The present disclosure relates to road monitoring systems, road monitoring devices, road monitoring methods, and non-transitory computer-readable media.
Background technology
[0002]
　Conventionally, road abnormality detection is often performed manually, for example, a worker monitors an abnormality in road surface temperature (for example, road surface freezing) visually or by using a thermography camera or the like. They used to monitor the occurrence of landslides and the invasion of animals and humans into highways, etc., visually or by using cameras. However, when detecting an abnormality on a road by hand, it takes a lot of cost and time, and the detection and countermeasure of the abnormality may be delayed.
　Therefore, recently, a system for monitoring road abnormalities using an optical fiber has been proposed (for example, Patent Document 1).
[0003]
　In the technique described in Patent Document 1, an optical fiber is laid on the side of a road, and when a large external force such as a rockfall hitting the optical fiber is applied, the polarization state of an optical signal in the optical fiber changes. , Detect falling rocks on the road. At this time, in order to prevent malfunction due to causes other than falling rocks, the optical fiber cable is covered with a steel wire for preventing trauma.
Prior art literature
Patent documents
[0004]
Patent Document 1: Japanese Unexamined Patent Publication No. 2000-180219
Outline of the invention
Problems to be solved by the invention
[0005]
　In the technique described in Patent Document 1, an abnormality of a road is detected by monitoring the polarization state of an optical signal when a strong stress is applied to an optical fiber.
　Therefore, although it is possible to detect an extreme state such as falling rocks on a road, there is a problem that it is difficult to detect a state that hardly affects the stress on the optical fiber.
[0006]
　On the other hand, in recent years, with the development of IoT (Internet of Things) and the like, there is an increasing demand for detecting various environmental changes such as road surface temperature. However, changes in the road environment are unlikely to appear in significant changes in stress on the optical fiber.
[0007]
　Therefore, an object of the present disclosure is to provide a road monitoring system, a road monitoring device, a road monitoring method, and a non-temporary computer-readable medium capable of solving the above-mentioned problems and detecting an abnormal state of a road with high accuracy. There is.
Means to solve problems
[0008]
　The road monitoring system according to one aspect is based
　on a cable including a communication optical fiber laid on a road,
　a receiving unit that receives an optical signal from at least one communication optical fiber included in the cable, and the
　optical signal. A detection unit that detects a pattern according to the state of the road and detects an abnormal state of the road based on the detected pattern according to the state of the road
　is provided.
[0009]
　The road monitoring device according to one aspect
　has a receiving unit that receives an optical signal from at least one communication optical fiber included in a cable laid on the
　road, and a pattern according to the state of the road based on the optical signal.
　Is provided , and a detection unit for detecting an abnormal state of the road based on a pattern corresponding to the detected state of the road is provided.
[0010]
　The road monitoring method according to one aspect is a road monitoring method using a
　road monitoring device
　, in which an optical signal is received from at least one communication optical fiber included in a cable laid on the road,
　and based on the optical signal, the road monitoring method is performed . A pattern corresponding to the state of the road is detected, and an abnormal state of the road is detected based on the detected pattern according to the state of the road.
[0011]
　The non-temporary computer-readable medium according to one aspect
　is the
　road
　, based on the procedure of receiving an optical signal from at least one communication optical fiber included in a cable laid on the road, and the optical signal.
　A non-temporary computer that stores a procedure for detecting a pattern according to the state of the road and detecting an abnormal state of the road based on the detected pattern according to the state of the road, and a program for executing the procedure. It is a readable medium.
The invention's effect
[0012]
　According to the above aspect, the effect that the abnormal state of the road can be detected with high accuracy can be obtained.
A brief description of the drawing
[0013]
[Fig. 1] Fig. 1 is a diagram showing an example of a configuration of a road monitoring system according to an embodiment.
FIG. 2 is a diagram showing an example of machine learning by method B in the road monitoring system according to the embodiment.
[Fig. 3] Fig. 3 is a diagram showing an example of abnormality level information according to the embodiment.
FIG. 4 is a diagram showing an example of an application that can be realized based on an abnormal state detected by the detection unit according to the embodiment.
FIG. 5 is a block diagram showing an example of a hardware configuration of a computer that realizes the road monitoring device according to the embodiment.
[Fig. 6] Fig. 6 is a flow chart showing an example of an operation flow of the road monitoring system according to the embodiment.
[Fig. 7] Fig. 7 is a diagram showing an example of a road monitoring system according to another embodiment.
FIG. 8 is a diagram showing another example of a road monitoring system according to another embodiment.
FIG. 9 is a diagram showing an example of arrangement of a fiber sensing unit in a road monitoring system according to another embodiment.
