Reply to "Motion detectors"

FlashOGR Forum Member

Every object or person with heat emits infrared radiation. Ever heard of FLIR? Forward Looking InfraRed? AKA thermal imaging? It works by detecting IR emitted from heat sources and displaying it on an convenient screen. Makes it real easy for our troops to spot enemy snipers at night. Passive InfraRed (PIR) is used for security system motion detectors. With PIR the IR sensor takes a "snapshot" of the all the detectable IR radiation within its view. When something moves into the sensor's view that changes the IR "picture," the alarms goes off. Then the sensor resets and takes a new picture.

2/2/129:43 PM

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