Distributed fiber optic fence perimeter security vibration warning and monitoring system

A distributed fiber optic vibration sensing system based on scattered light interference technology continuously and in real-time monitors various disturbances transmitted to the fiber optic directly acting on the fiber optic or through load-bearing objects such as soil cover and fences. The collected disturbance data is analyzed, processed, and intelligently identified by the host to identify different types of external interference, such as climbing fences and walls, walking and digging in fortified areas, and potential damage to fiber optic carriers. This achieves system warning or real-time alarm and positioning, thereby achieving the purpose of warning and monitoring the threat behavior of invading the perimeter of fortified areas and internal core areas.

advantage

The vibration fiber optic alarm unit is equipped with a human-machine interaction system, which can modify and set all parameters of the warning unit through this system, and can clearly indicate the operating status of the warning unit and the alarm situation in the defense zone.

The fiber optic alarm signal in the vibration fiber optic cable perimeter alarm system adopts fuzzy control algorithm for automatic adjustment, which can adapt to a wide range of light intensity changes without manual adjustment, and on-site construction is simple and convenient. Adopting high-performance processors enables complex data operations, enriches data processing methods, reduces false alarms, and increases alarm rates.

The vibration optical cable alarm unit has a polarization state correction circuit for optical signals, which can effectively solve false alarms and missed alarms caused by polarization state changes in the optical path, and the system operates more stably and reliably.

Product features

The vibration fiber optic cable perimeter alarm system uses ordinary communication fiber optic cables as vibration fiber optic sensors. The sensors are passive and will not produce electromagnetic interference or radiation, nor will they generate electric sparks. They are suitable for petroleum and petrochemical security, airport security, border line security, prison security, and substation security.

The vibration fiber optic cable perimeter alarm system has a length of ≤ 2km for each defense zone. A vibration fiber optic cable perimeter protection system can achieve 8000 defense zones, making it suitable for large-scale fiber optic perimeter alarm systems.

The cable laying method of the vibration fiber optic cable perimeter alarm system is very suitable for irregular boundaries.

The vibration fiber optic cable perimeter alarm system uses communication fiber optic cables as the vibration fiber optic fence, which will not produce electric shock effects like electronic fences and has high safety.

The vibration fiber optic cable perimeter alarm system has high alarm sensitivity and adjustable sensitivity. Not only suitable for hanging nets and burying walls, but also suitable for underground installation, with high concealment.

operational principle

The vibration fiber optic cable alarm processing unit sends coherent mode laser to the sensing fiber optic cable, which is installed on the iron wire mesh or other perimeter fiber optic fences. When illegal intruders climb, climb or interrupt the iron wire mesh, it will cause vibration, which will change the transmission mode of light. Part of the characteristics of the transmitted light in the vibration fiber optic cable will change. After signal acquisition and analysis, the vibration fiber optic cable alarm processing unit can detect changes in the characteristics of the light (i.e. attenuation, phase, wavelength, polarization, mode field distribution, and propagation time). By analyzing the characteristics of the changing waveform through software, the true situation of the event can be distinguished, thereby achieving the effect of "intrusion pattern recognition", issuing alarm signals, and realizing the fiber optic alarm function.

Installation method

Iron installation method: When laying vibration sensing optical cables on fences, the following methods can be selected according to the different fences: linear, parallel, and S-shaped. Linear laying: The vibration sensing optical cable should be laid at a height of about 1.5 meters from the ground of the iron mesh. The vibration sensing optical cable should be tightly tied to the fence, and the binding strength should be such that the optical cable does not deform. Stainless steel ties should be used to tie it every 50 centimeters.

Anti chiseling wall installation method: The vibration sensing optical cable is laid along the wall, and each vibration sensing optical cable can prevent walls up and down by 50cm. Multiple vibration sensing optical cables can be laid on the wall to prevent personnel from chiseling into the wall. Vibration sensing optical cables are fixed to the wall with clips every 50cm

Installation method of buckle net: To prevent illegal intruders from crossing the wall and entering, buckle net can be installed on the top of the wall to increase the intensity of vibration and sensing area. When fixing the sensing optical cable on the buckle net, attention should be paid to fixing the sensing optical cable on the top of the buckle net outside the wall.

Distributed vibration fiber optic technology is widely used in multiple fields due to its unique advantages:

1. Perimeter security: Whether it is factories, schools, residential areas, or important facilities, distributed vibration optical fibers can serve as a powerful means of perimeter security. Once an illegal intruder triggers the fiber optic, the system will immediately issue an alarm, effectively ensuring security.

2. Pipeline monitoring: For important infrastructure such as oil and gas pipelines and water conservancy pipelines, distributed vibration optical fibers can monitor the vibration situation of pipelines in real time, detect potential leaks or damage in a timely manner, and ensure the safe operation of pipelines.

3. Railway protection: The railway line is long and the terrain is complex, and traditional security measures are difficult to cover all areas. Distributed vibration optical fibers can be laid along railway lines to monitor the safety status in real-time and ensure the safety of train operation.

4. Border protection: Traditional security measures are difficult to protect against long border lines and complex terrain. Distributed vibration optical fibers can be used to deploy defenses along border lines, detect cross-border behavior in a timely manner, and safeguard national security.

In addition, distributed vibration optical fibers can also be applied in various fields such as bridge monitoring, power line protection, etc., to ensure the safety of various facilities.