INFRARED ACTIVE SYSTEM FOR MONITORING EXTENDED SECURITY BOUNDARIES Russian patent published in 2020 - IPC G08B13/18 G08B25/00 

FIELD: alarm system.

SUBSTANCE: invention relates to the field of alarm signaling and is intended for detection of an intruder penetrating through the detection zone of the extended protection boundary and caused actuation of the alarm means on fact of interruption of beams of multibeam infrared (IR) barrier during crossing by intruder of this protection boundary. Result is achieved by an infrared active system for monitoring extended guard boundaries, each receiver of each tower of which is configured to selectively amplify signals at pulse modulation frequency Fm and comprises series-connected preamplifier, band-pass filter and adjustable amplifier, wherein input of pre-amplifier is input of receiver, and the output of the adjustable amplifier is the output of the receiver, the processor of the electronic unit of each tower is made with additional capabilities of providing intrapulse modulation in the sequences of the probing pulses No. TMR (transmitter) with a frequency Fm, as well as transmission of alarm signals from the corresponding section to the central security station by means of the interface unit and the communication interface line.

EFFECT: technical result consists in improvement of noise immunity of system to illumination from sources of constant radiation.

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