FIG. 10 is a diagram showing another example of arrangement of a fiber sensing unit in a road monitoring system according to another embodiment.
FIG. 11 is a diagram showing still another example of the arrangement of the fiber sensing unit in the road monitoring system according to another embodiment.
FIG. 12 is a diagram showing still another example of arrangement of fiber sensing units in a road monitoring system according to another embodiment.
13 is a diagram showing an example of the operation of the fiber sensing unit when the optical fiber cable is broken in the road monitoring system of FIG. 9. FIG.
14 is a diagram showing an example of the operation of the fiber sensing unit when the optical fiber cable is broken in the road monitoring system of FIG. 10. FIG.
15 is a diagram showing an example of the operation of the fiber sensing unit when the optical fiber cable is broken in the road monitoring system of FIG. 12. FIG.
Forms for carrying out the invention
[0014]
　Hereinafter, embodiments of the present disclosure will be described with reference to the drawings.

　First, the configuration of the road monitoring system according to the present embodiment will be described with reference to FIG.
[0015]
　As shown in FIG. 1, the road monitoring system according to the present embodiment detects an abnormal state of the road 10, and includes an optical fiber cable 20 and a road monitoring device 33.
[0016]
　The optical fiber cable 20 is laid along the road 10. In FIG. 1, the optical fiber cable 20 is laid under the road 10, but the present invention is not limited to this, and the optical fiber cable 20 may be laid on the side of the road 10. Further, at this time, at the position where the state of the road 10 is particularly desired to be detected, the optical fiber cable 20 may be densely installed, for example, by laying the optical fiber cable 20 while forming a loop. As a result, the detection rate of abnormalities on the road 10 can be improved.
　The optical fiber cable 20 is a cable configured by covering one or more communication optical fibers, and one end thereof is routed inside the communication carrier station building 30.
[0017]
　The road monitoring system according to the present embodiment detects an abnormal state of the road 10 by using an optical fiber sensing technique using an optical fiber as a sensor.
　Specifically, inside the communication carrier station building 30, pulsed light is incident on the communication optical fiber included in the optical fiber cable 20. Then, as the pulsed light is transmitted through the communication optical fiber in the direction of the road 10, backscattered light is generated for each transmission distance. This backscattered light returns to the inside of the communication carrier station building 30 via the same communication optical fiber.
[0018]
　Here, the road 10 vibrates when a landslide or the like occurs, and the vibration of the road 10 is transmitted to the communication optical fiber. Further, the temperature of the road 10 rises when a fire or the like occurs, and the temperature change of the road 10 is also transmitted to the communication optical fiber. Further, on the road 10, when road surface deterioration or the like occurs, a sound corresponding to the road surface deterioration is generated, and the change in sound is also transmitted to the communication optical fiber. Therefore, in the optical fiber for communication, the pattern in which the vibration, temperature, and sound of the road 10 are transmitted depends on the state of the road 10 (for example, the presence or absence of an abnormality in the road surface temperature, the presence or absence of a landslide or rockfall, the highway, etc.). Invasion of animals and humans, fire, earthquake, strong wind (including typhoons and tornadoes), road surface deterioration, flood damage, etc. It depends.
[0019]
　Therefore, the backscattered light returning to the inside of the communication carrier station building 30 includes a pattern according to the state of the road 10. In the example of FIG. 1, the backscattered light returning to the inside of the communication carrier station building 30 includes patterns according to the states of various positions of the road 10.
[0020]
　The road monitoring system according to the present embodiment utilizes the fact that the backward scattered light returning to the inside of the communication carrier station building 30 includes a pattern corresponding to the state of the road 10, and the abnormal state of the road 10 is used. (For example, abnormal road surface temperature, landslides and rockfalls, invasion of animals and humans into highways, fires, earthquakes, strong winds (including typhoons and tornadoes), road surface deterioration, etc. ) Is detected.
[0021]
　Here, the road monitoring device 33 described above is provided inside the communication carrier station building 30. The road monitoring device 33 is a device newly installed for the realization of the present embodiment.
[0022]
　The road monitoring device 33 is a device having a function as an optical fiber sensing device and also having a function of detecting an abnormal state of the road 10. Specifically, the road monitoring device 33 includes a fiber sensing unit 331 and a detection unit 332. The fiber sensing unit 331 is an example of a receiving unit.
[0023]
　The fiber sensing unit 331 incidents pulsed light on at least one communication optical fiber included in the optical fiber cable 20. This pulsed light is transmitted in the direction of the road 10. Further, the fiber sensing unit 331 receives backscattered light with respect to the pulsed light from the same communication optical fiber as the communication optical fiber in which the pulsed light is incident. This backscattered light is received from the direction of the road 10.
