Smoke detection apparatus

G - Physics – 08 – B

Patent

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340/140.1

G08B 17/10 (2006.01) G08B 17/107 (2006.01) G08B 29/18 (2006.01)

Patent

CA 1252172

- 1A - 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 ampli- fied signal from said output stage the gain being adjusted to compensate for temperature dependence of the photocell signal.

460903

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