The working principle of passive infrared alarm:
The core component of the passive infrared device is an infrared detector (infrared sensor). Through the cooperation of the optical system, it can detect the change of thermal radiation in a certain stereoscopic space. When there are no moving objects such as human bodies in the prevention area, since all the background objects (such as walls, furniture, etc.) have relatively small infrared radiation energy at room temperature and are basically stable, all of them cannot trigger an alarm. When the human body walks in the detection area, it will cause changes in the infrared thermal radiation energy. The infrared sensor converts the change in the infrared thermal radiation energy received between the active human body and the background object into a corresponding electrical signal. After appropriate processing, it sends it to the alarm controller and issues an alarm signal.
The infrared sensor's detection wavelength range is 8~14μm. Since the human body's infrared radiation wavelength is within this detection wavelength range, it can better detect the active human body. The optical system in front of the infrared sensor can reflect the infrared radiation energy from multiple directions through the reflector or the special lens and all concentrate on the infrared sensor. In this way, on the one hand, the thermoelectric conversion efficiency of the infrared sensor can be improved, and on the other hand it also has the effect of lengthening the detection distance and enlarging the vigilance field of view.
Passive infrared alarm installation using points:
1. Passive infrared detectors are space-controlled detectors. It does not radiate any energy to the outside world itself. Its power consumption is small, and ordinary batteries can maintain long-term work.
2. Due to the poor penetration of infrared rays, there should be no obstructions in the monitoring area, otherwise it will cause a "blind area" to be detected.
3. In order to prevent false alarms, the passive infrared detector probe should not be aimed at any object whose temperature will change rapidly, especially the heating element.
4, in the choice of installation location, the detector should have the maximum range of alert, so that all possible intruders can be in the alert range, so that all possible intruders can be in the infrared alert beam range. The activity of the intruder is conducive to laterally crossing the beam zone, which can increase the detection sensitivity.
5. The product types include wall-mounted and ceiling-mounted passive infrared detectors.
6. Since the passive infrared detector works in a passive manner, several installations in the same room will not generate interference.
The core component of the passive infrared device is an infrared detector (infrared sensor). Through the cooperation of the optical system, it can detect the change of thermal radiation in a certain stereoscopic space. When there are no moving objects such as human bodies in the prevention area, since all the background objects (such as walls, furniture, etc.) have relatively small infrared radiation energy at room temperature and are basically stable, all of them cannot trigger an alarm. When the human body walks in the detection area, it will cause changes in the infrared thermal radiation energy. The infrared sensor converts the change in the infrared thermal radiation energy received between the active human body and the background object into a corresponding electrical signal. After appropriate processing, it sends it to the alarm controller and issues an alarm signal.
The infrared sensor's detection wavelength range is 8~14μm. Since the human body's infrared radiation wavelength is within this detection wavelength range, it can better detect the active human body. The optical system in front of the infrared sensor can reflect the infrared radiation energy from multiple directions through the reflector or the special lens and all concentrate on the infrared sensor. In this way, on the one hand, the thermoelectric conversion efficiency of the infrared sensor can be improved, and on the other hand it also has the effect of lengthening the detection distance and enlarging the vigilance field of view.
Passive infrared alarm installation using points:
1. Passive infrared detectors are space-controlled detectors. It does not radiate any energy to the outside world itself. Its power consumption is small, and ordinary batteries can maintain long-term work.
2. Due to the poor penetration of infrared rays, there should be no obstructions in the monitoring area, otherwise it will cause a "blind area" to be detected.
3. In order to prevent false alarms, the passive infrared detector probe should not be aimed at any object whose temperature will change rapidly, especially the heating element.
4, in the choice of installation location, the detector should have the maximum range of alert, so that all possible intruders can be in the alert range, so that all possible intruders can be in the infrared alert beam range. The activity of the intruder is conducive to laterally crossing the beam zone, which can increase the detection sensitivity.
5. The product types include wall-mounted and ceiling-mounted passive infrared detectors.
6. Since the passive infrared detector works in a passive manner, several installations in the same room will not generate interference.
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