As an outdoor device, the active infrared detector must have certain anti-interference ability against outdoor environmental factors. In fact, such as sunlight ultraviolet rays, bad weather environment, plants, small animals, radio frequency, electromagnetic, etc. are interference detectors. the elements of. Therefore, to choose a high-quality professional infrared beam product, some of its technical characteristics must be assessed:

First of all, for product stability, while controlling the cost, the maximum energy output and reception at both ends of the equipment should be ensured. The latest optical technology combining crystal spherical lens and Fresnel lens technology should be adopted;

In order to resist the interference of sunlight or strong light, the detector housing must be made of special materials for filtering stray light and adopt optical mold technology. The simplest detection method of this high-quality mold process is to observe whether the reflected image on the outer cover is deformed and whether there are burrs on the edge. In fact, the principle is the same as the optical lens. The deformed object is caused by the distorted optical component, and when it is used on the detector Will cause energy loss;

In order to resist stray light interference, in addition to the requirements for the optical housing, a good detector must also use the same filter materials and processes on the optical components inside the receiving end;

In order to minimize the impact of the bad weather environment on the attenuation of infrared light, the detector must have a margin of at least 10 times the distance (the domestic CCC standard is 6 times, and the international standard is generally 10-20 times);

In order to meet the requirements of the outdoor environment, the product should have anti-frost and condensation technology, the shell must have an anti-frost and condensation groove structure design, and there are optional heater accessories used in low temperature environments; at the same time, the shell and the threading hole must be made of rubber Professional waterproof technology such as seals, with super waterproof, insect-proof and dust-proof performance;

In order to facilitate the important daily inspection and maintenance of the perimeter system users, it is required to directly observe the various working or fault states of the detector without opening the shell, which will greatly benefit the system maintenance;

Because the volume of branches, fallen leaves or birds is relatively small compared to human body, generally only one beam can be blocked. In order to eliminate the false alarm caused by the interference of plants or small animals, the equipment must use at least double beams, and to ensure double beam detection The optical structure design requires that the distance between the upper and lower beam centers should not be less than 70mm; in this way, the feature of multi-beam detectors that must be blocked at the same time can be used to alarm, which can effectively prevent false alarms;

With the adjustable function of shading time, it also cuts off infrared light. The interception time period of fallen leaves or birds is usually shorter than that of people climbing walls, because the speed is faster than the former. Through this measure, the perimeter system can effectively distinguish false positives;

In order to facilitate stacking installation or avoid interference, a good product series should have two options: ordinary fixed frequency and digital variable frequency;

The optical axis calibration of the beam is very important. High-quality beam products generally have more than two of the current industry's current sensitivity voltage calibration, LED indicator light, sound calibration and other technologies; at the same time, to facilitate on-site installation and future routine maintenance, now All require the use of an integrated sight to prevent loss;

According to survey data, more than 50% of incidents of beam failure are caused by lightning or power surges. In order to prevent electrical equipment damage and false alarms caused by direct lightning strikes, the lightning protection index of the radio product itself is very important. Of course, it is more important that the perimeter system loop must also have lightning protection, anti-magnetic, and anti-radio frequency interference. Grounding design.