FIELD: physics, signalling.
SUBSTANCE: invention relates to fire alarms. The device has series connected main radiation receiver and a main amplifier, as well as a signal processing unit. The device also has series-connected additional near-infrared radiation receiver, a low frequency amplifier, an amplitude detector, a regulating element, first, second and third resistors. The first leads of the resistors are connected to the inverting input of the main amplifier, the second lead of the second resistor is connected to the output of the main amplifier, the second lead of the first resistor is directly connected to the common bus and the second lead of the third resistor is connected through the output of the regulating element the control input of which is connected to the output of the amplitude detector.
EFFECT: invention speeds up operation and resistance to false triggering under effect of background radiation.
1 dwg
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