PIR Motion sensors
What are PIR Sensors?
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 information on who or what moved. For that purpose, an imaging IR sensor is required.
PIR sensors are commonly called simply "PIR", or sometimes "PID", for "passive infrared detector". The term passive refers to the fact that PIR devices do not radiate energy for detection purposes. They work entirely by detecting infrared radiation (radiant heat) emitted by or reflected from objects.
How PIRs Work?
PIR sensors are more complicated than many of the other sensors because there are multiple variables that affect the sensor's input and output.
The PIR sensor itself has two slots in it, each slot is made of a special material that is sensitive to IR. The lens used here is not really doing much and so we see that the two slots can 'see' out past some distance (basically the sensitivity of the sensor). When the sensor is idle, both slots detect the same amount of IR, the ambient amount radiated from the room or walls or outdoors. When a warm body like a human or animal passes by, it first intercepts one-half of the PIR sensor, which causes a positive differential change between the two halves. When the warm body leaves the sensing area, the reverse happens, whereby the sensor generates a negative differential change. These change pulses are what is detected.
PIR Motion sensors (Passive Infrared or Pyroelectric) from Panasonic for optimal usability and reliability
Panasonic develops and produces PIR Motion sensors, which combine easy integration, high reliability, and environment-friendly materials. The Panasonic PIR Motion sensors abbreviated as PaPIRs, has three series of products, including
- EKMB（WL） with low current consumption
- EKMC（VZ） for general use
- AMN（NaPiOn), is the traditional type. Various lenses, digital and analog types are available:
by TME
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