisition step,
including.
The invention's effect
[0010]
According to the above aspect, it is possible to provide an optical fiber sensing system, an optical fiber sensing device, and an underground behavior monitoring method that can inexpensively detect suspicious behavior in the ground in a wide monitoring area.
A brief description of the drawing
[0011]
FIG. 1 is a diagram showing a configuration example of an optical fiber sensing system according to a first embodiment.
FIG. 2 is a diagram showing an example of suspicious behavior specified by the optical fiber sensing system according to the first embodiment.
FIG. 3 is a diagram showing an example of suspicious behavior specified by the optical fiber sensing system according to the first embodiment.
FIG. 4 is a flow chart showing an operation example of the optical fiber sensing system according to the first embodiment.
FIG. 5 is a diagram showing a configuration example of an optical fiber sensing system according to a second embodiment.
FIG. 6 is a flow chart showing an operation example of the optical fiber sensing system according to the second embodiment.
FIG. 7 is a diagram showing a configuration example of an optical fiber sensing system according to a third embodiment.
FIG. 8 is a flow chart showing an operation example of the optical fiber sensing system according to the third embodiment.
FIG. 9 is a diagram showing a configuration example of an optical fiber sensing system according to a fourth embodiment.
FIG. 10 is a flow chart showing an operation example of the optical fiber sensing system according to the fourth embodiment.
FIG. 11 is a diagram showing a configuration example of an optical fiber sensing system according to a fifth embodiment.
FIG. 12 is a diagram showing an example of a method in which a position specifying unit according to a fifth embodiment identifies a position where a suspicious behavior occurs.
FIG. 13 is a diagram showing an example of a method in which a position specifying unit according to a fifth embodiment identifies a position where a suspicious behavior occurs.
FIG. 14 is a flow chart showing an operation example of the optical fiber sensing system according to the fifth embodiment.
FIG. 15 is a diagram showing a configuration example of an optical fiber sensing system according to another embodiment.
FIG. 16 is a diagram showing a configuration example of an optical fiber sensing system according to another embodiment.
FIG. 17 is a diagram showing an example of a GUI screen used for notification by the notification unit according to another embodiment.
[Fig. 18] Fig. 18 is a block diagram showing an example of a hardware configuration of a computer that realizes an optical fiber sensing device.
Embodiment for carrying out the invention
[0012]
Hereinafter, embodiments of the present disclosure will be described with reference to the drawings. The following descriptions and drawings have been omitted or simplified as appropriate for the sake of clarification of the explanation. Further, in each of the following drawings, the same elements are designated by the same reference numerals, and duplicate explanations are omitted as necessary.
[0013]

First, a configuration example of the optical fiber sensing system according to the first embodiment will be described with reference to FIG.
[0014]
As shown in FIG. 1, the optical fiber sensing system according to the first embodiment includes an optical fiber 10A and an optical fiber sensing device 20. Further, the optical fiber sensing device 20 includes an acquisition unit 21 and a specific unit 22.
[0015]
The optical fiber 10A is provided in the underground G of the monitoring area, and one end thereof is connected to the optical fiber sensing device 20. The monitoring area is, for example, a border, a perimeter of a facility, or the like. The facilities are, for example, prisons, nursery centers, animal breeding facilities, theme parks, airports, and the like. Further, a fence F is provided in the monitoring area. The fence F is arranged, for example, along the border, which is a monitoring area, or around the facility.
[0016]
The optical fiber 10A may be entirely laid in the underground G, may be laid on the ground by laying all in the fence F, or may be partially laid in the underground G. Other parts may be laid on the ground.
[0017]
Further, the optical fiber 10A is arranged linearly along the fence F in a plane substantially horizontal to the ground in the underground G. However, the present invention is not limited to this, and the optical fiber 10A may be arranged so as to meander in a curved line in a plane substantially horizontal to the ground in the underground G.
[0018]
Further, the optical fiber 10A is stored inside the cable P provided in the underground G. However, the present invention is not limited to this, and the optical fiber 10A may be attached to or wound around the outer peripheral surface of the cable P, or may be arranged in such a manner that the cable P is not used. As an embodiment in which the cable P is not used, for example, the optical fiber 10A may be housed in a box installed in the underground G. Further, the optical fiber 10A may be passed through the inside of a pipe provided in the underground G.
[0019]
The acquisition unit 21 incidents pulsed light on the optical fiber 10A. Further, the acquisition unit 21 receives the reflected light or scattered light generated when the pulsed light is transmitted through the optical fiber 10A as return light (optical signal) via the optical fiber 10A.
[0020]
When some event occurs in the underground G, vibration or sound corresponding to the event is generated. Since sound is a type of vibration, the term "vibration" will be described below as including not only general vibration but also sound. The vibration corresponding to the event generated in the underground G is superimposed on the return light transmitted by the optical fiber 10A. Therefore, the optical fiber 10A can detect the vibration generated in the underground G.
[0021]
Therefore, when some event occurs in the ground G, the optical fiber 10A detects the vibration corresponding to the event and superimposes it on the return light for transmission, and the acquisition unit 21 superimposes the vibration detected by the optical fiber 10A. The returned light will be acquired (received). When only a part of the optical fiber 10A is arranged in the ground G, the acquisition unit 21 acquires the return light on which the vibration detected by the portion of the optical fiber 10A arranged in the ground G is superimposed. Just do it.
[0022]
Here, the return light on which the vibration is superimposed has a unique vibration pattern in which the strength of the vibration, the vibration position, the transition of the fluctuation of the frequency, etc. differ depending on the event that caused the vibration. For example, as shown in FIG. 2, if a suspicious behavior of excavating a tunnel occurs in the underground G, the return light superimposed with the vibration generated in response to the tunnel excavation has a vibration pattern peculiar to the tunnel excavation. Will have.
[0023]
Therefore, by analyzing the dynamic change of the vibration pattern of the return light, it is possible to identify the suspicious behavior in the underground G as the event that caused the vibration. In addition to the above-mentioned behavior of excavating a tunnel, suspicious behavior in underground G includes walking inside an already excavated tunnel, walking and carrying things, operating transportation equipment, and carrying things with transportation equipment. , Moving in the existing pipe, carrying things in the existing pipe, etc. are also conceivable. In addition, regarding the excavation of a tunnel, the behavior of excavating by a person and the behavior of excavating by an excavator can be considered.
[0024]
Therefore, the specific unit 22 detects the vibration pattern of the return light from the return light acquired by the acquisition unit 21 from the optical fiber 10A. Then, the specifying unit 22 identifies the suspicious behavior in the underground G based on the vibration pattern of the return light.
[0025]
For example, when excavating a tunnel in the underground G across the border, the tunnel will be excavated from a position away from the border toward the border. Therefore, it is considered that periodic vibrations occur in the vicinity of the border and the intensity of the vibrations gradually increases. Therefore, as a result of analyzing the dynamic change of the vibration pattern of the return light, the specific unit 22 detects periodic vibration at a position near the border on the optical fiber 10A, and the intensity of the vibration gradually increases. When it becomes large, it can be determined that the tunnel is excavated in the underground G.
[0026]
Regarding the position (distance of the optical fiber 10A from the acquisition unit 21) on the optical fiber 10A where the vibration is detected, the specific unit 22 has, for example, the time when the acquisition unit 21 incidents the pulsed light on the optical fiber 10A. It is possible to specify the position on the optical fiber 10A based on the time difference between the time when the acquisition unit 21 receives the return light on which the vibration is superimposed from the optical fiber 10A.
[0027]
Further, the specific unit 22 may specify suspicious behavior in the underground G by using pattern matching.
For example, as a vibration pattern of the return light, a vibration pattern of vibration generated when a suspicious behavior occurs in the ground G (hereinafter, appropriately referred to as a vibration pattern of the suspicious behavior in the ground G) is not shown. Store it in the department in advance. The vibration pattern of a plurality of suspicious behaviors in the underground G may be stored in the storage unit. Further, the vibration pattern of the suspicious behavior in the underground G may be learned by the specific unit 22 or the learning unit (not shown) by machine learning or the like. When specifying the suspicious behavior in the ground G, the specifying unit 22 compares the vibration pattern of the return light with the vibration pattern of the suspicious behavior in the ground G stored in advance. When the vibration pattern of the return light matches any of the vibration patterns of the suspicious behavior, the specific unit 22 performs the suspicious behavior corresponding to the matching vibration pattern in the underground G.Is determined to have occurred.