[0024]
　At this time, as described above, the backscattered light received by the fiber sensing unit 331 includes a pattern according to the state of the road 10. Further, in the example of FIG. 1, the fiber sensing unit 331 receives backscattered light generated at various positions on the road 10 in time series.
[0025]
　Therefore, when the fiber sensing unit 331 receives the backscattered light, it first identifies the position of the road 10 where the backscattered light is generated. Further, the fiber sensing unit 331 detects the vibration state, the temperature state, the sound state, and the like at the specified position.
　Then, the detection unit 332 detects a pattern according to the state of the specified position of the road 10 based on the processing result of the backscattered light by the fiber sensing unit 331, and based on the detected pattern, the road. The abnormal state of 10 specified positions is detected.
[0026]
　Therefore, in the following, first, when the backscattered light is received in the fiber sensing unit 331, a method of specifying the position where the backscattered light is generated will be described.
[0027]
　In the present embodiment, the fiber sensing unit 331 scatters backscattered based on the time difference between the time when the pulsed light is incident on the optical fiber for communication and the time when the backscattered light is received from the same optical fiber for communication. Identify the location where the light was generated. At this time, the fiber sensing unit 331 specifies the generation position so that the smaller the time difference is, the closer it is to the fiber sensing unit 331.
[0028]
　Subsequently, a method of detecting an abnormal state of the road 10 by the detection unit 332 will be described below.
(A) Method A
　First, a method A for detecting an abnormal state of the road 10 will be described.
　The fiber sensing unit 331 performs a process of identifying the position of the road 10 where the backscattered light received from the communication optical fiber is generated. Further, the fiber sensing unit 331 detects the backward scattered light by a distributed acoustic sensor, a distributed vibration sensor, a distributed temperature sensor, or the like. , Performs processing for detecting the state of vibration, the state of temperature, the state of sound, and the like at a specified position on the road 10.
　Therefore, the detection unit 332 detects the pattern according to the state of the road 10 based on the processing result of the backscattered light by the fiber sensing unit 331.
[0029]
　Here, the detection unit 332 holds a correspondence table in which the pattern corresponding to the state of the road 10 and the state of the road 10 are associated with each other. Therefore, when detecting the abnormal state of the road 10, the detection unit 332 first detects the pattern according to the state of the road 10. Subsequently, the detection unit 332 uses the above-mentioned correspondence table to specify the state of the road 10 corresponding to the pattern corresponding to the state of the road 10 acquired above, thereby checking whether the road 10 is in an abnormal state. Judge whether or not.
[0030]
(B) Method B
　Subsequently, a method B for detecting an abnormal state of the road 10 will be described.
　In the present method B, the detection unit 332 machine-learns a pattern according to the state of the road 10 (for example, deep learning), and uses the learning result of the machine learning (initial learning model) to determine the abnormal state of the road 10. To detect.
[0031]
　First, the machine learning method in the method B will be described with reference to FIG. Here, a method of learning three patterns of distances from the fiber sensing unit 331 on the road 10 of xx [km], yy [km], and zz [km] as teacher data will be described.
　As shown in FIG. 2, the detection unit 332 inputs teacher data, which is abnormality level information indicating the degree of abnormality at three locations on the road 10, and patterns according to the states at the three locations (steps S1 and S2). ). FIG. 3 shows an example of abnormality level information that serves as teacher data. In FIG. 3, the larger the value of the abnormality level, the more the degree of abnormality is progressing. Further, the abnormality level information is held by the detection unit 332.
[0032]
　Subsequently, the detection unit 332 matches and classifies the two (step S3), and performs supervised learning (step S4). As a result, an initial learning model is obtained (step S5). This initial learning model is a model in which the state of the road 10 is output when a pattern corresponding to the state of the road 10 is input.
[0033]
　Subsequently, a method of detecting an abnormal state of the road 10 in the present method B will be described.
　When detecting an abnormal state of the road 10, the detection unit 332 first detects a pattern according to the state of the road 10 in the same manner as in the above method A. Subsequently, the detection unit 332 inputs the pattern to the initial learning model. As a result, the detection unit 332 obtains the state of the road 10 as the output result of the initial learning model, and therefore determines whether or not the road 10 is in an abnormal state.
[0034]
　As described above, in the present method B, the pattern corresponding to the state of the road 10 is machine-learned, and the learning result of the machine learning is used to detect the abnormal state of the road 10.
