Analysis of the principle of laser radiation perimeter alarm system

Laser alarm system mainly consists of four parts: laser transmitter, laser receiver, alarm host and alarm output device.

Alarm host: According to the actual needs of the design of the zone, the alarm host that can control and receive the switch signal is selected and often installed in the central control room.

Transmitter: It is a special device capable of emitting a certain power laser. It is composed of a power supply unit, a laser emission controller, and a structure mounting rack.

Receiver: It is composed of power supply unit, laser controller and structure mounting rack.

working principle

Laser alarm system is active intrusion alarm system. Laser transmitters and receivers are installed in the vigilance area, and the results of their laser transmission and reception will form a laser fence in the prevention area. The transmitter can emit multiple parallel, invisible laser beams to receivers hundreds of meters away. After receiving the laser signal, the receiver forms a complete light path with the transmitter. When an intruder invades, the receiver It will block the laser reception in the light path, so as to achieve terminal alarm.

The laser perimeter perimeter alarm system is a branch of the anti-theft alarm system. The laser perimeter perimeter alarm system is mainly designed to prevent illegal people from illegally entering the designated zone from non-entrance without our permission, thus avoiding various potential Life and property are dangerous. The effective protection of the surrounding area provides timely warning of the overturning behavior. In the past, the laser-to-fire perimeter alarm system had a relatively small scope of application, mainly applied in some key locations, but with the update and development of technology, the laser-to-shot perimeter The alarm system is also continuously used in other industries, such as residential areas, banks, factories, etc., so the laser perimeter perimeter warning system is constantly expanding every year.

The laser radiation perimeter alarm system is generally a front-end detection device for output of a digital signal and then connected to an alarm host, and the other is to rely on the bus for management, and then connect the software installed on the microcomputer. As for front-end detection equipment, there are many more, such as electronic fences, leakage detection, vibration detection, infrared detection, laser radiation detection, microwave detection, etc. Among them, there are tension in the electronic fence, there are high-voltage electronic pulse, there are Electrostatic induction, etc. These are based on different physical principles to achieve the same detection purposes.

The laser perimeter perimeter alarm system generally has the following features:

Far detection distance, low false alarm rate

Compared with similar active detection systems, laser intrusion detection systems have significantly increased their adaptability to harsh climate conditions. The power density of the laser beam emission 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 and receiving laser beam is several times that of the infrared light emitting diode beam under the condition of the equivalent power device. The ability to penetrate the rain, snow, fog, and sand has greatly reduced the false alarm rate.

Strong anti-interference, no interference with other equipment

The laser alarm system has strong anti-electromagnetic interference, and it does not have any electromagnetic interference in the areas and equipment outside the laser beam propagation path. Since the laser divergence angle is small and the light beam is concentrated, the light beam is transmitted only in a closed circuit. When multiple groups of laser detectors are used for continuous transmission in a straight direction or transmission with a small turning angle, there is no mutual crosstalk phenomenon generated by the infrared ray detector, thereby eliminating this When the infrared detector produces a leak alarm. There is no light scattering or contamination of the surrounding environment.

Strong prevention

1) Continuous cross arming can be implemented without mutual interference problems.

2) Multiple independent beam planes and spatial three-dimensional distribution can be implemented.

Wide adaptability

1) The laser intrusion detector response time is adjustable between 10ms-500ms (the response time of the same type of active detector is between 50ms-500ms), and the response time can be adjusted according to the different field environments where the equipment is installed, and the environment can be adapted to a wider range.

2) It can work normally in -40°C~70°C environment without any electric heater.

3) The laser alarm system outputs a potential-free contact and is compatible with various other systems.

Positioning accuracy

The laser perimeter perimeter alarm system generally divides the deployment area into several major defense zones. Once there is a zone of alarm, the laser perimeter perimeter alarm system will immediately send alarm zones to the control panel, thus achieving The precise positioning function.

Linkage alarm

The laser perimeter perimeter alarm system has a linkage alarm function. Once an illegal person enters an area where we are armed, the laser perimeter perimeter alarm system generates linkages to perimeter monitoring and automatically turns to the alarm area. The center monitor screen is automatically switched to Alarm zone, the DVR automatically records the zone image and the alarm light on the spot.

Strong scalability

The laser perimeter perimeter alarm system uses an active laser multibeam detection device located in the perimeter of the prevention zone and is used in conjunction with the CCTV monitoring system in the defense zone. Therefore, the laser perimeter perimeter alarm system is highly scalable.

<br> <br> can range widely used in railways, subways, factories and mines, oil fields, oil depots, treasury, docks, libraries, banks, power stations, museums, galleries, schools, restaurants, farms, airports , prisons, military centers, armory, border defense, sea defense and other indoor and outdoor security precautions.

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Typical Applications---
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Various kinds of industrial application


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1 Motor
2 Shaft
3 Deflector
4 Mechanical Sea
5 Pressure Monitoring Hole
6 Pump Casing
7 Pressure Release Plug
8 Impeller


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