[0028]
Here, an example of a vibration pattern of suspicious behavior in underground G will be described.
For example, a suspicious action in the underground G is an action in which a person or an excavator excavates a tunnel in the underground G. Therefore, the vibration pattern generated by excavating the tunnel is used as the vibration pattern of suspicious behavior in the underground G. When tunnel excavation occurs, as described above, periodic vibration occurs and the intensity of the vibration gradually increases. Therefore, the vibration pattern generated by excavating a tunnel is, for example, a vibration pattern in which periodic vibration is generated and the intensity of the vibration gradually increases.
[0029]
Also, in the underground G, the behavior of a person moving through an existing tunnel or pipe is also a suspicious behavior. Among them, when existing tunnels and pipes are arranged across borders such as borders, the behavior of people moving through the tunnels and pipes may be smuggling, etc., and is particularly specific. It is a suspicious action to be taken. Therefore, in order to identify such suspicious behavior, for example, as shown in FIG. 3, an optical fiber 10A is laid along the border and crosses the border (that is, the optical fiber 10A) in the underground G. Detects suspicious behavior of moving to. FIG. 3 corresponds to a top view of the vicinity of the border as viewed from above. However, a gate for moving between neighboring countries is installed at the border, and as shown by the loci T2 and T3, there is also an action that people and cars pass through the gate, but this action is a regular route. It is an action to move, not a suspicious action. Therefore, in the underground G, as shown by the locus T1, the vibration pattern generated by the action of moving across the optical fiber 10A at a position without a gate is the vibration pattern of the suspicious action in the underground G. And.
[0030]
In the vicinity of the border, as shown by the trajectories T4 and T5, there is an action that the observer moves along the border (that is, the optical fiber 10A) to perform monitoring, but such an action is also a suspicious action. is not it.
[0031]
Alternatively, as the vibration pattern of the return light, a vibration pattern of normal vibration in the ground G (hereinafter, appropriately referred to as a vibration pattern in the normal state in the ground G) is stored in advance in a storage unit (not shown). You may stay. It should be noted that a plurality of vibration patterns in the normal state in the underground G may be stored in the storage unit. When specifying the suspicious behavior in the ground G, the specifying unit 22 compares the vibration pattern of the return light with the vibration pattern in the normal state in the ground G, which is stored in advance. Then, the specific unit 22 may determine that a suspicious behavior has occurred when the vibration pattern of the return light is different from any of the vibration patterns in the normal state in the ground G. Further, the specific unit 22 may determine that a suspicious behavior has occurred when a vibration pattern that does not match the vibration pattern in the normal state in the underground G is detected repeatedly or a plurality of times.
[0032]
Subsequently, with reference to FIG. 4, an operation example of the optical fiber sensing system according to the first embodiment will be described.
As shown in FIG. 4, the optical fiber 10A detects vibration in the underground G (step S11). The vibration detected by the optical fiber 10A is superimposed on the return light transmitted through the optical fiber 10A.
[0033]
Subsequently, the acquisition unit 21 acquires the return light on which the vibration detected by the optical fiber 10A is superimposed from the optical fiber 10A (step S12).
After that, the specifying unit 22 identifies the suspicious behavior in the underground G based on the vibration pattern of the return light acquired by the acquiring unit 21 (step S13).
[0034]
As described above, according to the first embodiment, the optical fiber 10A detects the vibration in the underground G. The acquisition unit 21 acquires the return light on which the vibration detected by the optical fiber 10A is superimposed from the optical fiber 10A. The identification unit 22 identifies a suspicious behavior in the underground G based on the vibration pattern of the return light acquired by the acquisition unit 21.
[0035]
Therefore, suspicious behavior such as tunnel excavation in underground G can be detected. Further, the optical fiber 10A is inexpensive and can be easily laid in the underground G over a wide range. Therefore, suspicious behavior in the underground G can be detected inexpensively in a wide-area monitoring area such as a border.
[0036]

Subsequently, with reference to FIG. 5, a configuration example of the optical fiber sensing system according to the second embodiment will be described.
[0037]
As shown in FIG. 5, in the optical fiber sensing system according to the second embodiment, the storage unit 23 is added to the optical fiber sensing device 20 as compared with the configuration of FIG. 1 of the first embodiment described above. The point is different.
[0038]
The storage unit 23 stores in advance the vibration pattern of the vibration generated when the suspicious behavior occurs in the ground G (the vibration pattern of the suspicious behavior in the ground G) as the vibration pattern of the return light. The storage unit 23 may store the vibration patterns of a plurality of suspicious behaviors in the underground G. Further, the vibration pattern of the suspicious behavior in the underground G may be learned by the specific unit 22 or the learning unit (not shown) by machine learning or the like.
[0039]
Further, as the vibration pattern of the return light, the storage unit 23 previously preliminarily sets a vibration pattern of vibration generated when the underground G is in the normal state (hereinafter, appropriately referred to as a vibration pattern in the normal state in the ground G). Remember. The vibration that occurs when the underground G is in a normal state is, for example, the vibration of the subway running in the underground G, the vibration of the sewerage pipes provided in the underground G, or the vibration of a person walking on the ground. Vibration, vibration of a car running on the ground, vibration of temporary construction work, etc. The storage unit 23 may store a plurality of vibration patterns in the normal state in the underground G. Further, the vibration pattern in the normal state in the underground G may be one learned by the specific unit 22 or the learning unit (not shown) by machine learning or the like.
[0040]
In the second embodiment, in the specific unit 22, the vibration pattern of the return light acquired by the acquisition unit 21 is different from the vibration pattern in the normal state in the ground G, and the vibration pattern of the suspicious behavior in the ground G. If it matches, it is determined that a suspicious behavior corresponding to the matching vibration pattern has occurred in the underground G.
Alternatively, if the vibration pattern of the return light acquired by the acquisition unit 21 is different from the vibration pattern in the normal state in the underground G, the specific unit 22 determines that a suspicious behavior has occurred in the underground G.
[0041]
Subsequently, with reference to FIG. 6, an operation example of the optical fiber sensing system according to the second embodiment will be described.
As shown in FIG. 6, first, steps S21 and S22 similar to steps S11 and S12 according to the above-described first embodiment shown in FIG. 4 are performed.
Subsequently, the specific unit 22 stores the vibration pattern of the return light acquired by the acquisition unit 21 in advance in the storage unit 23, which is the vibration pattern of the suspicious behavior in the ground G and the vibration in the normal state in the ground G. Compare with each pattern (step S23).
Then, the specific unit 22 determines whether or not a suspicious action has occurred in the underground G based on the comparison result of step S23 (step S24).
[0042]
For example, when the vibration pattern of the return light is different from any of the vibration patterns in the normal state in the ground G and matches any of the vibration patterns of the suspicious behavior in the ground G, the specific unit 22 has the ground G. In, it is determined that a suspicious behavior corresponding to the matching vibration pattern has occurred.
[0043]
Alternatively, if the vibration pattern of the return light is different from any of the vibration patterns in the normal state in the ground G, the specific unit 22 determines that a suspicious behavior has occurred in the ground G.
[0044]
As described above, according to the second embodiment, the storage unit 23 stores in advance the vibration pattern of the suspicious behavior in the ground G and the vibration pattern in the normal state as the vibration pattern of the return light. When the vibration pattern of the return light acquired by the acquisition unit 21 is different from the vibration pattern in the normal state in the ground G and matches the vibration pattern of the suspicious behavior in the ground G, the specific unit 22 is the underground G. In, it is determined that a suspicious behavior corresponding to the matching vibration pattern has occurred. Alternatively, when the vibration pattern of the return light is different from the vibration pattern in the normal state in the ground G, the specific unit 22 determines that a suspicious behavior has occurred in the ground G.
