FIELD OF INVENTION
[0001] The embodiment herein generally relates to the field of fiber optic technology. More specifically, the invention provides a fiber optic perimeter intrusion detection system.
BACKGROUND AND PRIOR ART
[0002] Fiber optic perimeter intrusion detection system enhances ability of security team to identify and respond to intrusion events accurately. High value sites are mainly targets for both theft and terrorism and therefore are usually protected with perimeter fencing. Conventional methods for monitoring the perimeter fence with sensors or instruments are often unreliable, expensive or inefficient in keeping away intruders. Some methods have a high rate of false positive alarms caused by non-intruder events. Others have a high rate of false negatives because the system’s sensitivity cannot detect actual intrusions. High rates of false positives lead to operator fatigue, and the system is eventually ignored. High rates of false negatives lead to distrust of the system.
[0003] Therefore, there is a need to develop a cost effective fiber optic perimeter intrusion detection system. Further, there is still a need to develop a fiber optic perimeter intrusion detection system with high sensitivity, minimum noise, less false alarms and to serve the purpose of security without intruder’s knowledge.

OBJECTS OF THE INVENTION
[0004] Some of the objects of the present disclosure are described herein below:
[0005] A main object of the present invention is to provide a cost effective
concealed fiber optic perimeter intrusion detection system that demands high
security.
[0006] Another object of the present invention is to provide a fiber optic
perimeter intrusion detection system that ensures a radiation free security at a
reasonable cost thereby ensuring complete liberation of electromagnetic
interference (EMI) or radio frequency interference (RFI).
[0007] Still another object of the present invention is to provide a fiber optic
perimeter intrusion detection system with high sensitivity, minimum noise, less
false alarms and that serves the purpose of security without intruder’s knowledge.
[0008] Yet another object of the present invention is to provide a fiber optic
perimeter intrusion detection system that utilizes single mode optical fiber and
very less electronics.
[0009] Another object of the present invention is to provide a fiber optic
perimeter intrusion detection system capable of underground installation to avoid
detection by external sources.
[00010] Another object of the present invention is to provide a fiber optic
perimeter intrusion detection system with minimum cost of maintenance.
[00011] Another object of the present invention is to provide a fiber optic
perimeter intrusion detection system with completely passive sensor.
[00012] Another object of the present invention is to provide a fiber optic
perimeter intrusion detection system with no electrical parts or no electricity along
the fiber sensor.

[00013] Another object of the present invention is to provide a small and light
weight fiber optic perimeter intrusion detection system.
[00014] Another object of the present invention is to provide a fiber optic
perimeter intrusion detection system with high reliability and environmental
stability.
[00015] Another object of the present invention is to provide a fiber optic
perimeter intrusion detection system that is capable of large perimeter coverage
and determining intrusion accurately.
[00016] Another object of the present invention is to provide a fiber optic
perimeter intrusion detection system that is capable of enabling speedy
notification to control facilities or guards through alarm system.
[00017] The other objects and advantages of the present invention will be
apparent from the following description when read in conjunction with the
accompanying drawings, which are incorporated for illustration of preferred
embodiments of the present invention and are not intended to limit the scope
thereof.
SUMMARY OF THE INVENTION
[00018] In view of the foregoing, an embodiment herein provides a perimeter intrusion detection system. According to an embodiment, the perimeter intrusion detection system comprises of plurality of optical laser source, plurality of optical detector, plurality of optical devices, plurality of fiber optic cable provided under ground and a signal processing unit.
[00019] One end of the fiber optic cable is connected to the optical laser source and another end of the fiber optic cable is connected to the optical detector. The fiber optic cable is capable of distributed acoustic sensing in a form of vibrations.

According to an embodiment, the optical detector is configured to convert the sensed vibrations in to electrical signal. According to an embodiment, the signal processing unit is configured to process the electrical signal for measuring strain changes at all points along the fiber optic cable length during said vibrations and for determining intrusion by comparing power of processed electrical signal with a threshold and thereby generating an alarm through a buzzer or a led or sending a warning message to a concerned number through wired or wireless mode based on the determined intrusion.
[00020] According to an embodiment, the vibration is detected when an intruder is near a sensor level where said threshold is set.
[00021] According to an embodiment, the fiber optic cable provided underground is capable of detecting both underground and over ground distributed acoustic signals. According to an embodiment, the fiber optic cable utilizes mach-zehnder (MZ) interference principle for distributed acoustic sensing. The determined intrusion data are stored in a local server or a cloud based server for retrieving when necessary and for scrutiny verification.
[00022] According to an embodiment, the determined events include digging, ground movement, vehicle passing and human walking. The optical device may include optical coupler, wherein said optical coupler is joined with the fiber optic cable and fiber joints covered using sleeves for protection.
[00023] These and other aspects of the embodiments herein will be better appreciated and understood when considered in conjunction with the following description and the accompanying drawings. It should be understood, however, that the following descriptions, while indicating preferred embodiments and numerous specific details thereof, are given by way of illustration and not of

