FIELD: security systems.
SUBSTANCE: invention relates to the field of security alarm system of the detection zone of the protection boundary created by a passive infrared device during the crossing of the guard by this violator. Device consists of an optical system that forms three sectors of the detection zone, displaced in space relative to each other, and an electronic unit for generating an alarm signal and boundary signals. Electronic unit comprises a first central, as well as a second and third lateral infrared sensors, a first, second and third signal processing channels, and a processor. Each signal processing channel contains a bandpass filter, an amplifier and a comparator.
EFFECT: possibility of the device forming an additional boundary signal exceeding the range of the device with the provision of increasing the functional reliability of the alarm.
6 cl, 2 dwg
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