Light decrease type smoke sensor

Details Light decrease type smoke sensor Light decrease type smoke sensor

1978-05-19

1980-05-13

Caldwell, Sr., John W.

Communications: electrical

Condition responsive indicating system

Specific condition

250573, G08B 1710

Patent

active

042031001

ABSTRACT:
A smoke detector includes a light-emitting circuit, a light-receiving circuit, a smoke detecting space between the light-emitting and receiving circuits, and an amplifier circuit connected to the light-receiving circuit amplifying the output of the light-receiving circuit at an output terminal. An output comparison circuit is provided having an input terminal connected to the output terminal of the amplifier circuit and a voltage memory circuit is connected to another input terminal of the output comparison circuit. A detector circuit has one input terminal connected to the memory circuit and another input terminal connected to the output terminal of the comparison circuit, and a fire alarm circuit is connected to the detector circuit for operating an alarm when smoke from a fire fills such space between the light-emitting and receiving circuits, whereby contamination due to time and environmental factors has a minimal adverse effect on the detection of smoke in such space.

REFERENCES:
patent: 3846772 (1974-11-01), Peberdy
patent: 3919702 (1975-11-01), Hayes et al.
patent: 4011458 (1977-03-01), Malinowski

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