[0045]
In the underground G, for example, vibration of the subway may occur even when it is in a normal state. According to the second embodiment, the vibration when the underground G is in the normal state is stored in advance, and when the vibration occurs, the specific unit 22 indicates that the suspicious behavior has occurred in the underground G. Do not judge. As a result, it is possible to improve the accuracy of identifying suspicious behavior in the underground G. Other effects are the same as those in the first embodiment described above.
[0046]

Subsequently, a configuration example of the optical fiber sensing system according to the third embodiment will be described with reference to FIG. 7.
[0047]
As shown in FIG. 7, the optical fiber sensing system according to the third embodiment has an additional optical fiber 10B and an optical fiber as compared with the configuration of FIG. 1 of the first embodiment described above. The difference is that the storage unit 23 is added to the sensing device 20.
[0048]
The optical fiber 10B is provided on the ground in the monitoring area, and one end thereof is connected to the optical fiber sensing device 20. Specifically, the optical fiber 10B is laid on the fence F provided in the monitoring area.
[0049]
That is, in the third embodiment, the optical fiber 10A is provided in the underground G of the monitoring area, and the optical fiber 10B is provided on the ground of the monitoring area. However, the present invention is not limited to this, and the optical fibers 10A and 10B may be composed of one optical fiber, at least a part of the one optical fiber may be provided in the underground G, and the rest may be provided on the ground. good.
[0050]
Further, the optical fiber 10B is laid linearly along the fence F. However, the present invention is not limited to this, and the optical fiber 10B may be arranged so as to meander in a curved shape in a plane horizontal to the main surface (the surface having the largest area) of the fence F.
[0051]
Further, the optical fiber 10B is stored inside the cable P provided in the fence F. However, the present invention is not limited to this, and the optical fiber 10B may be attached to or wound around the outer peripheral surface of the cable P, or may be arranged in such a manner that the cable P is not used.
[0052]
The storage unit 23 has the same function as the storage unit 23 according to the second embodiment described above.
However, in the third embodiment, if the storage unit 23 stores at least one of the vibration pattern of the suspicious behavior in the ground G and the vibration pattern of the suspicious behavior in the ground G as the vibration pattern of the return light. Well, you don't necessarily have to remember both.
[0053]
In the third embodiment, the acquisition unit 21 not only incidents the pulsed light on the optical fiber 10A and acquires (receives) the return light on which the vibration detected by the optical fiber 10A is superimposed from the optical fiber 10A. The pulsed light is incident on the optical fiber 10B, and the return light on which the vibration detected by the optical fiber 10B is superimposed is acquired (received) from the optical fiber 10B.
[0054]
In the third embodiment, the specific unit 22 has a vibration pattern of the return light acquired by the acquisition unit 21 from the optical fiber 10A provided in the ground G (hereinafter, appropriately, vibration of the return light in the ground G). The vibration intensity is higher than the vibration pattern of the return light acquired from the optical fiber 10B provided on the ground by the acquisition unit 21 (hereinafter, appropriately referred to as the vibration pattern of the return light on the ground). If it is large and matches the vibration pattern of the suspicious behavior in the ground G, it is determined that the suspicious behavior corresponding to the matching vibration pattern has occurred in the ground G.
[0055]
Alternatively, the storage unit 23 has a vibration pattern of the return light.The vibration pattern of the vibration generated when the ground is in the normal state (hereinafter, appropriately referred to as the vibration pattern in the normal state on the ground) is stored in advance. The vibration generated when the ground is in a normal state is, for example, the vibration of a person walking on the ground, the vibration of a car traveling on the ground, or the like. Therefore, as shown in FIG. 3, in the vicinity of the border, vibrations of people and vehicles passing through the gate on the ground (trajectories T2, T3) and vibrations of guards moving along the borders on the ground (trajectories T4, T5). ) Is also a vibration that occurs when the ground is in a normal state. The storage unit 23 may store a plurality of vibration patterns in a normal state on the ground. In the specific unit 22, the vibration pattern of the return light on the ground is different from the vibration pattern in the normal state on the ground, and the vibration pattern of the return light in the ground G matches the vibration pattern of the suspicious behavior in the ground G. If so, it is determined that a suspicious behavior corresponding to the matching vibration pattern has occurred in the underground G. On the other hand, in the specific unit 22, even if the vibration pattern of the return light in the ground G matches the vibration pattern of the suspicious behavior in the ground G, the vibration pattern of the return light on the ground is the vibration in the normal state on the ground. If it matches the pattern, it is determined that no suspicious behavior has occurred in the underground G.
[0056]
Subsequently, with reference to FIG. 8, an operation example of the optical fiber sensing system according to the third embodiment will be described.
As shown in FIG. 8, first, the optical fiber 10A provided in the ground G and the optical fiber 10B provided on the ground detect the vibration in the ground G (step S31). The vibration detected by the optical fiber 10A is superimposed on the return light transmitted through the optical fiber 10A, and the vibration detected by the optical fiber 10B is superimposed on the return light transmitted through the optical fiber 10B.
[0057]
Subsequently, the acquisition unit 21 acquires the return light on which the vibration detected by the optical fiber 10A is superimposed from the optical fiber 10A provided in the ground G, and the optical fiber from the optical fiber 10B provided on the ground. The return light on which the vibration detected by 10B is superimposed is acquired (step S32).
[0058]
Subsequently, the specific unit 22 obtains a vibration pattern (vibration pattern of the return light in the ground G) acquired by the acquisition unit 21 from the optical fiber 10A provided in the underground G, and the acquisition unit 21 acquires the vibration pattern on the ground. It is compared with the vibration pattern (vibration pattern of the return light on the ground) of the return light acquired from the optical fiber 10B provided in the above. Alternatively, the specific unit 22 compares the vibration pattern of the return light on the ground with the vibration pattern in the normal state on the ground stored in advance in the storage unit 23 (step S33).
[0059]
Further, the specific unit 22 compares the vibration pattern of the return light in the ground G with the vibration pattern of the suspicious behavior in the ground G or the vibration pattern in the normal state in the ground G stored in advance in the storage unit 23. (Step S34).
Then, the specific unit 22 determines whether or not a suspicious behavior has occurred based on the comparison results of steps S33 and S34 (step S35).
[0060]
For example, in the specific unit 22, the vibration pattern of the return light in the ground G has a higher vibration intensity than the vibration pattern of the return light on the ground, and the vibration pattern of the return light in the ground G has a vibration pattern. However, if it matches any of the vibration patterns of the suspicious behavior in the underground G, it is determined that the suspicious behavior corresponding to the matching vibration pattern has occurred in the underground G.
[0061]
Alternatively, in the specific unit 22, the vibration pattern of the return light in the ground G has a higher vibration intensity than the vibration pattern of the return light on the ground, and the vibration pattern of the return light in the ground G has. However, if it is different from any of the vibration patterns in the normal state in the underground G, it is determined that a suspicious behavior has occurred in the underground G.
[0062]
Alternatively, in the specific unit 22, the vibration pattern of the return light on the ground is different from any of the vibration patterns in the normal state on the ground, and the vibration pattern of the return light in the ground G is a suspicious behavior in the ground G. If it matches the vibration pattern, it is determined that a suspicious behavior corresponding to the matching vibration pattern has occurred in the underground G.
[0063]
Alternatively, in the specific unit 22, the vibration pattern of the return light on the ground is different from any of the vibration patterns in the normal state on the ground, and the vibration pattern of the return light in the ground G is in the normal state in the ground G. If it is different from any of the vibration patterns, it is determined that a suspicious behavior has occurred in the underground G.
