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2. Passive infrared sensor - Wikipedia

   en.wikipedia.org/wiki/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. PIR sensors are commonly used in security alarms and automatic lighting applications. PIR sensors detect general movement, but do not give ...

3. Motion detector - Wikipedia

   en.wikipedia.org/wiki/Motion_detector

   For motion to be detected, both sensors must trip together. [citation needed] This lowers the probability of a false alarm since heat and light changes may trip the (passive infrared) PIR but not the microwave, or moving tree branches may trigger the microwave but not the PIR. If an intruder is able to fool either the PIR or microwave, however ...

4. Infrared detector - Wikipedia

   en.wikipedia.org/wiki/Infrared_detector

   An infrared detector is a detector that reacts to infrared (IR) radiation. The two main types of detectors are thermal and photonic (photodetectors). The thermal effects of the incident IR radiation can be followed through many temperature dependent phenomena. [2] Bolometers and microbolometers are based on changes in resistance.

5. Security alarm - Wikipedia

   en.wikipedia.org/wiki/Security_alarm

   A passive infrared sensor used to detect motion. The passive infrared (PIR) motion detector is one of the most common sensors found in household and small business environments. This sensor does not generate or radiate energy; it works entirely by detecting the heat energy given off by other objects. PIR sensors identify abrupt changes in ...

6. Talk:Passive infrared sensor - Wikipedia

   en.wikipedia.org/wiki/Talk:Passive_infrared_sensor

   1) "Strictly speaking, individual PIR sensors do not detect motion; rather, they detect abrupt changes in temperature at a given point using the Infrared radiation level" 2) "Moving objects of identical temperature, however, will trigger a detection because that is the sensor's job, to detect motion. It detects motion regardless of temperature.[4]

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