Presence Detector (PIR)
A PIR detector located
strategically inside the protected area is an infrared „eye“ detecting any
movement over its area.
PIR denomination comes from Passive Infrared, known as thermal infrared as well.
is the natural radiation emitted by warm objects, i.e. the thermal
radiation produced by a fire. Common objects’ extremities with normal
temperatures and moving around us emit more passive infrared radiation
than the background they stand on. People, living creatures generally,
and hot engine cars emit more radiation that PIR detectors can detect
anytime (daytime and night time as well).
Passive infrared radiation does not have to be taken for the TV remote control infrared radiation. Passive infrared does not emit harmful radiation. All it does is „to see in the dark“.
people have heard of passive radiation used for movement detectors
commanding automatic light turning on or opening stores’ doors.
infrared radiation can also be used for various automatizations such as:
light/air conditioning turning on/off, door opening/closing, alarm
equipments, presence detection, etc.
Passive infrared radiation is detected by the pyroelectric sensor. This sensor detects temperature changes up to a degree thousandth produced by a person’s 10m movement.
According to the protected area features, pyroelectric sensored detectors can be provided with different type of lenses: volumetric, pets, curtain or corridor type.
Some detectors also use microwave detection according to radar principle. They are used in high false alarm producing risk areas.
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