[0064]
As described above, according to the third embodiment, the optical fiber 10A is provided in the underground G and the optical fiber 10B is provided on the ground. The storage unit 23 stores the vibration pattern of the suspicious behavior in the ground G or the vibration pattern in the normal state in the ground G as the vibration pattern of the return light, and also stores the vibration pattern in the normal state on the ground in advance. When the vibration pattern of the return light in the ground G is larger than the vibration pattern of the return light on the ground and matches the vibration pattern of the suspicious behavior in the ground G, the specific unit 22 has a vibration pattern. It is determined that a suspicious behavior corresponding to the matching vibration pattern has occurred in the underground G. Alternatively, in the specific unit 22, the vibration pattern of the return light in the ground G has a higher vibration intensity than the vibration pattern of the return light on the ground, and the vibration pattern of the return light in the ground G has. However, if it is different from the vibration pattern in the normal state in the underground G, it is determined that a suspicious behavior has occurred in the underground G. Alternatively, in the specific unit 22, the vibration pattern of the return light on the ground is different from the vibration pattern in the normal state on the ground, and the vibration pattern of the return light in the ground G is the vibration pattern of the suspicious behavior in the ground G. If it matches, it is determined that a suspicious behavior corresponding to the matching vibration pattern has occurred in the underground G. Alternatively, in the specific unit 22, the vibration pattern of the return light on the ground is different from the vibration pattern in the normal state on the ground, and the vibration pattern of the return light in the ground G is the vibration pattern in the normal state in the ground G. If it is different from, it is judged that a suspicious action has occurred in the underground G.
[0065]
For example, the suspicious behavior of excavating a tunnel can occur not only in the underground G but also on the ground. According to the third embodiment, when a suspicious behavior of tunnel excavation occurs on the ground, the vibration pattern of the return light in the ground G has a higher vibration intensity than the vibration pattern of the return light on the ground. growing. In this case, the specific unit 22 does not determine that the suspicious behavior has occurred in the underground G. Alternatively, when the vibration pattern of the return light on the ground matches the vibration pattern in the normal state on the ground, the specific unit 22 does not determine that a suspicious behavior has occurred in the underground G. As a result, it is possible to improve the accuracy of identifying suspicious behavior in the underground G. Other effects are the same as those in the first embodiment described above.
[0066]

Subsequently, with reference to FIG. 9, a configuration example of the optical fiber sensing system according to the fourth embodiment will be described.
[0067]
As shown in FIG. 9, the optical fiber sensing system according to the fourth embodiment has an additional camera 30 and optical fiber sensing as compared with the configuration of FIG. 1 of the first embodiment described above. The difference is that the storage unit 23, the image acquisition unit 24, and the image processing unit 25 are added to the device 20. Although only one camera 30 is provided in FIG. 9, a plurality of cameras 30 may be provided.
[0068]
The camera 30 is a camera capable of photographing at least a part of the ground portion of the surveillance area, and is realized by, for example, a fixed camera, a PTZ (Pan Tilt Zoom) camera, or the like. As will be described later, the camera 30 is used to confirm from the camera image whether or not the suspicious behavior corresponding to the suspicious behavior in the underground G is occurring on the ground. Therefore, the image quality of the camera 30 may be such that it can be confirmed whether or not suspicious behavior has occurred on the ground. Further, the camera 30 may be a dedicated camera for monitoring the vicinity of the fence F, or a camera installed in the city may be used as the camera 30.
[0069]
The image acquisition unit 24 acquires a camera image taken by the camera 30. Specifically, when the acquisition unit 21 acquires the return light on which the vibration whose vibration pattern matches the suspicious behavior in the ground G is superimposed, the image acquisition unit 24 is located at the position on the optical fiber 10A where the vibration is detected. The camera 30 is controlled so as to capture the image, and the camera image captured by the camera 30 at that time is acquired. For example, the image acquisition unit 24 has an angle of the camera 30 (so as to face the corresponding position or the direction of the corresponding position on the optical fiber 10A, or to take a wide-angle image of the area including the corresponding position on the optical fiber 10A. Azimuth, elevation), zoom magnification, etc. are controlled.
[0070]
In addition, in order to acquire the camera image as described above, in addition to the process of specifying the position on the optical fiber 10A where the vibration whose vibration pattern matches the suspicious behavior in the ground G is detected, on the specified optical fiber 10A. A process of converting the position to the position on the camera image is required. Regarding the position on the optical fiber 10A, as described above, the time difference between the time when the specific unit 22 incidents the pulsed light on the optical fiber 10A and the time when the return light on which the vibration is superimposed is received from the optical fiber 10A. It may be specified based on. Regarding the position conversion, for example, the image acquisition unit 24 holds in advance a correspondence table for associating the distance of the optical fiber 10A from the acquisition unit 21 with the camera coordinates, and the position conversion described above is performed using this correspondence table. You may do. Further, the image acquisition unit 24 may acquire camera images from each of the plurality of cameras 30 as long as the corresponding position on the optical fiber 10A can be photographed by the plurality of cameras 30.
[0071]
The image processing unit 25 recognizes the camera image acquired by the image acquisition unit 24, and detects suspicious behavior on the ground from the result of the image recognition. The suspicious action on the ground is an action corresponding to the suspicious action in the underground G specified by the specific unit 22. For example, when the specific unit 22 specifies a suspicious behavior of excavating a tunnel in the ground G, the image processing unit 25 detects the suspicious behavior of excavating a tunnel on the ground.
[0072]
The storage unit 23 has the same function as the storage unit 23 according to the second embodiment described above.
However, in the fourth embodiment, if the storage unit 23 stores at least one of the vibration pattern of the suspicious behavior in the ground G and the vibration pattern in the normal state in the ground G as the vibration pattern of the return light. Well, you don't necessarily have to remember both.
[0073]
In the fourth embodiment, in the specific unit 22, the vibration pattern of the return light acquired by the acquisition unit 21 matches the vibration pattern of the suspicious behavior in the ground G, and the image processing unit 25 uses the camera image. If the suspicious behavior on the ground cannot be detected, it is determined that the suspicious behavior corresponding to the matching vibration pattern has occurred in the underground G.
[0074]
Subsequently, with reference to FIG. 10, an operation example of the optical fiber sensing system according to the fourth embodiment will be described.
As shown in FIG. 10, first, steps S41 and S42 similar to steps S11 and S12 according to the above-described first embodiment shown in FIG. 4 are performed.
[0075]
Subsequently, the specific unit 22 stores the vibration pattern of the return light acquired by the acquisition unit 21 in advance in the storage unit 23, which is the vibration pattern of the suspicious behavior in the ground G or the vibration in the normal state in the ground G. Compare with the pattern (step S43).
[0076]
Then, the specific unit 22 determines whether or not a suspicious behavior may have occurred based on the comparison result of step S43 (step S44). For example, when the vibration pattern of the return light matches any of the vibration patterns of suspicious behavior in the ground G, or when the vibration pattern is positive in the ground G.If it is different from any of the vibration patterns in the normal state, it is judged that suspicious behavior may have occurred.
[0077]
When there is a possibility that a suspicious behavior has occurred (Yes in step S44), the image acquisition unit 24 subsequently captures a position on the optical fiber 10A where the vibration whose vibration pattern matches the suspicious behavior is detected. The camera 30 is controlled to acquire a camera image. Then, the image processing unit 25 detects suspicious behavior on the ground from the camera image acquired by the image acquisition unit 24 (step S45).
[0078]
When the image processing unit 25 can detect the suspicious behavior on the ground (Yes in step S46), the specific unit 22 determines that the suspicious behavior has occurred on the ground and ends the processing.
On the other hand, when the image processing unit 25 could not detect the suspicious behavior on the ground (No in step S46), the specific unit 22 said that the suspicious behavior corresponding to the vibration pattern matched in step S44 occurred in the underground G. Judgment (step S47).
[0079]
As described above, according to the fourth embodiment, the camera 30 capable of photographing the ground is provided. The storage unit 23 stores in advance the vibration pattern of the suspicious behavior in the ground G or the vibration pattern in the normal state in the ground G as the vibration pattern of the return light. In the specific unit 22, the vibration pattern of the return light matches the vibration pattern of the suspicious behavior in the ground G, or is different from the vibration pattern in the normal state in the ground G, and the image processing unit 25 is on the ground. If the suspicious behavior cannot be detected, it is determined that the suspicious behavior has occurred in the underground G.
