Passive infrared sensor

Typical residential/commercial PIR-based motion detector (PID).

A PIR motion detector used to control an outdoor, automatic light.

An indoor light switch equipped with PIR-based occupancy sensor[3]

A passive infrared sensor (PIR sensor) is an electronic sensor that measures infrared (IR) light radiating from objects in its field of view. They are most often used in PIR-based motion detectors.

单词	Passive infrared sensor
释义	Passive infrared sensor 英语百科 Passive infrared sensor A passive infrared sensor (PIR sensor) is an electronic sensor that measures infrared (IR) light radiating from objects in its field of view. They are most often used in PIR-based motion detectors.
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