English
Passive pyroelectric infrared detector referred to as passive infrared detector, in the field of electronic anti-theft, human body detector, passive infrared detector (referred to as PIR, Passive infra-red detectors) is widely used, because of its low price, stable technical performance and used in various fields.
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Radar microwave detector is a kind of detector that combines microwave receiving and transmitting equipment, and the working principle is based on the Doppler effect. The wavelength of microwaves is very short, between 1mm~1000mm, so it is easily reflected by objects. The Doppler effect occurs when the microwave signal encounters the reflection of a moving object, that is, the frequency of the reflected microwave signal and the transmitted wave signal will be slightly offset. At this point, it can be considered that the alarm has been generated.
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2018
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09
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