Photoelectric smoke sensing and alarming device

Details Photoelectric smoke sensing and alarming device Photoelectric smoke sensing and alarming device

1980-01-02

1981-10-27

Caldwell,, Sr.,

Communications: electrical

Condition responsive indicating system

Specific condition

250574, G08B 1710

Patent

active

042976880

ABSTRACT:
A photoelectric smoke sensing and alarming device capable of discriminating the smoke generated by a fire from other smokes such as cigarette smoke. The device has a chamber into which the smoke is introduced. The chamber accommodates a light-emitting element adapted to emit a light beam in the form of pulses and a light-receiving element sensitive to the scattering of light due to the presence of the smoke in the chamber. The output from the light-receiving element is delivered to an amplifier which in turn delivers an output to a gate circuit having a level comparator adapted to compare the level of the output from the amplifier with a reference sensing level. Means are provided for actuating an alarming circuit only when more than two successive pulses of level exceeding the reference sensing level are generated.

REFERENCES:
patent: 3917956 (1975-11-01), Malinowski
patent: 3946241 (1976-03-01), Malinowski
patent: 4075499 (1978-02-01), Malinowski

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