　It may be difficult for human analysis to extract features for detecting the state of the road 10 from the data. In the method B, by constructing a learning model from a large number of patterns, it is possible to detect the abnormal state of the road 10 with high accuracy even when it is difficult to analyze by humans.
[0035]
　In the machine learning in the method B, in the initial state, a learning model may be generated based on two or more teacher data. Further, the newly detected pattern may be newly learned in this learning model. At that time, the detailed conditions for detecting the abnormal state of the road 10 may be adjusted from the new learning model.
[0036]
　Subsequently, with reference to FIG. 2, an application that can be realized based on the abnormal state of the road 10 detected by the detection unit 332 will be described below.
　Based on the abnormal state of the road 10 detected by the detection unit 332, for example, the following applications (a) to (g) can be realized. Each application will be described below.
[0037]
(A) Road surface freezing detection
　task and effect: Since the
　road surface freezing of the road 10 may lead to a traffic accident, it is necessary to appropriately grasp in which section and to what extent the road surface is frozen.
　Outline of operation:
　The surface temperature of the road 10 is monitored via an optical fiber cable 20 laid under the road 10, and a case where the temperature is below a specific temperature is detected as road surface freezing.
[0038]
　(B) Landslide, rockfall detection, invasion detection of animals and humans
　Issues and effects:
　By remotely detecting landslides, rockfalls, and invasion of animals and humans in real time, the driver of a vehicle (automobile) Appropriate notification and quick response to dangerous areas will be possible.
　Outline of operation:
　Vibration generated by landslides, rockfalls, invasion of animals, humans, etc. is monitored via an optical fiber cable 20 laid under the road 10, and anomalies are detected by the characteristics of the vibration pattern.
　Further, the optical fiber cable 20 may be laid on a fence or a mountain slope.
[0039]
(C) Road fire detection
　issues and effects:
　By remotely monitoring the situation of a fire in real time, quick digestion activities are possible.
　Outline of operation:
　The surface temperature of the road 10 is monitored via an optical fiber cable 20 laid under the road 10, and a fire is detected when the temperature is equal to or higher than a specific temperature.
[0040]
(D) Earthquake detection
　issues and effects:
　By monitoring the vibration status over a wide area, it is possible to grasp the location of the earthquake and the propagation of the earthquake. It is possible to get breaking news of earthquakes and quickly grasp the situation.
　Outline of operation:
　The vibration of the optical fiber cable 20 buried in the road 10 is monitored, and the epicenter and the arrival speed of the earthquake are detected by analyzing the vibration condition over a wide area.
[0041]
(E) Occurrence of strong winds (including typhoons and tornadoes)
　Issues and effects:
　By remotely detecting the wind speed of the entire road 10, the vehicle will avoid traveling to the dangerous area.
　Outline of operation: The
　wind speed is monitored from the vibration of the optical fiber cable 20 laid along the road 10.
　When the wind speed exceeds the threshold value, it is detected as a strong wind.
[0042]
(F) Road surface deterioration
　problem and effect:
　By monitoring the cracks and deterioration state of the road surface over the entire road 10, it is possible to reduce the inspections that have been performed manually.
　Operation outline:
　Monitor the sound and vibration generated on the road 10.
　Road surface deterioration is detected by the characteristics of the vibration pattern.
[0043]
(G) Flood damage
　issues and effects:
　By remotely detecting the flood damage situation of the entire road 10, the progress of the vehicle to the dangerous area is avoided.
　Outline of operation: The
　position where the temperature change is remarkably changed is specified from the temperature condition of the entire road 10, and it is determined that flood damage has occurred at the specified position.
[0044]
　Subsequently, with reference to FIG. 5, the hardware configuration of the computer 40 that realizes the road monitoring device 33 will be described below.
　As shown in FIG. 5, 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.
[0045]
　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 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.
[0046]
　The storage 403 stores a program that realizes the functions of the fiber sensing unit 331 and the detection unit 332 included in the road monitoring device 33. The processor 401 realizes the functions of the fiber sensing unit 331 and the detection unit 332 by executing each of these programs. 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. The memory 402 and the storage 403 also play a role of storing information and data held by the fiber sensing unit 331 and the detection unit 332.
[0047]
　In addition, the above-mentioned programs are stored using various types of non-transitory computer readable medium and can be supplied to a computer (including a computer 40). Non-transient 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), photomagnetic recording media (eg, photomagnetic discs), CD-ROMs (Compact Disc-Read Only Memory). , CD-R (CD-Recordable), CD-R / W (CD-ReWritable), semiconductor memory (for example, mask ROM, PROM (Programmable ROM), EPROM (Erasable PROM), flash ROM, RAM (Random Access Memory) )including. The program may also be supplied to the computer by various types of transient computer readable medium. Examples of temporary computer-readable media include electrical, optical, and electromagnetic waves. The temporary 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.
