Smoke detector

Details Smoke detector Smoke detector

G - Physics

08

B

340/140.1

G08B 17/10 (2006.01) G08B 17/107 (2006.01) G08B 29/04 (2006.01) G08B 29/24 (2006.01)

Patent

CA 1208334

INVENTORS: J?RG MUGGLI, HEINZ G?TTINGER and ZOLTAN HORVATH INVENTION: SMOKE DETECTOR ABSTRACT OF THE DISCLOSURE A smoke detector is disclosed having a radiation source operated in a pulsed mode. Externally of a direct radiation region of the radiation source there is arranged a radiation receiver which, in the presence of smoke or other particles emanating from a combustion process and located in the radiation region, is impinged by scattered radiation and delivers an output signal to an evaluation circuit. The evaluation circuit contains switching elements which, when the output signal or pulse exceeds a predetermined threshold value, delivers an alarm signal. Near to the radiation receiver there is arranged a reference cell in the direct radiation beam of the radiation source, this reference cell controlling the emission of radiation by the radiation source. Further, there are provided means which in the presence of a slow change of the received pulse adjusts the threshold value with a time-constant of more than one minute. Consequently, there is obtained an output signal of the radiation receiver which is dependent upon the smoke density and which is independent of the contamination or soiling of the smoke detector.

414877

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