Photoelectric smoke detector

Details Photoelectric smoke detector Photoelectric smoke detector

1985-08-23

1988-06-28

Westin, Edward P.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

340630, 356339, 356338, G08B 1710

Patent

active

047541504

ABSTRACT:
A photoelectric smoke detector is equipped with a light emitter for radiating light into a measuring space. A light receiver detects scattered light caused by the presence of smoke in the measuring space. The measuring chamber is constructed as a light trap such that the light beam radiated by the light emitter is multiply reflected and cannot reach the light receiving element of the light receiver.

REFERENCES:
patent: Re32105 (1986-04-01), Enemark
patent: 3431423 (1969-03-01), Keller
patent: 3708675 (1973-01-01), Tashiro et al.
patent: 4216377 (1980-08-01), Hasegawa et al.
patent: 4469953 (1984-09-01), Fujisawa et al.
patent: 4596465 (1986-06-01), Nagashima
Patent Abstracts of Japan, vol. 6, No. 112, Jun. 23, 1982.

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