[0048]
　The input / output interface 404 is connected to a display device 4041, an input device 4042, 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) or a CRT (Cathode Ray Tube) display. 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 computer 40 may also include a distributed acoustic sensor, a distributed vibration sensor, a sensor (not shown) including a distributed temperature sensor, and the like, and the sensor may be connected to the input / output interface 404.
[0049]
　The communication interface 405 transmits / receives data to / 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.
[0050]

　The operation of the road monitoring system according to the present embodiment will be described below. Here, the operation flow of the road monitoring system according to the present embodiment will be described with reference to FIG.
[0051]
　As shown in FIG. 6, first, the fiber sensing unit 331 injects pulsed light into at least one communication optical fiber included in the optical fiber cable 20 (step S11).
　Subsequently, the fiber sensing unit 331 receives the backscattered light from the same communication optical fiber as the communication optical fiber incident with the pulsed light (step S12).
[0052]
　Subsequently, the fiber sensing unit 331 identifies the position of the road 10 that generated the backscattered light received in step S12 (step S13). At this time, the fiber sensing unit 331 may specify the position where the backscattered light is generated by using the method based on the time difference described above. Further, the fiber sensing unit 331 detects a vibration state, a temperature state, a sound state, and the like at a specified position on the road 10.
[0053]
　After that, the detection unit 332 detects a pattern according to the state of the position of the road 10 specified in step S13 based on the backscattered light received in step S12. More specifically, the pattern is detected based on the processing result of the backscattered light by the fiber sensing unit 331. Then, the detection unit 332 detects the abnormal state of the position of the road 10 identified in step S13 based on the detected pattern (step S14). At this time, the detection unit 332 may detect the abnormal state by using any of the methods A and B described above.
[0054]
　In FIG. 6, the processes of steps S13 and S14 may be performed each time the backscattered light is received in step S12. Alternatively, in step S12, after a plurality of backscattered lights are received, the processes of steps S13 and S14 may be performed for each backscattered light.
[0055]

　As described above, according to the present embodiment, the backscattered light (optical signal) is received from at least one communication optical fiber included in the optical fiber cable 20, and the received backscattered light (optical signal) is received. A pattern corresponding to the state of the road 10 is detected based on the light, and an abnormal state of the road 10 is detected based on the detected pattern. Therefore, the abnormal state of the road 10 can be detected with high accuracy.
[0056]
　Further, according to the present embodiment, in order to detect an abnormal state of the road 10, an existing optical fiber for communication is sufficient, and as in Patent Document 1, an optical fiber cable made of a steel wire for preventing damage. There is no need to cover. Therefore, since a dedicated structure for detecting the abnormal state of the road 10 is not required, the road monitoring system can be constructed at low cost.
[0057]
　Further, according to the present embodiment, since the abnormal state of a plurality of roads 10 can be detected simultaneously and remotely by using the existing optical fiber for communication, the state of the road 10 can be easily grasped and the state of the road 10 can be grasped. The cost for grasping the state of the road 10 can also be reduced.
[0058]
　Further, according to the present embodiment, an optical fiber sensing technique using an optical fiber as a sensor is used. Therefore, advantages such as being unaffected by electromagnetic noise, eliminating the need for power supply to the sensor, being excellent in environmental resistance, and facilitating maintenance can be obtained.
[0059]
The
　detection unit 332 shall hold the abnormal state of the road 10 detected above for each position of the road 10, and periodically (for example, every year), the position. By detecting the abnormal state of, the state change of the abnormal state at that position over time may be detected.
[0060]
　Further, the detection unit 332 may detect a sign of abnormality or damage at the position of the road 10 based on a change of state of the abnormal state over time.
[0061]
　Further, the analyst may actually decompose the portion of the position of the road 10 detected as abnormal by the detection unit 332 and determine the actual abnormality level. At this time, if there is a difference between the abnormality level detected by the detection unit 332 and the abnormality level determined by the analyst, the difference may be fed back to the detection unit 332. In this case, since the detection unit 332 subsequently detects the abnormal state of the road 10 so as to approach the actual abnormality level, the detection accuracy can be improved.
[0062]
　Further, when the detection unit 332 machine-learns the pattern according to the state of the road 10 by the above method B, it is considered that the state of the road 10 differs depending on the area. For example, the conditions may differ between warm and cold regions. Therefore, the detection unit 332 may perform machine learning for each region by using the teacher data corresponding to the region.
