The sensing operation of a pyroelectric infrared sensor is based on the property or characteristic which becomes responsible for altering the polarization of its material in response to temperature changes. If one of the sensitive crystals detects change in infrared (increment or decrement) than the other sensitive crystal, the output gets triggered.Ī dome shaped plastic structure is normally placed over this sensitive crystal which acts as lens to focus the infrared light on the sensors. It actually houses two pyroelectic sensors for detecting moving objects. The dark portion of the metal where the IR sensitive crystal is housed, the sensitive crystal can detect the level of infrared in the surroundings. The PIR sensor module can be divided in to two parts an infrared sensitive crystal and the processing circuit. It can detect any infrared emitting object such as human beings or animals if it is the range of the sensor, or moves away from the range, or moves within the range of the sensor. PIR is an electronic sensor which detects the changes in the infrared light across certain distance and gives out an electrical signal at its output in response to a detected IR signal. PIR stands for Pyroelectic Infrared Radial Sensor or Passive Infrared Sensor. We will begin by understanding the actual PIR sensor unit which are installed inside standard PIR modules and learn its internal characteristics, pinout details and internal working details.
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