Fiber Sensing Perimeter Monitoring System
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Fiber Sensing Perimeter Monitoring System

The optical fiber sensing perimeter monitoring system can be used for the perimeter intrusion protection of key areas such as borders, airports, warehouses, factories, high-speed rail stations, and theft detection of oil pipelines and gas pipelines. The system has simple structure, high reliability, and strong environmental adaptability. It only needs single-ended power supply to achieve long-distance detection. At the same time, the system can work with remote video surveillance systems and other equipment, to avoid blind spots effectively.

Introduce

The optical fiber sensing perimeter monitoring system can be used for the perimeter intrusion protection of key areas such as borders, airports, warehouses, factories, high-speed rail stations, and theft detection of oil pipelines and gas pipelines. The system has simple structure, high reliability, and strong environmental adaptability. It only needs single-ended power supply to achieve long-distance detection. At the same time, the system can work with remote video surveillance systems and other equipment, to avoid blind spots effectively. It plays the role of early detection of intrusions, and can be linked with remote video equipment for detailed inspection and verification to improve the detection probability of targets. The system can work all-days (24 hours) and all weathers. It can work without being affected by meteorological conditions such as fog, snow, rain, wind, etc; quasi-passive detection, the laser is only transmitted in the optical fiber, and it does not emit electromagnetic signals. Well, it has excellent electronic countermeasures.

Optical fiber sensing perimeter monitoring system detects the location of the intrusion, by detecting the optical fiber vibration which caused by the intruder. When a certain position on the optical fiber line is disturbed due to intrusion, the refractive index of the corresponding position of the optical fiber will change, which will cause the light phase to change. Due to interference, the change in phase will cause the backscattered light intensity change. When changes occur, the time at which these light intensities change will correspond to where the intrusion occurred.

Technical indexes

a) Main functions:

1) Laying method: hanging at the net, buried, etc .

2) Detection object: People who climbing over the net, breaking barbed wire, which causing vibrations. People, animal or vehicles those pass through the area;

3) Detection and location: It has the function of alarming and locating the targets, such as invading persons, animals, and vehicles;

4) Alarm output: The alarm information is sent to the monitoring center through the network in a format message;

5) Information display mode: display in two ways: original information and text information.

b) Detection performance:

1) Detection probability: ≥90%;

2) Target positioning error: ≤50m;

3) Alarm trigger time T: ≤10s;

4) Maximum distance of single system: 30km;

5) False alarm: 1 time / km / 5 days.

c) Reliability:

MTBF (θ1)-Mean Time Between Failures ≥ 1000 hours

(MTBCF terminal-Mean time between serious failures on terminal ≥ 3000 hours, optical cable life is 10 years);

d) Testability:

1) With real-time detection system working status

2) When the optical cable is damaged or broken, it has an alarm function.

e) Supportability:

Test equipment, repair tools, spare parts (including spare cables), random materials.

f) Electromagnetic compatibility:

The system works automatically.

g) Security:

Under normal operating conditions, the system's electronic equipment does not endanger the safety of equipment and workers, during the power-on process; the operation interface has an error-proof design, the key instructions have protective measures; the equipment is installed firmly and reliably during the transfer, transportation, and use Can guarantee the safety of equipment and workers.

h) Conditions:

Power supply AC220V, power consumption ≤200W。

Storage temperature:-40°~70°;

Working temperature: -40 ° ~ 55 ° (outdoor unit), -25 ° ~ 55 ° (processing terminal).

Installation layout

When applied to the perimeter prevention field, the sensing optical cable is mainly laid on the fence, barbed wire and other hanging methods. Special applications can be used for roof and fence installation.

For anti-theft detection such as pipelines, the optical cable and the pipeline are buried at the same time. The system locates the location and identifies the thefting behavior, by detecting vibration signals caused by the excavation.

laying on the fence

Typical application

Frontier defense application test:

Condition

The detection of people who crossing the barbed wire, under the condition of 14km of sensor optical cable and 5 to 6 level winds.

Actual test indicators:

Detection probability 97%, positioning accuracy 36m, false alarm 1 time / km / 10 days

High-speed railway station of the Harbin Railway Bureau test:

Condition

7km of sensor fiber optic cables are arranged, which are linked with video surveillance to provide perimeter protection for the station area of a high-speed railway station

Actual test indicators:

98% detection probability, positioning accuracy: ± 15m, false alarm: ≤1 time / km / 7 days.

Frontier defense application test:

Schematic diagram of sensor optical cable edge defense

Frontier defense application test:

Real photos of sensor optical cable edge defense

High-speed railway station of the Harbin Railway Bureau test:

Condition

7km of sensor fiber optic cables are arranged, which are linked with video surveillance to provide perimeter protection for the station area of a high-speed railway station.

Actual test indicators:

98% detection probability, positioning accuracy: ± 15m, false alarm: ≤1 time / km / 7 days.

High-speed railway station of the Harbin Railway Bureau test:

Schematic diagram of sensor fiber optic cable station

High-speed railway station of the Harbin Railway Bureau test:

Real photos of sensor fiber optic cable station

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