[0080] [0080]
For example, the suspicious behavior of excavating a tunnel can occur not only in the underground G but also on the ground. According to the fourth embodiment, when a suspicious behavior of tunnel excavation occurs on the ground, the suspicious behavior is detected by the image processing unit 25. In this case, the specific unit 22 does not determine that the suspicious behavior has occurred in the underground G. As a result, it is possible to improve the accuracy of identifying suspicious behavior in the underground G. Other effects are the same as those in the first embodiment described above.
[0081]

Subsequently, with reference to FIG. 11, a configuration example of the optical fiber sensing system according to the fifth embodiment will be described.
[0082]
As shown in FIG. 11, the optical fiber sensing system according to the fourth embodiment has two optical fibers 10A1 instead of the optical fiber 10A as compared with the configuration of FIG. 1 of the above-described first embodiment. , 10A2 is added, and the storage unit 23 and the position specifying unit 26 are added to the optical fiber sensing device 20.
[0083]
The optical fibers 10A1 and 10A2 are provided in the underground G of the monitoring area, and one end thereof is connected to the optical fiber sensing device 20.
Further, the optical fibers 10A1 and 10A2 are arranged in the ground G in a plane substantially horizontal to the ground, parallel to each other, and linearly along the fence F. Further, the optical fiber 10A1 is arranged in the vicinity of the fence F, and the optical fiber 10A2 is arranged at a position separated from the optical fiber 10A1 by a predetermined distance in the direction away from the fence F.
[0084]
The storage unit 23 has the same function as the storage unit 23 according to the second embodiment described above.
However, in the fifth embodiment, the storage unit 23 may store the vibration pattern of the suspicious behavior in the ground G as the vibration pattern of the return light, and the vibration pattern in the normal state in the ground G may be stored. You don't have to remember it.
[0085]
In the fifth embodiment, the acquisition unit 21 incidents pulsed light on the optical fiber 10A1, acquires (receives) the return light on which the vibration detected by the optical fiber 10A1 is superimposed from the optical fiber 10A1, and also obtains (receives) the light. Pulsed light is incident on the fiber 10A2, and the return light on which the vibration detected by the optical fiber 10A2 is superimposed is acquired (received) from the optical fiber 10A2.
[0086]
In the fifth embodiment, in the specific unit 22, the vibration pattern of the return light acquired by the acquisition unit 21 from the optical fiber 10A1 or the vibration pattern of the return light acquired by the acquisition unit 21 from the optical fiber 10A2 is in the ground. If it matches the vibration pattern of the suspicious behavior in G, it is determined that the suspicious behavior corresponding to the matching vibration pattern has occurred in the underground G.
[0087]
When the position specifying unit 26 determines that the suspicious behavior has occurred in the ground G, the position specifying unit 26 identifies the position where the suspicious behavior has occurred based on the vibration pattern of the return light acquired by the acquisition unit 21. do.
[0088]
Here, with reference to FIGS. 12 and 13, an example of a method of specifying the position where the suspicious behavior occurs in the position specifying unit 26 will be described.
[0089]
In the example of FIG. 12, first, the position specifying unit 26 is located at one point on the optical fiber 10A1 from the positions on the optical fibers 10A1 and 10A2 where the vibration in which the suspicious behavior in the ground G and the vibration pattern match is detected. Along with selecting a sensing point, one sensing point on the optical fiber 10A2 is selected. Here, the sensing point S1 on the optical fiber 10A1 and the sensing point S2 on the optical fiber 10A2 are selected. Then, the position specifying unit 26 analyzes the distribution of the vibration detected at the two sensing points S1 and S2 (the intensity of the detected vibration and the time when the vibration is detected), and 2 from the analyzed vibration distribution. The vibration intensity difference and time difference detected at the point sensing points S1 and S2 are derived, and the position where the suspicious behavior occurs is estimated based on the derived intensity difference and time difference. Here, the position where the suspicious behavior occurs is estimated to be any position on the line P12. Subsequently, the position specifying unit 26 selects one sensing point on the optical fiber 10A1 and selects one sensing point on the optical fiber 10A2 so that the combination is different from the two points selected above. select. Here, the sensing point S3 on the optical fiber 10A1 and the sensing point S2 on the optical fiber 10A2 are selected. Then, the position specifying unit 26 estimates the position where the suspicious behavior occurs from the vibration distribution (intensity and time) detected at the two sensing points S2 and S3 in the same manner as described above. Here, the position where the suspicious behavior occurs is estimated to be any position on the line P23. Then, the position specifying unit 26 identifies the position where the line P12 and the line P23 intersect as the position where the suspicious behavior occurs.
[0090]
In the example of FIG. 13, first, the position specifying unit 26 is located at one point on the optical fiber 10A1 from the positions on the optical fibers 10A1 and 10A2 where the vibration in which the suspicious behavior in the ground G and the vibration pattern match is detected. Along with selecting a sensing point, one sensing point on the optical fiber 10A2 is selected. Here, the sensing point S1 on the optical fiber 10A1 and the sensing point S2 on the optical fiber 10A2 are selected. Then, the position specifying unit 26 analyzes the distribution of the vibration detected at the two sensing points S1 and S2 (the intensity of the detected vibration and the time when the vibration is detected), and 2 from the analyzed vibration distribution. The intensity difference and time difference of the vibration detected at the sensing points S1 and S2 of the points are derived. For example, when a suspicious behavior occurs in the area A, the sensing point S1 detects the vibration corresponding to the suspicious behavior earlier than the sensing point S2, and the intensity of the detected vibration is also increased. Therefore, when such detection is performed at the sensing points S1 and S2, the position specifying unit 26 identifies the area A as the position where the suspicious behavior occurs. Further, when a suspicious behavior occurs in the area B, the sensing point S2 detects the vibration corresponding to the suspicious behavior earlier than the sensing point S1, and the intensity of the detected vibration is also increased. Therefore, when such detection is performed at the sensing points S1 and S2, the position specifying unit 26 identifies the area B as the position where the suspicious behavior occurs.
[0091]
Note that the method of specifying the position where the suspicious behavior occurs shown in FIGS. 12 and 13 is an example and is not limited to this.
Further, if the sensing point is selected as shown in FIGS. 12 and 13, the position where the suspicious behavior occurs can be specified. Therefore, it is not always necessary to provide two optical fibers 10A1 and 10A2, and one optical fiber may be arranged so as to pass through a sensing point as shown in FIGS. 12 and 13. In this case, one optical fiber may be arranged so as to meander in a curved line in a plane substantially horizontal to the ground in the underground G.
[0092]
Also, in the case of tunnel excavation, it is possible that the position where suspicious behavior occurs will change as the excavation progresses. Therefore, when the vibration pattern corresponding to the excavation sound (or simply the abnormal vibration pattern) approaches continuously and periodically, it may be determined to be abnormal. At that time, the direction or area of ​​the exit of the tunnel may be specified from the change in the position of the source of the approaching sound. Further, the vibration pattern may be detected at regular intervals (for example, every day), and the generation position and direction may be specified from the change in the intensity and time of the approaching sound.
[0093]
Subsequently, with reference to FIG. 14, an operation example of the optical fiber sensing system according to the fifth embodiment will be described.
As shown in FIG. 14, first, the optical fibers 10A1 and 10A2 detect the vibration in the underground G (step S51). The vibration detected by the optical fiber 10A1 is superimposed on the return light transmitted through the optical fiber 10A1, and the vibration detected by the optical fiber 10A2 is superimposed on the return light transmitted through the optical fiber 10A2.
[0094]
Subsequently, the acquisition unit 21 acquires the return light on which the vibration detected by the optical fiber 10A1 is superimposed from the optical fiber 10A1, and also acquires the return light on which the vibration detected by the optical fiber 10A2 is superimposed from the optical fiber 10A2. Acquire (step S52).
[0095]
Subsequently, the specific unit 22 stores the vibration pattern of the return light acquired from the optical fibers 10A1 and 10A2 by the acquisition unit 21 in advance in the storage unit 23, and the vibration pattern of the suspicious behavior in the ground G or the ground. It is compared with the vibration pattern in the normal state in G (step S53).
