Optical smoke detector circuit

Details Optical smoke detector circuit Optical smoke detector circuit

1979-03-01

1980-09-30

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

250214AG, H01J 4014

Patent

active

042257913

ABSTRACT:
An improved circuit for an optical smoke detector utilizing an active band pass filter which has a bias feedback to the phototransistor detecting element to bias the phototransistor to a static conductivity state of high gain or high sensitivity without regard to whether the phototransistor is in a high ambient light level or a low (dark) ambient light level.

REFERENCES:
patent: 3185975 (1965-05-01), Kompelian
patent: 3940753 (1976-02-01), Muller
patent: 4063227 (1977-12-01), Peterson

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