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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.
Infrared homing is a passive weapon guidance system which uses the infrared (IR) light emission from a target to track and follow it seamlessly. [1] Missiles which use infrared seeking are often referred to as "heat-seekers" since infrared is radiated strongly by hot bodies.
An IRST sensor on a Sukhoi Su-35. An Infrared Search and Track (IRST) system (sometimes known as infrared sighting and tracking) is a method for detecting and tracking objects which give off infrared radiation, such as the infrared signatures of jet aircraft and helicopters.
A passive infrared detector mounted on circuit board (right), along with photoresistive detector for visible light (left). This is the type most commonly encountered in household motion sensing devices and is designed to turn on a light only when motion is detected and when the surrounding environment is sufficiently dark.
The Army's AN/GSQ-187 Improved Remote Battlefield Sensor System (I-REMBASS) contains a Passive Infrared Sensor, DT-565/GSQ, which "detects tracked or wheeled vehicles and personnel. It also provides information on which to base a count of objects passing through its detection zone and reports their direction of travel relative to its location.
The EuroFirst Passive Infrared Airborne Track Equipment (PIRATE) is the forward looking infrared (FLIR)/infra-red search and track (IRST) for the Eurofighter Typhoon. [1] It is produced by the EuroFIRST consortium consisting of Leonardo S.p.A. of Italy (lead contractor and design and technical authority), Thales Land & Joint Systems of the UK, and Tecnobit of Spain.
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