Optical smoke detector

Details Optical smoke detector Optical smoke detector

1978-07-31

1981-03-24

Caldwell, Sr., John W.

Communications: electrical

Condition responsive indicating system

Specific condition

250574, G08B 1710

Patent

active

042583608

ABSTRACT:
An optical smoke detector which includes a light source and light sensing element so arranged that the quantity of light detected by the element will be determined by the presence of smoke in the detector, a power source for periodically supplying sets of actuating pulses to the light source, apparatus connected with the light sensing element for detecting light pulses which are synchronized with the actuating pulses and producing an alarm when pulses of a predetermined magnitude are detected.

REFERENCES:
patent: 2877453 (1959-03-01), Mendenhall, Jr.
patent: 3316410 (1967-04-01), Meili et al.
patent: 3543260 (1970-11-01), Engh
patent: 3946241 (1976-03-01), Malinowski

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