Analysis of the principle of laser radiation perimeter alarm system

The basic composition of the laser radiation warning system is mainly composed of laser transmitter, laser receiver, alarm host and alarm output device.
Alarm host: According to the actual needs of the zone design, an alarm host capable of controlling and receiving the switch signal is selected, which is often installed in the central control room.

Transmitter: It is a special equipment capable of transmitting a certain power laser. It is composed of a power supply unit, a laser emission controller and a structural mounting frame.
Receiver: It consists of a power supply unit, a laser controller and a structural mounting frame.
Working principle The laser radiation warning system is an active intrusion alarm system. Laser transmitters and receivers are installed in the alert area, and the result of their laser transmission will form a laser fence in the guard area. The transmitter can emit multiple parallel invisible laser beams to a receiver 100 meters away. After receiving the laser signal, the receiver forms a complete optical path with the transmitter. When an intruder invades, It will block the laser reception in the optical path, thus achieving terminal alarm.
The laser radiation perimeter alarm system is a branch of the burglar alarm. The laser radiation perimeter warning system is mainly to prevent illegal personnel from illegally entering the designated zone without our permission, thus avoiding various potential Life and property are dangerous. Effective protection of the surrounding area, providing timely warning of the over-the-counter behavior; the previous application range of the laser perimeter perimeter warning system is relatively small, mainly applied in some key places, but with the update and development of technology, the laser radiation perimeter The alarm system is also constantly being used in other industries, such as residential areas, banks, factories, etc., so the laser perimeter perimeter alarm system is constantly expanding every year.
The laser radiation perimeter warning system is generally the front-end detection device of the switch signal output connected to the alarm host, and the other is to rely on the bus for management, and then connect the software installed on the microcomputer. As for the front-end detection equipment, there are more, such as electronic fences, leak detection, vibration detection, infrared detection, laser beam detection, microwave detection, etc. Among them, there are tensions in the electronic fence, there are high-voltage electronic pulses, there are Static induction, etc. These are based on different physical principles to achieve the same detection purpose.
Characteristics of laser radiation perimeter warning system
The detection distance is far, and the false alarm rate is low. Compared with the active detection system of the same type , the laser intrusion detection system has significantly improved adaptability to harsh weather conditions. The power density of the laser beam is large, the divergence angle is small, the beam is concentrated, and the directivity is good. Under the condition of using the same power device, the power density of the target receiving laser beam is several times that of the infrared light emitting diode beam at 100 meters. The ability to penetrate rain, snow, fog, and sand is strong, which greatly reduces the false positive rate.
Strong anti-interference, no interference to other equipment. The laser alarm system itself is highly resistant to electromagnetic interference, and does not have any electromagnetic interference to areas and equipment outside the warning laser beam propagation path. Since the laser divergence angle is small, the light beam is concentrated, and the light beam is transmitted only in a closed circuit. When multiple sets of laser detectors are used for continuous transmission in a straight line direction or a small corner angle transmission, there is no crosstalk phenomenon generated by the infrared detector, thereby eliminating this phenomenon. A leak alarm generated by an infrared detector. There is no light scattering or pollution to the surrounding environment.
Strong precautions 1) Continuous cross-arming can be implemented without mutual interference.
2) Multiple independent beam planes and spatial stereoscopic distributions can be implemented.
Wide adaptability 1) The response time of the laser intrusion detector is adjustable from 10ms to 500ms (the response time of the same type of active detector is between 50ms and 500ms), and the response time can be adjusted according to the different on-site environment of the equipment installation. wide.
2) It can work normally in the environment of -40 ° C ~ 70 ° C, without any electric heater.
3) The laser alarm system output is a potential-free contact and is compatible with various other systems.
Positioning accurate laser shooting perimeter warning system will generally divide the arming area into several large areas. Once there is an alarm in a certain area, the laser perimeter perimeter alarm system will immediately send the alarm zone to the alarm host. Thereby achieving precise positioning.
The linkage alarm laser has a linkage alarm function for the perimeter warning system. Once an illegal person breaks into the area we are armed, the laser perimeter perimeter alarm system will interlock with the surrounding monitoring, and automatically turn to the alarm area. The center monitor screen automatically Switch to the alarm zone, the DVR will automatically record the zone image, and the site alarm will be watched.
The extended strong laser radiation perimeter warning system adopts active laser multi-beam detection equipment to be installed in the periphery of the prevention area, and is used together with the prevention area closed-circuit television monitoring system, so the laser radiation perimeter warning system has strong scalability.
The scope of use can be widely applied in railways, subways, factories and mines, oil fields, oil depots, treasury, docks, libraries, banks, power stations, museums, exhibition halls, colleges, restaurants, farms, airports, prisons, military sites, Indoor and outdoor security precautions such as armory, border defense, and coastal defense.
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