SMOKE DETECTOR Russian patent published in 2001 - IPC

FIELD: automatic fire alarm, in particular, smoke detectors. SUBSTANCE: detector preserves the positive qualities of smoke detectors operating both on the principle of detection of scattered radiation and on the principle of monitoring of transmitted light. The detector has a pulse generator with antiphase outputs connected to the radiation sources of two optopairs, the outputs of the photodetectors of the optopairs are connected to the inputs of the measuring transducer representing an arithmetic unit, its third input is connected to the output of the pulse switch, and the output of the arithmetic unit is connected to the output stage. EFFECT: minimized influence of variation of the radiation intensity of the sources and sensitivity of the photodetectors on detector operation. 2 dwg