The principle of infrared detector

The wireless infrared detector is an intelligent dual-element detector developed by international advanced digital processing technology. It mainly uses dual passive infrared pyroelectric sensor and special optical analysis and judgment, with microcomputer digital signal processing. Perfect temperature compensation, unique anti-false alarm algorithm, low power consumption, stable performance, strong anti-interference, is a cost-effective wireless infrared anti-theft detector.

1. Turn the power switch on the left side of the detector to the bottom. At this time, the detector power is turned on, the alarm indicator on the face shell lights up for about 3 seconds, and the wireless signal is also emitted. After 3 seconds, the detector enters the stable program. The time is about 50 seconds, the stabilization time is up, and the next round of detection and monitoring begins.

2. When someone enters the detection range of the detector, the detector alarm indicator lights up and a wireless signal is emitted.

3. As long as the alarm is issued, it will wait for 50 seconds before entering the next round of alarm; if the detector is always in the monitoring state, the alarm will be generated immediately whenever someone enters the monitoring area.

In an infrared detector, a thermoelectric element detects the presence or movement of a human body and converts the output signal of the thermoelectric element into a voltage signal. Then, waveform analysis is performed on the voltage signal. Thus, the detection signal is output only when a waveform generated by the human body is detected by waveform analysis. For example, the voltage signal is amplified in two different frequency ranges, and the amplified signal is used to identify signals caused by the human body. Thus, it is possible to prevent a type of noise such as popcorn noise of a thermoelectric element from being generated by the human body and being prepared for detection.

The infrared detector comprises an infrared emitter, a receiver, and a signal processor. The signal output end of the signal processor is connected to the infrared emitter via an infrared emitting circuit; the signal input end is connected to the infrared receiver via an infrared receiving circuit, and the feedback signal thereof The output is connected to a peripheral control circuit.

The technology uses a micro-single chip as a signal processor to generate a coded signal, drives an infrared emitter to emit an infrared signal with a coded signal, and detects a reflected signal processed by the amplifier circuit in real time, and the coded signal can ensure multiple sensors of the same model simultaneously Work in the same place without mutual interference. Moreover, the working frequency is consistent, the reliability is high, and the power consumption is small.