[0063]
　Further, in the above-described embodiment, it is assumed that the existing optical fiber cable 20 is used, but as shown in FIG. 7, the optical fiber cable 20 is newly installed, and the data collecting unit 34 is attached to the newly installed optical fiber cable 20. May be connected. The data collection unit 34 also collects data on the pattern of the road 10 (for example, sound, temperature, vibration, etc.) and transmits the collected data to the detection unit 332. At this time, the data may be transmitted from the data collection unit 34 to the detection unit 332 via the optical fiber cable 20 or via a separately provided radio. The detection unit 332 detects an abnormal state of the road 10 based on the data collected by the data collection unit 34 and the fiber sensing unit 331. Therefore, the detection accuracy can be improved.
[0064]
　Further, as shown in FIG. 8, a traffic control system 50 that manages the traffic of vehicles on the road 10 may be provided based on the detection result by the road monitoring device 33. The traffic control system 50 is an example of a distribution unit. When an abnormal condition of the road 10 is detected, the traffic control system 50 informs the driver of the vehicle that the abnormality is detected on the road 10 or the like by using the highway radio, the information board on the road 10, the Internet, etc. It may be distributed via an application or the like. Further, when an abnormal state of the road 10 is detected, the traffic control system 50 may deliver a warning for driving the vehicle to the driver of the vehicle. Further, when the traffic control system 50 closes the road 10 where an abnormality is detected, the traffic control system 50 may distribute the road closure information to the driver of the vehicle. Further, the traffic control system 50 may present to the system administrator or the like an abnormal state of the road 10, a change of state of the abnormal state of the road 10 over time, a sign of an abnormality or damage of the road 10, and the like. Further, the traffic control system 50 may calculate the pavement time of the road 10 based on the detection result by the road monitoring device 33, and present the pavement time of the road 10 to the system administrator or the like. Further, although the traffic control system 50 is provided outside the communication carrier station building 30, some functions (for example, the function of the distribution unit, etc.) may be provided inside the communication carrier station building 30. Further, when the traffic control system 50 is provided outside the communication carrier station building 30, the roads 10 connected to each of the plurality of communication carrier station buildings 30 by the optical fiber cable 20 are centrally provided by one traffic control system 50. You may monitor it.
[0065]
　Further, the fiber sensing unit 331 and the detection unit 332 of the road monitoring device 33 may be provided separately from each other. For example, only the fiber sensing unit 331 may be provided inside the communication carrier station building 30, and the road monitoring device 33 including the detection unit 332 may be provided outside the communication carrier station building 30.
[0066]
　Further, in the above-described embodiment, only one fiber sensing unit 331 is provided and occupies the optical fiber cable 20, but the present invention is not limited to this. Here, the arrangement of the fiber sensing unit 331 in the road monitoring system according to another embodiment will be described with reference to FIGS. 9 to 12. Note that in FIGS. 9 to 12, the detection unit 332 is not shown.
[0067]
　In the example of FIG. 9, the fiber sensing unit 331 shares the optical fiber cable 20 with the existing communication equipment 31. Further, in order to share the optical fiber cable 20 between the fiber sensing unit 331 and the existing communication equipment 31, a filter 32 for signal separation is provided.
[0068]
　In the example of FIG. 10, one fiber sensing unit 331 is provided for each of the plurality of communication carrier stations 30 (in FIG. 10, the two communication carrier stations 30A and 30Z). Specifically, fiber sensing units 331A and 331Z are provided inside the communication carrier station buildings 30A and 30Z, respectively. In the example of FIG. 10, the road 10A is connected to the communication carrier station building 30A by the optical fiber cable 20, and the road 10B is connected to the communication carrier station building 30Z by the optical fiber cable 20, and the roads 10A and 10B are connected. Is connected by an optical fiber cable 20. The communication equipments 31A and 31Z correspond to the communication equipment 31, and the filters 32A and 32Z correspond to the filter 32.
　In the example of FIG. 10, the fiber sensing units 331A and 331Z both monitor the roads 10A and 10B.
[0069]
　In the example of FIG. 11, the data collection unit 34 is provided near the road 10A as compared with FIG. Here, only one data collection unit 34 is provided for the roads 10A and 10B, but the data collection unit 34 is one for a predetermined number of roads 10 or a predetermined road length of the road 10. One should be provided for each, and one or more may be provided.