limitation. Many changes and modifications may be made within the scope of the embodiments herein without departing from the spirit thereof, and the embodiments herein include all such modifications.
BRIEF DESCRIPTION OF DRAWINGS
[00024] The detailed description is set forth with reference to the accompanying
figures. In the figures, the left-most digit(s) of a reference number identifies the
figure in which the reference number first appears. The use of the same reference
numbers in different figures indicates similar or identical items.
[00025] Fig.1 illustrates an exemplary working model of fiber optic perimeter
intrusion detection system, according to an embodiment herein;
[00026] Fig.2 illustrates an exemplary model of fiber optic perimeter intrusion
detection system, according to an embodiment herein;
[00027] Fig.3a illustrates a front view of an exemplary model 300 of fiber optic
perimeter intrusion detection system, according to an embodiment herein; and
[00028] Fig.3b illustrates a back view of an exemplary model 300 of fiber optic
perimeter intrusion detection system, according to an embodiment herein.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS
[00029] The embodiments herein and the various features and advantageous details thereof are explained more fully with reference to the non-limiting embodiments and detailed in the following description. Descriptions of well-known components and processing techniques are omitted so as to not unnecessarily obscure the embodiments herein. The examples used herein are intended merely to facilitate an understanding of ways in which the embodiments herein may be practiced and to further enable those of skill in the art to practice

the embodiments herein. Accordingly, the examples should not be construed as limiting the scope of the embodiments herein.
[00030] As mentioned above, there is a need to develop a perimeter intrusion detection system. The embodiments herein achieve this by providing a fiber optic perimeter intrusion detection system. Referring now to the drawings, and more particularly to FIGS. 1 through 3, where similar reference characters denote corresponding features consistently throughout the figures, there are shown preferred embodiments.
[00031] Fig.1 illustrates an exemplary working model 100 of fiber optic perimeter intrusion detection system, according to an embodiment. According to an embodiment, the perimeter intrusion detection system comprises of plurality of optical laser source, plurality of optical detector, plurality of optical devices, plurality of fiber optic cable 101 provided under ground and a signal processing unit.
[00032] One end of the fiber optic cable 101 is connected to the optical laser source and another end of the fiber optic cable 101 is connected to the optical detector. The fiber optic cable 101 is capable of distributed acoustic sensing in a form of vibrations. According to an embodiment, the optical detector is configured to convert the sensed vibrations in to electrical signal. According to an embodiment, the signal processing unit is configured to process the electrical signal for measuring strain changes at all points along the fiber optic cable 101 length during said vibrations and for determining intrusion by comparing power of processed electrical signal with a threshold and thereby generating an alarm 102 through a buzzer or a led or sending a warning message 103 to a concerned number through wired or wireless mode based on the determined intrusion. The

determined intrusion data are stored in a local server or a cloud based server for retrieving when necessary and for scrutiny verification.
[00033] According to an embodiment, the vibration is detected when an intruder is near a sensor level where said threshold is set.
[00034] According to an embodiment, the fiber optic cable 101 provided underground is capable of detecting both underground and over ground distributed acoustic signals. According to an embodiment, the fiber optic cable 101 utilizes mach-zehnder (MZ) interference principle for distributed acoustic sensing. According to an embodiment, the fiber optic distributed acoustic sensing cable is installed underground at a depth of 5 to 25 inch deeper in the soil. The concealed fiber optic cable 101 will be invisible to the outside world which prevents intruders from taking measures to damage the system or skip the system that will give full protection effect to the client. As an intruder approaches the sensing cable deployed area the control center starts getting positive signals of approaching intruder and once the intruder is near the sensor level where the threshold has been set we will get an alarm through buzzer, led and an immediate warning message will be send to a concerned authorized number which will lead to chance of immediate action before intruder can escape or damage our properties or belongings.
[00035] The sensing element is continues fiber optic sensor cable. The sensing element can be attached to the fence by means of ultraviolet resistant cable ties or buried under ground in conduits or in the form of cables for detecting both underground and over ground disturbances. The fiber optic sensor cable is passive all along the zonal length. The sensitivity level shall be adjustable for each zone’s specific conditions. The probability of detection of an intruder cutting the fence, and for unaided climbing attempts or intrusion activities like digging the ground surrounded shall be 95% with a 95% confidence factor.