[0096]
Then, the specific unit 22 determines whether or not a suspicious behavior has occurred based on the comparison result of step S53 (step S54).
For example, if any of the vibration patterns of the return light acquired by the acquisition unit 21 from the optical fibers 10A1 and 10A2 matches any of the vibration patterns of the suspicious behavior in the ground G, the specific unit 22 will be in the ground G. , Identify that a suspicious behavior corresponding to the matched vibration pattern has occurred.
[0097]
Alternatively, when any of the vibration patterns of the return light acquired by the acquisition unit 21 from the optical fibers 10A1 and 10A2 is different from any of the vibration patterns in the normal state in the underground G, the specific unit 22 determines in the underground G. Identify that suspicious behavior has occurred.
[0098]
After that, the position specifying unit 26 identifies the position where the suspicious behavior occurs in the underground G based on the vibration pattern of the return light acquired by the acquisition unit 21 (step S55).
[0099]
As described above, according to the fifth embodiment, when the specific unit 22 determines that the suspicious behavior has occurred in the underground G, the position specifying unit 26 is based on the vibration pattern of the return light. Identify the location of the suspicious behavior in. Thereby, not only the suspicious behavior such as tunnel excavation in the underground G can be detected, but also the suspicious behavior occurrence position can be specified even if the suspicious behavior occurrence position is located away from the optical fiber 10. In addition, the direction of the position where the suspicious behavior occurs can be specified. Other effects are the same as those in the first embodiment described above.
[0100]

As shown in FIG. 15, the optical fiber sensing device 20 may include an estimation unit 27 for estimating the exit position of the tunnel when it is determined that tunnel excavation has occurred as a suspicious behavior in the underground G. ..
[0101]
For example, the estimation unit 27 has a position feature in the above-described fifth embodiment.A concentric circle separated by a predetermined distance from the tunnel excavation occurrence position specified by the fixed portion 26 may be estimated as the tunnel exit position.
[0102]
In addition, it is highly likely that an abandoned house or a place with pipes such as water pipes will be selected as the exit of the tunnel. Therefore, the estimation unit 27 refers to the map information, and if there is an abandoned house or a place where there is a pipe near the tunnel excavation occurrence position specified by the position identification unit 26, the estimation unit 27 estimates that place as the exit position of the tunnel. May be.
[0103]
Further, the estimation unit 27 also acquires return light from an optical fiber other than the optical fiber used in each of the above-described embodiments (for example, an optical fiber located at a position away from the monitoring area), and uses the acquired return light. Further use may be used to estimate the exit position of the tunnel.
[0104]
Further, the position specifying unit 26 repeatedly identifies the position where the tunnel excavation occurs in the above-described fifth embodiment, and the estimation unit 27 estimates the exit position of the tunnel based on the time-series change in the position where the tunnel excavation occurs. You may.
[0105]
Further, when it is determined that the suspicious behavior in the underground G is to move in the existing pipe, carry an object in the existing pipe, or the like, the position specifying unit 26 is the position where the existing pipe is laid. Alternatively, the exit may be specified. At that time, the position specifying unit 26 may specify the position or the exit where the existing pipe is laid in cooperation with the map.
[0106]
Further, when the specific unit 22 identifies a suspicious behavior in the underground G, the specific unit 22 may set a suspicious level. For example, when tunnel excavation is specified as a suspicious behavior, there is a possibility that a large number of people are excavating if the vibration intensity is high. Further, if the duration of vibration is long, there is a possibility that excavation work is performed using a machine tool such as a drill. Therefore, the optical fiber sensing device 20 may set a high suspicious level when the vibration intensity is high or the vibration duration is long.
[0107]
Further, as shown in FIG. 16, in the optical fiber sensing device 20, when the suspicious level is equal to or higher than the threshold value, the position where the tunnel excavation occurs specified by the position specifying unit 26 or the exit of the tunnel estimated by the estimation unit 27. A notification unit 28 for notifying the dispatch of a person or a drone may be provided at the position. The notification destination may be, for example, a monitoring system for monitoring the monitored area, a monitoring room, or the like. Further, the notification method may be, for example, a method of displaying a GUI (Graphical User Interface) screen on the display or monitor of the notification destination, or a method of outputting a message by voice from the speaker of the notification destination.
[0108]
Further, when the identification unit 22 identifies the suspicious behavior in the underground G, the notification unit 28 indicates the position where the tunnel excavation occurs, which is specified by the position identification unit 26, or the tunnel estimated by the estimation unit 27, regardless of the suspicious level. The exit position may be notified. The notification destination and notification method may be the same as described above. At this time, the notification unit 28 may display the tunnel excavation occurrence position and the tunnel exit position on the map when the notification is performed on the GUI screen. An example thereof is shown in FIG.
[0109]
Further, the optical fiber sensing device 20 is assumed to be installed in the underground G, but the present invention is not limited to this, and the optical fiber sensing device 20 may be installed on the ground.
Further, in the examples of FIGS. 1, 5, 7, 9, 9, 11, 15, and 16, the optical fiber sensing device 20 has a plurality of components (acquisition unit 21, identification unit 22, storage unit 23, The image acquisition unit 24, the image processing unit 25, the position specifying unit 26, the estimation unit 27, and the notification unit 28) are provided, but the present invention is not limited thereto. The components provided in the optical fiber sensing device 20 are not limited to being provided in one device, and may be distributed in a plurality of devices.
[0110]

Subsequently, with reference to FIG. 18, the hardware configuration of the computer 40 that realizes the optical fiber sensing device 20 will be described.
[0111]
As shown in FIG. 18, the computer 40 includes a processor 401, a memory 402, a storage 403, an input / output interface (input / output I / F) 404, a communication interface (communication I / F) 405, and the like. The processor 401, the memory 402, the storage 403, the input / output interface 404, and the communication interface 405 are connected by a data transmission line for transmitting and receiving data to and from each other.
[0112]
The processor 401 is, for example, an arithmetic processing unit such as a CPU (Central Processing Unit) or a GPU (Graphics Processing Unit). The memory 402 is, for example, a memory such as a RAM (Random Access Memory) or a ROM (Read Only Memory). The storage 403 is, for example, a storage device such as an HDD (Hard Disk Drive), an SSD (Solid State Drive), or a memory card. Further, the storage 403 may be a memory such as a RAM or a ROM.
[0113]
The storage 403 realizes the functions of the components (acquisition unit 21, identification unit 22, image acquisition unit 24, image processing unit 25, position identification unit 26, estimation unit 27, and notification unit 28) included in the optical fiber sensing device 20. I remember the program to do. By executing each of these programs, the processor 401 realizes the functions of the components included in the optical fiber sensing device 20. Here, when executing each of the above programs, the processor 401 may read these programs onto the memory 402 and then execute the programs, or may execute the programs without reading them onto the memory 402. In addition to the role of the storage unit 23, the memory 402 and the storage 403 also play a role of storing information and data held by other components included in the optical fiber sensing device 20.
[0114]
Further, the above-mentioned program can be stored by using various types of non-transitory computer readable medium and supplied to a computer (including a computer 40). Non-temporary computer-readable media include various types of tangible storage media. Examples of non-temporary computer readable media include magnetic recording media (eg, flexible discs, magnetic tapes, hard disk drives), optomagnetic recording media (eg, optomagnetic discs), CD-ROMs (Compact Disc-ROMs), CDs. -R (CD-Recordable), CD-R / W (CD-ReWritable), semiconductor memory (for example, mask ROM, PROM (Programmable ROM), EPROM (Erasable PROM), flash ROM, RAM. , May be supplied to the computer by various types of transient computer readable media. Examples of transient computer readable media include electrical, optical, and electromagnetic waves. The computer-readable medium can supply the program to the computer via a wired communication path such as an electric wire and an optical fiber, or a wireless communication path.