[0070]
　In the example of FIG. 11, each data collection unit 34 collects data of the corresponding road 10 pattern (for example, sound, temperature, vibration, etc.), and the detection unit 332 collects the data collected by each data collection unit 34. Summarize. At this time, data may be transmitted from each data collection unit 34 to the detection unit 332 via the optical fiber cable 20 or via a separately provided radio. The detection unit 332 detects an abnormal state of the road 10 for which the data collection unit 34 has collected data based on the data.
[0071]
　Therefore, the monitor section of one fiber sensing unit 331 is shortened, and the number of roads 10 to be monitored and the road length are reduced. Since the monitor section of the fiber sensing unit 331 is short, the transmission distance of the pulsed light and the backscattered light is shortened, so that the fiber loss is reduced. As a result, the S / N ratio (signal-to-noise ratio) of the received backscattered light can be improved, and the monitor accuracy can be improved. Further, the monitoring cycle can be improved by reducing the number of roads 10 to be monitored and the road length of the fiber sensing unit 331.
[0072]
　In the example of FIG. 12, a plurality of fiber sensing units 331 (in FIG. 12, two fiber sensing units 331A and 331Z) are provided in one communication carrier station building 30AZ. In the example of FIG. 12, the road 10A is connected to the fiber sensing unit 331A by the optical fiber cable 20, the road 10B is connected to the fiber sensing unit 331Z by the optical fiber cable 20, and the roads 10A and 10B are optical. It is connected by a fiber cable 20. The communication equipments 31A and 31Z correspond to the communication equipment 31, and the filters 32A and 32Z correspond to the filter 32.
[0073]
　In the example of FIG. 12, the fiber sensing units 331A and 331Z both monitor the roads 10A and 10B. However, the fiber sensing unit 331A injects the pulsed light in the clockwise direction to monitor the roads 10A and 10B, and the fiber sensing unit 331Z injects the pulsed light in the counterclockwise direction to inject the pulsed light in the counterclockwise direction to monitor the roads 10A and 10B. Monitor 10B.
[0074]
　When a plurality of fiber sensing units 331 are provided as shown in FIGS. 10 to 12, one road monitoring device 33 including the detection unit 332 may be provided for the plurality of fiber sensing units 331. Then, the state of the road 10 connected to each of the plurality of fiber sensing units 331 by the optical fiber cable 20 may be intensively detected by one road monitoring device 33. In this case, the road monitoring device 33 may be provided inside any one of the communication carrier station building 30, or may be provided outside the communication carrier station building 30.
[0075]
　Further, the optical fiber cable 20 laid on the road 10 may be disconnected. Therefore, with reference to FIGS. 13 to 15, the operation of the fiber sensing unit 331 when the optical fiber cable 20 is disconnected in the road monitoring system according to another embodiment will be described. Note that in FIGS. 13 to 15, the detection unit 332 is not shown.
[0076]
　The example of FIG. 13 is an example in which the optical fiber cable 20 of the road 10 is broken in the configuration of FIG. The fiber sensing unit 331 continues to inject pulsed light into the optical fiber cable 20 even if the optical fiber cable 20 is disconnected. As a result, the communication carrier station building 30 can continuously monitor the section up to the disconnected position.
[0077]
　The example of FIG. 14 is an example in which the optical fiber cable 20 of the road 10A is broken in the configuration of FIG. The fiber sensing units 331A and 331Z continue to inject pulsed light into the optical fiber cable 20 even if the optical fiber cable 20 is disconnected. At this time, the road 10 is always connected to two or more communication carrier station buildings 30 (two communication carrier station buildings 30A and 30Z in FIG. 14). Therefore, by monitoring the communication carrier stations 30A and 30Z from both directions, it is possible to construct a redundant configuration in which the entire section can be continuously monitored in the event of a single failure.
[0078]
　The example of FIG. 15 is an example in which the optical fiber cable 20 of the road 10A is broken in the configuration of FIG. The fiber sensing units 331A and 331Z continue to inject pulsed light into the optical fiber cable 20 even if the optical fiber cable 20 is disconnected. At this time, in the example of FIG. 15, a ring configuration in which the optical fiber cables 20 are connected in a ring shape is constructed. Therefore, by monitoring the ring from one communication carrier station building 30AZ in both directions, it is possible to construct a redundant configuration capable of continuously monitoring the entire section in the event of a single failure.
[0079]
　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.
[0080]
　In addition, some or all of the above embodiments may be described as in the following appendix, but are not limited to the following.
　　　(Appendix 1)
　A cable including a communication optical fiber laid on a road,
　a receiving unit that receives an optical signal from at least one communication optical fiber included in the cable, and the
　road based on the optical signal. A
　road monitoring system including a detection unit that detects a pattern according to the state of the road and detects an abnormal state of the road based on the detected pattern according to the state of the road.