[00036] The signal processing unit is capable of monitoring multiple detection zones. The signal processing unit operates either as a standalone unit with local alarm relays, or as an integral component of a centralized control and maintenance facility. The signal processing unit includes internal circuitry to protect against lightning and voltage transients. The signal processing unit utilizes digital signal processing techniques that employ adaptive algorithms, capable of adapting to specific fence types and environmental conditions. The signal processing enables the specific event detection and thereby generating alert using buzzer and led and notification alerts that includes SMS or miscall alert. SMS or Email or miscall alert should reach the concerned persons contact immediately after the intrusion without any delay. Update about the notification send should be present in the control system. Notification to contacts and specifications can be designed according to customer requirement. [00037] According to an embodiment, fiber optic perimeter intrusion detection system further includes a control system 104 configured for displaying the determined intrusion by connecting the control system 104 to an ethernet port (TCP/IP) provided in the perimeter intrusion detection system, wherein the determined intrusions are displayable in a form of led indication and/or buzzer indication with zone mapping. The control system 104 is capable of updating alert on each zone with respect to the date and time of occurrence of the intrusion. The control system 104 is further capable of displaying the intrusion along with region, device, type of installation and different zones. The control system 104 is further capable of sending alert messages to a concerned number through wired or wireless mode based on the determined intrusion.
[00038] According to an embodiment, the determined events include digging (10 to 50 m), ground movement (5 to 10 m), vehicle passing (10 to 20 m) and human walking (1 to 2 m). The optical device may include optical coupler, wherein said

optical coupler is joined with the fiber optic cable and fiber joints covered using sleeves for protection.
[00039] Fig.2 illustrates an exemplary model of fiber optic perimeter intrusion detection system, according to an embodiment herein. The source and the detector modules are powered using standard power supply devices. The source will be 1550nm laser source with its own control mechanism for power adjustments. According to an embodiment, manual knobs 201 are provided for changing laser and detector powers.
[00040] Fig.3a illustrates a front view of an exemplary model 300 of fiber optic perimeter intrusion detection system, according to another embodiment herein. The optical detector includes a meter that displays the received power level for the selected zone in order to simplify field setup and to set the optimum power level independent of zone length. According to an embodiment, fiber optic perimeter intrusion detection system further includes push buttons 301, liquid crystal display (LCD) screen 302, transmitter toggle switches 303, indication LED’s 304 and fiber optic (FC) adapters 305.
[00041] According to an embodiment, the push button 301 is configured for changing optical laser source power and detector threshold. According to an embodiment, the LCD screen 302 is configured for displaying optical laser source power and detector threshold. According to an embodiment, the indication LED’s 304 are configured for indicating power ON and battery operation and further configured for indicating intrusion at each zone. According to an embodiment, the FC adapters 305 are metal adapters with less loss for optical laser source and optical detectors.

[00042] Fig.3b illustrates a back view of an exemplary model 300 of fiber optic perimeter intrusion detection system, according to another embodiment herein. According to an embodiment, fiber optic perimeter intrusion detection system further includes relay output port for each zone 306, alarm or buzzer indication 307, ethernet port 308 and 12V DC power supply 309. According to an embodiment, the relay output with normally open (NO) contacts / normally closed (NC) contacts 306 for each zone. Every intrusion triggers the relay contact for the respective zone and gives a specified voltage. According to an embodiment, the ethernet port (TCP/IP) 308 configured to connect the control system with the perimeter intrusion detection system for displaying the intrusion.
[00043] A main advantage of the present invention is that the perimeter intrusion detection system is cost effective, concealed and provides high security. [00044] Another advantage of the present invention is that the fiber optic perimeter intrusion detection system ensures a radiation free security at a reasonable cost thereby ensures complete liberation of electromagnetic interference (EMI) or radio frequency interference (RFI).
[00045] Still another advantage of the present invention is that the fiber optic perimeter intrusion detection system possess high sensitivity, minimum noise, less false alarms and serves the purpose of security without intruder’s knowledge. [00046] Yet another advantage of the present invention is that the fiber optic perimeter intrusion detection system utilizes single mode optical fiber and very less electronics.
[00047] Another advantage of the present invention is that the provided fiber optic perimeter intrusion detection system is capable of underground installation to avoid detection by external sources.