[0115]
The input / output interface 404 is connected to a display device 4041, an input device 4042, a sound output device 4043, and the like. The display device 4041 is a device that displays a screen corresponding to drawing data processed by the processor 401, such as an LCD (Liquid Crystal Display), a CRT (Cathode Ray Tube) display, and a monitor. The input device 4042 is a device that receives an operator's operation input, and is, for example, a keyboard, a mouse, a touch sensor, and the like. The display device 4041 and the input device 4042 may be integrated and realized as a touch panel. The sound output device 4043 is a device such as a speaker that acoustically outputs sound corresponding to acoustic data processed by the processor 401.
[0116]
The communication interface 405 sends and receives data to and from an external device. For example, the communication interface 405 communicates with an external device via a wired communication path or a wireless communication path.
[0117]
Although the present disclosure has been described above with reference to the embodiments, the present disclosure is not limited to the above-described embodiments. Various changes that can be understood by those skilled in the art can be made to the structure and details of the present disclosure within the scope of the present disclosure.
[0118]
For example, the above-described embodiment may be used in combination in part or in whole. For example, the methods for identifying suspicious behavior in the underground G described in each of the above-described embodiments may be used in combination with each other.
[0119]
Further, a part or all of the above embodiments may be described as in the following appendix, but the present invention is not limited to the following.
(Appendix 1)
Optical fiber that detects vibration in the ground,
An acquisition unit that acquires an optical signal on which the vibration detected by the optical fiber is superimposed from the optical fiber, and
Based on the vibration pattern of the optical signal acquired by the acquisition unit, the specific unit that identifies suspicious behavior in the ground and the specific unit
Optical fiber sensing system equipped with.
(Appendix 2)
The specific unit determines that suspicious behavior has occurred in the ground when periodic vibration is detected in the vibration pattern of the optical signal and the intensity of the vibration gradually increases.
The optical fiber sensing system described in Appendix 1.
(Appendix 3)
Further equipped with a storage unit that stores in advance the vibration pattern of vibration that occurs when suspicious behavior occurs in the ground as the first vibration pattern.
When the vibration pattern of the optical signal acquired by the acquisition unit matches the first vibration pattern, the specific unit determines that a suspicious behavior corresponding to the first vibration pattern has occurred in the ground.
The optical fiber sensing system described in Appendix 1.
(Appendix 4)
The storage unit previously stores the vibration pattern of the vibration generated when the ground is in a normal state as the second vibration pattern.
When the vibration pattern of the optical signal acquired by the acquisition unit is different from the second vibration pattern and matches the first vibration pattern, the specific unit corresponds to the first vibration pattern in the ground. Judging that suspicious behavior has occurred,
The optical fiber sensing system described in Appendix 3.
(Appendix 5)
The optical fiber includes a first optical fiber arranged in the ground and a second optical fiber arranged on the ground.
The acquisition unit acquires an optical signal on which the vibration detected by the first optical fiber is superimposed from the first optical fiber, and superimposes the vibration detected by the second optical fiber on the second optical fiber. Get the optical signal
In the specific unit, the vibration pattern of the optical signal acquired by the acquisition unit from the first optical fiber is more vibrating than the vibration pattern of the optical signal acquired by the acquisition unit from the second optical fiber. When the intensity is high and the vibration pattern of the optical signal acquired by the acquisition unit from the first optical fiber matches the first vibration pattern, suspicious behavior corresponding to the first vibration pattern occurs in the ground. Judge that it has occurred,
The optical fiber sensing system described in Appendix 3.
(Appendix 6)
A camera that can shoot the ground and
The image acquisition unit that acquires the camera image taken by the camera, and
Further equipped with an image processing unit that detects suspicious behavior from the camera image,
The specific unit is the first vibration pattern in the ground when the vibration pattern of the optical signal acquired by the acquisition unit matches the first vibration pattern and the image processing unit cannot detect suspicious behavior. Judging that suspicious behavior corresponding to
The optical fiber sensing system described in Appendix 3.
(Appendix 7)
Based on the vibration pattern of the optical signal acquired by the acquisition unit, the suspicious behavior specified by the specific unit Further provided with a position specifying part for specifying the generation position,
The optical fiber sensing system according to any one of Supplementary note 1 to 6.
(Appendix 8)
An acquisition unit that acquires an optical signal on which the vibration detected by the optical fiber is superimposed from an optical fiber that detects vibration in the ground.
Based on the vibration pattern of the optical signal acquired by the acquisition unit, the specific unit that identifies suspicious behavior in the ground and the specific unit
Optical fiber sensing device equipped with.
(Appendix 9)
The specific unit determines that suspicious behavior has occurred in the ground when periodic vibration is detected in the vibration pattern of the optical signal and the intensity of the vibration gradually increases.
The optical fiber sensing device described in Appendix 8.
(Appendix 10)
Further equipped with a storage unit that stores in advance the vibration pattern of vibration that occurs when suspicious behavior occurs in the ground as the first vibration pattern.
When the vibration pattern of the optical signal acquired by the acquisition unit matches the first vibration pattern, the specific unit determines that a suspicious behavior corresponding to the first vibration pattern has occurred in the ground.
The optical fiber sensing device described in Appendix 8.
(Appendix 11)
The storage unit previously stores the vibration pattern of the vibration generated when the ground is in a normal state as the second vibration pattern.
When the vibration pattern of the optical signal acquired by the acquisition unit is different from the second vibration pattern and matches the first vibration pattern, the specific unit corresponds to the first vibration pattern in the ground. Judging that suspicious behavior has occurred,
The optical fiber sensing device according to Appendix 10.
(Appendix 12)
The optical fiber includes a first optical fiber arranged in the ground and a second optical fiber arranged on the ground.
The acquisition unit acquires an optical signal on which the vibration detected by the first optical fiber is superimposed from the first optical fiber, and superimposes the vibration detected by the second optical fiber on the second optical fiber. Get the optical signal
In the specific unit, the vibration pattern of the optical signal acquired by the acquisition unit from the first optical fiber is more vibrating than the vibration pattern of the optical signal acquired by the acquisition unit from the second optical fiber. When the intensity is high and the vibration pattern of the optical signal acquired by the acquisition unit from the first optical fiber matches the first vibration pattern, suspicious behavior corresponding to the first vibration pattern occurs in the ground. Judge that it has occurred,
The optical fiber sensing device according to Appendix 10.
(Appendix 13)
An image acquisition unit that acquires camera images taken with a camera that can shoot the ground,
Further equipped with an image processing unit that detects suspicious behavior from the camera image,
The specific unit is the first vibration pattern in the ground when the vibration pattern of the optical signal acquired by the acquisition unit matches the first vibration pattern and the image processing unit cannot detect suspicious behavior. Judging that suspicious behavior corresponding to
The optical fiber sensing device according to Appendix 10.
(Appendix 14)
Further provided with a position specifying unit that specifies the position where the suspicious behavior specified by the specific unit occurs based on the vibration pattern of the optical signal acquired by the acquiring unit.
The optical fiber sensing device according to any one of Supplementary note 8 to 13.
(Appendix 15)
It is an underground behavior monitoring method using an optical fiber sensing system.
The step that the optical fiber detects vibration in the ground,
The acquisition step of acquiring an optical signal on which the vibration detected by the optical fiber is superimposed from the optical fiber, and
A specific step to identify suspicious behavior in the ground based on the vibration pattern of the optical signal acquired in the acquisition step,
Underground behavior monitoring method including.
(Appendix 16)
In the specific step, when periodic vibration is detected in the vibration pattern of the optical signal and the intensity of the vibration gradually increases, it is determined that suspicious behavior has occurred in the ground.
The underground behavior monitoring method described in Appendix 15.
(Appendix 17)
Including a storage step in which the vibration pattern of vibration generated when a suspicious behavior occurs in the ground is stored in advance as the first vibration pattern.
In the specific step, when the vibration pattern of the optical signal acquired in the acquisition step matches the first vibration pattern, it is determined that a suspicious behavior corresponding to the first vibration pattern has occurred in the ground.
The underground behavior monitoring method described in Appendix 15.
(Appendix 18)
In the storage step, the vibration pattern of the vibration generated when the ground is in a normal state is stored in advance as the second vibration pattern.
