Infrared radiation is called "active infrared intrusion detector", which structure includes transmitter, receiver, beam intensity LEDs, optical lenses and so on. The detection principle is the use of LED infrared light emitting diode transmitted by infrared, optical mirror focusing the light to a great distance, is accepted by the light. When the infrared beam is shut off, it will sound the alarm. Infra-red is not visible and can spread, cast out, in the home path phase will form a cone beam, as the distance increases, the ideal strength and transmission distance is an inverse square attenuation.
Infrared on shot used infrared band of shot beam, people Visual not visible, has hidden of Defense way: makes invasion who in unknowingly in the touch police, also used blocking all infrared pulse coding shot beam for alarm triggered conditions, dang insects, and leaves or small animal, through infrared defense shot beam network Shi, due to cannot completely cover broken all infrared pulse coding shot beam so not produced errors alarm. When the infrared receiver power or signal when the line was cut, alarm wireless alarm signal output circuit will automatically output signal.
Infrared radiation intrusion detectors active IR transmitter and active infrared receiver, when the infrared beam between the transmitter and receiver are completely block or by a given block device that can generate alarms when the percentage, called active infrared intrusion detector.
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