　　　(Appendix 2) The
　receiving unit
　identifies the position of the road on which the optical signal is generated based on the optical signal, and the
　detecting unit is
　based on a pattern according to the detected road condition. ,
　The road monitoring system according to Appendix 1, which detects an abnormal state of the identified road position .
　　　(Appendix 3) 　The road monitoring system according to Appendix 1 or 2
　, further comprising a distribution unit that distributes the detected information on the abnormal state of the road to the driver of the vehicle
.
　　　(Appendix 4)
　A receiving unit that receives an optical signal from at least one communication optical fiber included in a cable laid on a road.

　Road monitoring including 　a detection unit that detects a pattern according to the state of the road based on the optical signal and detects an abnormal state of the road based on the detected pattern according to the state of the road. Device.
　　　(Appendix 5) The
　receiving unit
　identifies the position of the road on which the optical signal is generated based on the optical signal, and the
　detecting unit is
　based on a pattern according to the detected road condition. ,
　The road monitoring device according to Appendix 4, which detects an abnormal state of the identified road position .
　　　(Appendix 6)
　A road monitoring method using a road monitoring device, in which
　an optical signal is received from at least one communication optical fiber included in a cable laid on the
　road, and the state of the road is based on the optical signal. A
　road monitoring method for detecting an abnormal state of the road based on the detected pattern according to the state of the road.
　　　(Appendix 7) The
　computer 　detects
　a procedure for receiving an optical signal from at least one communication optical fiber included in a cable laid on the
road, and a pattern according to the road condition based on the optical signal. Then, based on the detected pattern according to the road condition, the procedure for detecting the abnormal condition of the road and the procedure for detecting the abnormal condition of the road.
　A non-transitory computer-readable medium that contains a program for executing.
[0081]
　This application claims priority on the basis of Japanese application Japanese Patent Application No. 2018-229185 filed on December 6, 2018, and incorporates all of its disclosures herein.
Code description
[0082]
　10, 10A, 10B Road
　20 Optical fiber cable
　30, 30A, 30Z, 30AZ Communication carrier station building
　31, 31A, 31Z Communication equipment
　32, 32A, 32Z Filter
　33 Road monitoring device
　331, 331A, 331Z Fiber sensing unit
　332 Detection unit
　34 Data collection unit
　40 Computer
　401 Processor
　402 Memory
　403 Storage
　404 Input / output interface
　4041 Display device
　4042 Input device
　405 Communication interface
　50 Traffic control system
The scope of the claims
[Claim 1]
　A cable including a communication optical fiber laid on a road,
　a receiving unit that receives an optical signal from at least one communication optical fiber included in the cable, and a receiver
　based on the optical signal according to the condition of the road. A
　road monitoring system including a detection unit that detects an abnormal state of the road and detects an abnormal state of the road based on a pattern corresponding to the detected pattern of the road.
[Claim 2]
　The receiving unit
　identifies the position of the road on which the optical signal is generated based on the optical signal, and the
　detecting unit identifies the position of the road based on the detected
　pattern according to the state of the road.
　The road monitoring system according to claim 1, wherein an abnormal state of the position of the road is detected .
[Claim 3]

　The road monitoring system according to claim 1 or 2 　, further comprising a distribution unit that distributes the detected information on the abnormal state of the road to the driver of the vehicle .
[Claim 4]
　A receiving unit that receives an optical signal from at least one communication optical fiber included in a cable laid on a
　road, and a pattern corresponding to the state of the road is detected based on the optical signal, and the detected pattern is described. A road
　monitoring device including a detection unit that detects an abnormal state of the road based on a pattern according to the state of the road.
[Claim 5]
　The receiving unit
　identifies the position of the road on which the optical signal is generated based on the optical signal, and the
　detecting unit identifies the position of the road based on the detected
　pattern according to the state of the road.
　The road monitoring device according to claim 4 , which detects an abnormal state of the position of the road.
[Claim 6]
　A road monitoring method using a road monitoring device,
　in which an optical signal is received from at least one communication optical fiber included in a cable laid on the
　road, and a pattern according to the road condition is received based on the optical signal. A
　road monitoring method for detecting an abnormal state of the road based on a pattern corresponding to the detected state of the road.
[Claim 7]
　The computer 　detects and detects a pattern according to the state of the road based on
　the procedure of receiving an optical signal from at least one communication optical fiber included in a cable laid on the road and the
optical signal. A
　non-temporary computer-readable medium containing a procedure for detecting an abnormal state of the road and a program for executing the procedure based on a pattern according to the state of the road .