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Infrared alarm

April 25, 2024
Infrared alarms are divided into two types: active and passive. The active infrared alarm is an alarm device that actively emits infrared rays. When the infrared beam hits an obstacle, it will bounce back and be received by the probe of the alarm device. If the probe detects that the infrared is stationary, that is, it continuously emits red lines and continues to bounce, the alarm will not alarm. When a moving object violates this invisible red line, the probe will detect an abnormality and an alarm will be issued.

One of the functions of passive alarms is to emit infrared light. Physics tells us that when the temperature of an object is higher than 0K, it will emit infrared rays, in other words, any object can emit infrared rays. The principle behind it, passive alarm and active is the same.

The infrared alarm device is sensitive to temperature, and the higher the temperature is, the stronger the infrared ray radiated from the object, and when there is radiation in the environment that is higher than the background intensity, the anti-alarm is triggered.
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