Pyroelectric infrared sensor is an electronic sensor that measures infrared (IR) light radiating from objects in its field of view. It is often referred to as PIR, PIR sensor, passive infrared, Pyroelectric or IR motion sensor. The main material including PZT(piezoelectric ceramic transducer), FET(field-effect tube), infrared filter. It detects the infrared radiating from human body, transfers the infreared signal to electrical signal, so that it can detect general movement. As the result, PIR sensor is most used in motion detectors, all the components has been widely used in toys, automatic lighting, switches, household appliances, medical, industry, security alarm products, military and other fields.
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