The Incredible Growth of INFRARED SENSOR Industry

The Incredible Growth of INFRARED SENSOR Industry

A passive infrared sensor (PIR sensor) is an electronic sensor that measures infrared light (IR) emitted by objects in its field of view. They are most commonly used in PIR based motion detectors. PIR sensors are commonly used in security alarms and automatic lighting applications. PIR sensors detect general movements, but do not provide any information about who or what has moved. For this purpose, an imaging IR sensor is required.

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Some of the key players of Infrared Sensor Industry:

Hamamatsu Photonics, Excelitas Technologies, Murata Manufacturing, Raytheon, InfraTec, Teledyne, Honeywell, Texas Instruments, Nippon Avionics, FLIR Systems

PIR sensors are commonly referred to simply as "PIR" or sometimes "PID" for "passive infrared detector". The term passive refers to the fact that PIR devices do not emit energy for detection purposes. They completely capture infrared radiation (radiant heat) emitted or reflected by objects. All objects with a temperature above absolute zero emit thermal energy in the form of electromagnetic radiation. Normally, this radiation is invisible to the human eye, as it emits at infrared wavelengths. However, it can be detected by electronic devices designed for such a purpose.

A PIR sensor can detect changes in the amount of infrared radiation incident on it, which varies depending on the temperature and the surface properties of the objects in front of the sensor. When an object like a person passes in front of a background like a wall, the temperature at that point in the sensor's field of view rises from room temperature to body temperature and then back again. The sensor converts the resulting change in the incident infrared radiation into a change in the output voltage, and this triggers the detection. Objects with similar temperature but different surface properties can also have a different infrared emission pattern, and therefore moving these objects with respect to the background can also trigger the detector.

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