About infrared (IR) sensors An infrared (IR) sensor emits and detects IR radiation to measure heat and detect motion. These IR sensors can be broadly classified as passive IR (PIR) sensors and active IR (AIR) sensors. PIR sensors only measure IR radiation, while AIR sensors measure and emit IR radiations. IR sensors are integrated with different devices used in surveillance, automobiles, testing, detection, and measurement. They are used to detect radiation invisible to human eyes. IR sensors, including cooled and uncooled detectors, are extensively used in the residential, comme...more >>
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