How does PIR detection work?
PIR- (Passive Infra Red) is a passive sensing technology, meaning that the detector does not emit any IR radiation. The radiation source is the human body and all the objects in the field of view of the detector, which emit thermal heat radiation. The thermal energy reaches the PIR sensor via optical means, such as lenses or mirrors, which are structured in segments. A PIR sensor consists typically of dual IR (Infra Red) elements that convert IR energy to voltage. Each segment in the optics, with 2 dual sensing elements in the sensor, creates two fields of view collecting the IR radiation. The field of view of the detector is determined by the pattern and the amount of the segments in the optics.