[00048] Another advantage of the present invention is that the fiber optic
perimeter intrusion detection system has minimum cost of maintenance.
[00049] Another advantage of the present invention is that the fiber optic
perimeter intrusion detection system is provided with completely passive sensor.
[00050] Another advantage of the present invention is that the fiber optic
perimeter intrusion detection system does not have any electrical parts or no
electricity along the fiber sensor.
[00051] Another advantage of the present invention is that the fiber optic
perimeter intrusion detection system is small and light weight.
[00052] Another advantage of the present invention is that the fiber optic
perimeter intrusion detection system has high reliability and environmental
stability.
[00053] Another advantage of the present invention is that the fiber optic
perimeter intrusion detection system is capable of large perimeter coverage and
determining intrusion accurately.
[00054] Another advantage of the present invention is that the fiber optic
perimeter intrusion detection system is capable of enabling speedy notification to
control facilities or guards through alarm system.
[00055] Another advantage of the present invention is that the fiber optic
perimeter intrusion detection system is adaptable to many applications which
include border security, personalized security of buildings, educational institutes
and jails.
[00056] The foregoing description of the specific embodiments will so fully
reveal the general nature of the embodiments herein that others can, by applying
current knowledge, readily modify and/or adapt for various applications such

specific embodiments without departing from the generic concept, and, therefore, such adaptations and modifications should and are intended to be comprehended within the meaning and range of equivalents of the disclosed embodiments. It is to be understood that the phraseology or terminology employed herein is for the purpose of description and not of limitation. Therefore, while the embodiments herein have been described in terms of preferred embodiments, those skilled in the art will recognize that the embodiments herein can be practiced with modification within the spirit and scope of the embodiments as described herein.

1. A perimeter intrusion detection system comprises of:
plurality of optical laser source;
plurality of optical detector;
plurality of optical devices;
plurality of fiber optic cable 101 provided under ground, wherein one end of
the fiber optic cable 101 connected to the optical laser source and another end
of the fiber optic cable 101 connected to the optical detector;
wherein the fiber optic cable 101 capable of distributed acoustic sensing in a
form of vibrations;
wherein the optical detector configured to convert the sensed vibrations in to
electrical signal; and
a signal processing unit configured to process the electrical signal for
measuring strain changes at all points along the fiber optic cable 101 length
during said vibrations and for determining intrusion by comparing power of
processed electrical signal with a threshold and thereby generating an alarm
102 through a buzzer or a led or sending a warning message 103 to a concerned
number through wired or wireless mode based on the determined intrusion.
2. The perimeter intrusion detection system as claimed in claim 1, wherein the
perimeter intrusion control system further includes a control system 104
configured for displaying the determined intrusion by connecting the control
system 104 to an ethernet port 308 provided in the perimeter intrusion
detection system, wherein the determined intrusions are displayable in a form
of led indication and/or buzzer indication with zone mapping.

The perimeter intrusion detection system as claimed in claim 2, wherein the
perimeter intrusion control system further includes manual knobs 201 or push
buttons 301 provided for changing optical laser source power and detector
threshold.
The perimeter intrusion detection system as claimed in claim 3,wherein the
perimeter intrusion control system further includes a liquid crystal display
screen 302 provided for displaying the optical laser source power and the
detector threshold.
The perimeter intrusion detection system as claimed in claim 1, wherein the
vibration is detected when an intruder is near a sensor level where said
threshold is set.
The perimeter intrusion detection system as claimed in claim 1, wherein the
fiber optic cable 101 provided underground is capable of detecting both
underground and over ground distributed acoustic signals.
The perimeter intrusion detection system as claimed in claim 1, wherein the
fiber optic cable 101 utilizes mach-zehnder (MZ) interference principle for
distributed acoustic sensing.
The perimeter intrusion detection system as claimed in claim 1, wherein the
determined intrusion data are stored in a local server or a cloud based server for
retrieving when necessary and for scrutiny verification.
The perimeter intrusion detection system as claimed in claim 1, wherein the
determined events include digging, ground movement, vehicle passing and
human walking.
The perimeter intrusion detection system as claimed in claim 1, wherein said optical device includes optical coupler, wherein said optical coupler joined

with the fiber optic cable 101 and fiber joints covered using sleeves for protection.