SMOKE RECORDING GEAR Russian patent published in 2004 - IPC

FIELD: fire alarms, facilities recording smoke while detecting ignition at earliest stages of fire in closed rooms. SUBSTANCE: smoke recording gear has clock generator, radiator coupled through optical camera with light-absorbing walls to photodetector, reset circuit, comparison and storing circuit, former of signal of recorded smoke. Salient feature of gear lies in that it additionally incorporates circuit of synchronous detection and comparison and storing circuit comes in the form of first and second binary counters. V input and R input of first binary counter of comparison and storing circuit are connected to corresponding outputs of clock generator, output of above-mentioned first binary counter is connected in parallel with input of radiator, V input of second binary counter of comparison and storing circuit and first input of synchronous detection circuit which second and third inputs are coupled correspondingly to outputs of photodetector and reset circuit and which second output is connected to R input of second binary counter of comparison and storing circuit. Output of second binary counter of comparison and storing circuit is coupled to C inputs of both binary counters and to input of former of signal of recorded smoke. Synchronous detection circuit has two logic NAND gates, diode, RC circuit. Inputs of first logic NAND gate are coupled to output of photodetector and its output is connected through diode to RC circuit which is coupled to input of second logic NAND gate and through capacitor to output of first binary counter of comparison and storing circuit. Another input of second logic NAND gate is coupled to output of reset circuit and its output is connected to R input of second binary counter of comparison and storing circuit. EFFECT: increased accuracy of gear thanks to elimination of pulse noises while information signal is formed. 1 cl, 2 dwg _