Smoke detecting apparatus

Details Smoke detecting apparatus Smoke detecting apparatus

1984-08-13

1987-05-12

Westin, Edward P.

Radiant energy

Photocells; circuits and apparatus

Photocell controlled circuit

250214AG, 250574, 307310, 307311, 328 2, 328 3, H01J 4014, G01N 2153

Patent

active

046653112

ABSTRACT:
A light sensing apparatus comprising a solid-state photocell responsive to low levels of light connected to an impedance matching buffer stage, a gain controlled amplifier stage and an output amplifier stage; a gain control network controlled by a temperature sensor for receiving an amplified signal from said output stage, the gain being adjustable to compensate for temperature dependance of the photocell signal.

REFERENCES:
patent: 3480781 (1969-11-01), Mandalakas
patent: 3588535 (1971-06-01), Hellstrom
patent: 4096382 (1978-06-01), Numata et al.
patent: 4438348 (1984-03-01), Casper et al.

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