In the specific step, when the vibration pattern of the optical signal acquired in the acquisition step is different from the second vibration pattern and matches the first vibration pattern, it corresponds to the first vibration pattern in the ground. Judging that suspicious behavior has occurred,
The underground behavior monitoring method described in Appendix 17.
(Appendix 19)
The optical fiber includes a first optical fiber arranged in the ground and a second optical fiber arranged on the ground.
In the acquisition step, an optical signal on which the vibration detected by the first optical fiber is superimposed is acquired from the first optical fiber, and the vibration detected by the second optical fiber is superimposed on the second optical fiber. Get the optical signal
In the specific step, the vibration pattern of the optical signal acquired from the first optical fiber in the acquisition step is more vibrating than the vibration pattern of the optical signal acquired from the second optical fiber in the acquisition step. When the intensity is high and the vibration pattern of the optical signal acquired from the first optical fiber in the acquisition step matches the first vibration pattern, suspicious behavior corresponding to the first vibration pattern occurs in the ground. Judge that it has occurred,
The underground behavior monitoring method described in Appendix 17.
(Appendix 20)
The image acquisition step to acquire the camera image taken by the camera that can shoot the ground, and
Further includes an image processing step of detecting suspicious behavior from the camera image,
In the specific step, when the vibration pattern of the optical signal acquired in the acquisition step matches the first vibration pattern and suspicious behavior cannot be detected in the image processing step, the first vibration pattern is found in the ground. Judging that suspicious behavior corresponding to
The underground behavior monitoring method described in Appendix 17.
(Appendix 21)
Further including a position specifying step for specifying the occurrence position of the suspicious behavior specified in the specific step based on the vibration pattern of the optical signal acquired in the acquisition step.
The underground behavior monitoring method described in any one of Appendix 15 to 20.
Code description
[0120]
10A, 10A1, 10A2, 10B optical fiber
20 Optical fiber sensing equipment
21 Acquisition department
22 Specific part
23 Memory section
24 Image acquisition department
25 Image processing unit
26 Position identification part
27 estimation department
28 Notification unit
30 camera
40 computer
401 processor
402 Memory
403 storage
404 I / O interface
4041 Display device
4042 input device
4043 Sound output device
405 communication interface
G underground
F fence
The scope of the claims
[Claim 1]
Optical fiber that detects vibration in the ground,
An acquisition unit that acquires an optical signal on which the vibration detected by the optical fiber is superimposed from the optical fiber, and
Based on the vibration pattern of the optical signal acquired by the acquisition unit, the specific unit that identifies suspicious behavior in the ground and the specific unit
Optical fiber sensing system equipped with.
[Claim 2]
The specific unit determines that suspicious behavior has occurred in the ground when periodic vibration is detected in the vibration pattern of the optical signal and the intensity of the vibration gradually increases.
The optical fiber sensing system according to claim 1.
[Claim 3]
Further equipped with a storage unit that stores in advance the vibration pattern of vibration that occurs when suspicious behavior occurs in the ground as the first vibration pattern.
When the vibration pattern of the optical signal acquired by the acquisition unit matches the first vibration pattern, the specific unit determines that a suspicious behavior corresponding to the first vibration pattern has occurred in the ground.
The optical fiber sensing system according to claim 1.
[Claim 4]
At least a part of the optical fiber is placed in the ground,
The acquisition unit acquires an optical signal from the optical fiber on which the vibration detected by the portion of the optical fiber placed in the ground is superimposed.
The optical fiber sensing system according to claim 2.
[Claim 5]
The storage unit previously stores the vibration pattern of the vibration generated when the ground is in a normal state as the second vibration pattern.
When the vibration pattern of the optical signal acquired by the acquisition unit is different from the second vibration pattern and matches the first vibration pattern, the specific unit corresponds to the first vibration pattern in the ground. Judging that suspicious behavior has occurred,
The optical fiber sensing system according to claim 3.
[Claim 6]
The optical fiber includes a first optical fiber arranged in the ground and a second optical fiber arranged on the ground.
The acquisition unit acquires an optical signal on which the vibration detected by the first optical fiber is superimposed from the first optical fiber, and superimposes the vibration detected by the second optical fiber on the second optical fiber. Get the optical signal
In the specific unit, the vibration pattern of the optical signal acquired by the acquisition unit from the first optical fiber is more vibrating than the vibration pattern of the optical signal acquired by the acquisition unit from the second optical fiber. When the intensity is high and the vibration pattern of the optical signal acquired by the acquisition unit from the first optical fiber matches the first vibration pattern, suspicious behavior corresponding to the first vibration pattern occurs in the ground. Judge that it has occurred,
The optical fiber sensing system according to claim 3.
[Claim 7]
A camera that can shoot the ground and
The image acquisition unit that acquires the camera image taken by the camera, and
Further equipped with an image processing unit that detects suspicious behavior from the camera image,
The specific unit is the first vibration pattern in the ground when the vibration pattern of the optical signal acquired by the acquisition unit matches the first vibration pattern and the image processing unit cannot detect suspicious behavior. Judging that suspicious behavior corresponding to
The optical fiber sensing system according to claim 3.
[Claim 8]
Further provided with a position specifying unit that specifies the position where the suspicious behavior specified by the specific unit occurs based on the vibration pattern of the optical signal acquired by the acquiring unit.
The optical fiber sensing system according to any one of claims 1 to 7.
[Claim 9]
An acquisition unit that acquires an optical signal on which the vibration detected by the optical fiber is superimposed from an optical fiber that detects vibration in the ground.
Based on the vibration pattern of the optical signal acquired by the acquisition unit, the specific unit that identifies suspicious behavior in the ground and the specific unit
Optical fiber sensing device equipped with.
[Claim 10]
Further equipped with a storage unit that stores in advance the vibration pattern of vibration that occurs when suspicious behavior occurs in the ground as the first vibration pattern.
When the vibration pattern of the optical signal acquired by the acquisition unit matches the first vibration pattern, the specific unit determines that a suspicious behavior corresponding to the first vibration pattern has occurred in the ground.
The optical fiber sensing device according to claim 9.
[Claim 11]
The storage unit previously stores the vibration pattern of the vibration generated when the ground is in a normal state as the second vibration pattern.
When the vibration pattern of the optical signal acquired by the acquisition unit is different from the second vibration pattern and matches the first vibration pattern, the specific unit corresponds to the first vibration pattern in the ground. Judging that suspicious behavior has occurred,
The optical fiber sensing device according to claim 10.
[Claim 12]
It is an underground behavior monitoring method using an optical fiber sensing system.
Optical fiber detects vibration in the ground Steps to put out and
The acquisition step of acquiring an optical signal on which the vibration detected by the optical fiber is superimposed from the optical fiber, and
A specific step to identify suspicious behavior in the ground based on the vibration pattern of the optical signal acquired in the acquisition step, and
Underground behavior monitoring method including.
[Claim 13]
Including a storage step in which the vibration pattern of vibration generated when a suspicious behavior occurs in the ground is stored in advance as the first vibration pattern.
In the specific step, when the vibration pattern of the optical signal acquired in the acquisition step matches the first vibration pattern, it is determined that a suspicious behavior corresponding to the first vibration pattern has occurred in the ground.
The underground behavior monitoring method according to claim 12.
[Claim 14]
In the storage step, the vibration pattern of the vibration generated when the ground is in a normal state is stored in advance as the second vibration pattern.
In the specific step, when the vibration pattern of the optical signal acquired in the acquisition step is different from the second vibration pattern and matches the first vibration pattern, it corresponds to the first vibration pattern in the ground. Judging that suspicious behavior has occurred,
The underground behavior monitoring method according to claim 13.
[Claim 15]
The image acquisition step to acquire the camera image taken by the camera that can shoot the ground,
Further includes an image processing step of detecting suspicious behavior from the camera image,
In the specific step, when the vibration pattern of the optical signal acquired in the acquisition step matches the first vibration pattern and suspicious behavior cannot be detected in the image processing step, the first vibration pattern is found in the ground. Judging that suspicious behavior corresponding to
The underground behavior monitoring method according to claim 13.