Active infrared radiation detectors as outdoor equipment must itself have a certain anti-jamming ability to outdoor environmental factors. In fact, such as sunlight, ultraviolet rays, harsh weather, plants, small animals, radio frequency, electromagnetic, etc. are all interference detectors. the elements of. To do this, choose a high-quality, professional infrared radio product that must be evaluated for some of its technical features:
· First of all, for product stability, while controlling costs, it is necessary to ensure the maximum energy output and reception at both ends of the device. The latest optical technology combining the crystal spherical lens and Fresnel lens technology should be adopted.
In order to resist the interference of the sun's ultraviolet rays or strong light, the detector housing must be a special filter material and adopt optical mold technology. The easiest way to detect this high-quality mold process is to see if the image on the cover is deformed and if there are burrs on the edges. This is exactly the same reason as optical lenses. The deformed objects are caused by distorted optics, and when used on a detector It will cause energy loss;
In order to resist stray light interference, in addition to the requirements of the optical housing, the excellent detector must also use the same filter material and process on the optical components inside the receiving end;
· To minimize the impact of bad weather conditions on the attenuation of infrared light, the detector must have a margin of at least 10 times the distance (6 times for the domestic CCC standard and 10-20 times for the international community);
· In order to meet the requirements of the outdoor environment, the product should be equipped with anti-frost and condensation technology. The enclosure must have a frost-proof, dew-condenser and groove design, and the heater accessories used in the low-temperature environment can be selected. At the same time, the shell and threading hole must be used. Professional waterproof technology such as rubber seals, with super waterproof, pest control, dust-proof performance;
In order to facilitate the important daily inspection and maintenance of the users of the perimeter system, it is required to be able to directly observe the various working or fault conditions of the detector without opening the enclosure, which will greatly benefit the system maintenance;
• Since the size of branches, leaves or birds is relatively small compared to the human body, generally only one light beam can be blocked. In order to eliminate false alarms caused by plant or small animal activity interference, the equipment must use at least two beams, and in order to ensure dual beam The effectiveness of the detection, the optical structure design requires that the distance between the center of the beam up and down should not be less than 70mm; so can use the characteristics of the multi-beam detector must be blocked at the same time, can effectively prevent false positives;
· With adjustable function of shading time, also interrupt the infrared light, the time period for the deciduous or flying birds is usually smaller than the time for people to climb the wall, because the speed is fast. Through this measure, the perimeter system can effectively distinguish false alarms;
· To facilitate stacking installation or to avoid interference, a good product series should have both ordinary fixed frequency and digital variable frequency options;
· Calibration of the optical axis of the beam is very important. The high-quality beam-shooting products generally have more than two of the industry's existing techniques for sensitivity voltage calibration, LED indicators, and sound calibration. At the same time, for on-site installation and future routine maintenance, Now all require the use of an integrated sight to prevent loss;
According to the survey data, more than 50% of the incidental radiation failures are caused by lightning or surges. In order to prevent direct damage to electrical equipment caused by lightning strikes and false alarms, it is very important for the lightning protection product to have a lightning protection index. Of course, the more important thing is that the perimeter system loop must also have lightning protection, anti-magnetic and RF interference protection. Grounding design.
· First of all, for product stability, while controlling costs, it is necessary to ensure the maximum energy output and reception at both ends of the device. The latest optical technology combining the crystal spherical lens and Fresnel lens technology should be adopted.
In order to resist the interference of the sun's ultraviolet rays or strong light, the detector housing must be a special filter material and adopt optical mold technology. The easiest way to detect this high-quality mold process is to see if the image on the cover is deformed and if there are burrs on the edges. This is exactly the same reason as optical lenses. The deformed objects are caused by distorted optics, and when used on a detector It will cause energy loss;
In order to resist stray light interference, in addition to the requirements of the optical housing, the excellent detector must also use the same filter material and process on the optical components inside the receiving end;
· To minimize the impact of bad weather conditions on the attenuation of infrared light, the detector must have a margin of at least 10 times the distance (6 times for the domestic CCC standard and 10-20 times for the international community);
· In order to meet the requirements of the outdoor environment, the product should be equipped with anti-frost and condensation technology. The enclosure must have a frost-proof, dew-condenser and groove design, and the heater accessories used in the low-temperature environment can be selected. At the same time, the shell and threading hole must be used. Professional waterproof technology such as rubber seals, with super waterproof, pest control, dust-proof performance;
In order to facilitate the important daily inspection and maintenance of the users of the perimeter system, it is required to be able to directly observe the various working or fault conditions of the detector without opening the enclosure, which will greatly benefit the system maintenance;
• Since the size of branches, leaves or birds is relatively small compared to the human body, generally only one light beam can be blocked. In order to eliminate false alarms caused by plant or small animal activity interference, the equipment must use at least two beams, and in order to ensure dual beam The effectiveness of the detection, the optical structure design requires that the distance between the center of the beam up and down should not be less than 70mm; so can use the characteristics of the multi-beam detector must be blocked at the same time, can effectively prevent false positives;
· With adjustable function of shading time, also interrupt the infrared light, the time period for the deciduous or flying birds is usually smaller than the time for people to climb the wall, because the speed is fast. Through this measure, the perimeter system can effectively distinguish false alarms;
· To facilitate stacking installation or to avoid interference, a good product series should have both ordinary fixed frequency and digital variable frequency options;
· Calibration of the optical axis of the beam is very important. The high-quality beam-shooting products generally have more than two of the industry's existing techniques for sensitivity voltage calibration, LED indicators, and sound calibration. At the same time, for on-site installation and future routine maintenance, Now all require the use of an integrated sight to prevent loss;
According to the survey data, more than 50% of the incidental radiation failures are caused by lightning or surges. In order to prevent direct damage to electrical equipment caused by lightning strikes and false alarms, it is very important for the lightning protection product to have a lightning protection index. Of course, the more important thing is that the perimeter system loop must also have lightning protection, anti-magnetic and RF interference protection. Grounding design.
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