Smoke detector

Details Smoke detector Smoke detector

G - Physics

08

B

340/140.1

G08B 17/10 (2006.01) G08B 17/103 (2006.01) H03G 3/20 (2006.01)

Patent

CA 1137589

5374/70/ MD.md -20-79 SMOKE DETECTOR Abstract of the Disclosure An improved smoke detector having a faster response time, greater immunity to ambient energy, and lower maintenance is disclosed. The smoke detector uses modulation techniques to differentiate within a smoke detection chamber between am- bient energy and energy from a transmitting source. A delayed automatic gain control is provided to reduce the effects of slow change of parameters in the detector itself and to provide greater discrimination between smoke which should cause an alarm and smoke resulting from, for example, tobacco. The disclosed improved smoke detector further provides for increased signal-to-noise ratios thus providing for more accurate and precise measurements.

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