This is in contrast to active sensors, which perform both the actions (emitting and detection). The term “Passive” in the PIR Sensor means that the sensor will not emit any infrared energy but rather detects infrared radiations emitted by other objects. Hence, they are employed in a variety of applications like Motion Detectors, Security Systems, Intruder Alert and so forth. Since the emitted energy is in the form of infrared radiation, whose wavelength is greater than that of our visible light, we humans cannot see those radiations.īut PIR Sensors are built to detect those infrared radiations. Passive Infrared Sensors, often referred to as PIR Sensors (also IR Motion Sensors and Pyroelectric Sensors), are Motions Detectors that basically detects the changes in Infrared Radiations emitted by a person.Įvery living and non-living thing which has a temperature greater than absolute zero will emit infrared radiations.
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