Comparative analysis of laser radiation and infrared radiation performance

The laser beam is an active intrusion detector. It consists of a laser transmitter and a laser receiver. The laser transmitter consists of a regulated power supply, a modulation circuit, a laser emission module, a laser angle adjustment device, and an external shield (outer casing). The laser receiver consists of a regulated power supply, a photosensitive receiver, an optoelectronic signal processor, a narrow-band filter lens, and an external shield.

The laser transmitter and the laser receiver constituting the laser beam are separately installed in the two shields and are used in face-to-face installation; the modulated one or more laser beams are formed between the laser transmitter and the laser receiver. A reliable protective surface, when the laser receiver reliably receives the modulated signal from the laser transmitter, the laser receiver determines that the laser intrusion detector is working properly, and maintains the current output signal unchanged; when the laser receiver does not receive it When the laser transmitter modulates the signal (the object between the laser transmitter and the laser receiver blocks the laser beam or the laser transmitter fails), the laser receiver determines that the laser intrusion detector is not working properly, and the laser receiver will The changed alarm signal is output to the alarm controller or related linkage device connected to the back end.

The infrared radiation is also an active detector. The infrared radiation is composed of an infrared transmitter and an infrared receiver. The infrared transmitter transmits a modulated infrared signal, and the infrared receiver receives the modulated infrared signal emitted by the infrared transmitter. . When the infrared receiver can reliably receive the modulated infrared signal from the infrared transmitter, the infrared receiver maintains a stable normally open/normally closed signal, and an invisible can be formed between the infrared transmitter and the infrared receiver. The height of the line of defense and the invisible line of defense is determined by the height of the infrared beam exit surface of the infrared transmitter and the infrared receiver; when there is an object between the infrared transmitter and the infrared receiver that blocks the infrared signal of the infrared transmitter, the infrared receiver does not receive the infrared signal. The infrared signal of the transmitter, the infrared receiver outputs a change alarm signal (from normally closed to open circuit in normal working state, and normally open to short circuit in normal operation). At present, the infrared radiation products on the market mainly have two, three, four beam specifications, the four beams are higher in height than the three beams, and the three beams are higher in height than the two beams;

Since infrared radiation uses 940nm infrared light as the detector light source, and infrared light belongs to diffused light, it needs to be equipped with an aspheric lens for optical processing on infrared radiation products to improve the detection distance of infrared radiation. The infrared radiation shooting outdoor detection distance on the market is nominally 250 meters. Although the infrared radiation can increase the detection distance by adding a convex lens, it cannot change the physical characteristics that the infrared light is easily interfered by the natural environment. Therefore, when the infrared radiation is used outdoors, it is sometimes subjected to strong winds, heavy rain, dense fog, strong sunlight, and automobiles. Headlights, smog and other effects can cause false positives.

In the intrusion alarm system, the detector is the key equipment of the whole system. The stability of the detector directly affects the user's trust in the whole system. A detector that is prone to false alarms will directly cause the user to abandon the application of the entire intrusion alarm system. . Therefore, many users in China who installed the infrared intrusion detection and alarm system in the early days have abandoned the equipment after the equipment is installed for a period of time, and the whole system is ineffective. Therefore, how to provide a highly stable intrusion detector for the market is an urgent problem for the entire security industry.

The Viandas intelligent laser beam uses laser as the detector light source, and uses the characteristics of high concentration of laser energy, single frequency, good directionality and consistent phase. The Viandas laser beam is completely solved from the initial design. All the technical defects exposed by infrared radiation; Viandas laser has a high degree of intelligence and superior applicability. Compared with infrared radiation, it has the following technical advantages:

1. The stability of laser beam shooting is much higher than that of infrared radiation. Due to the strong anti-interference ability of the laser, the stability of the laser is very good and there will be no false alarms;

2, laser beam can achieve ultra-long-distance detection, outdoor work can reach 5000 meters;

3. The laser is resistant to violent damage and natural aging. The laser beam is made of 304 stainless steel casing, and the infrared beam is made of ABS or PC plastic casing;

4, laser beam each beam independent identity encryption and decryption (patent), the same detector will not form a beam covering and interference at any working distance, can accurately identify each beam at any distance, and infrared radiation Accurate recognition of each beam is not possible.

5. When the laser is fired, the switch can output the changed switch signal and level signal at the same time, while the infrared beam can only output a single switch signal.

The Viandas intelligent laser beam has obvious technical advantages compared to infrared radiation. Therefore, once the product is launched, it is fully recognized by the market and is widely used in prison detention centers, airports, petroleum and petrochemical, railway, electric power, finance. , museums, national defense and other key safety protection sites, and quickly promoted by local agencies, schools, factories, communities, with the widespread use and application of Viandas laser radiation, I believe that in the near future, Viandas laser will shoot It replaced the infrared radiation that has been popular in the market for nearly 30 years and became a detector for the perimeter intrusion alarm system.