Smoke sensing apparatus of the light scattering type

Details Smoke sensing apparatus of the light scattering type Smoke sensing apparatus of the light scattering type

1985-02-05

1987-03-10

Westin, Edward P.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

340630, G08B 1710

Patent

active

046492828

ABSTRACT:
In a smoke sensing apparatus, a light receiving circuit including a light receiving element senses light emitted from a light emitting circuit including a light emitting element and scattered by smoke, and a voltage holding circuit converts the output signal of the light receiving circuit into a d.c. voltage and holds the d.c. voltage. A mean value circuit averages the voltage signal from the voltage holding circuit, and a switching circuit acts to bring the output of the mean value circuit to a level close to that of the output of the voltage holding circuit. A comparison circuit compares the output of the means value circuit with the output of the voltage holding circuit thereby generating a control signal.

REFERENCES:
patent: 3917956 (1975-11-01), Malinowski
patent: 4297688 (1981-10-01), Kakigi
patent: 4308531 (1981-02-01), Yamamoto
patent: 4528555 (1985-07-01), Yasukawa

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