Electronic smoke detector

Details Electronic smoke detector Electronic smoke detector

G - Physics

08

B

340/140.1

G08B 17/10 (2006.01) G08B 17/103 (2006.01) G08B 17/107 (2006.01)

Patent

CA 1292533

ABSTRACT OF THE DISCLOSURE In a combined obscuration and scattered-light smoke detector, light from a light source in a smoke chamber is reflected from an image-forming optical component onto a first light sensor which senses a reduced electrical signal in the presence of smoke while a second sensor, viewing light from the light source at an angle, senses an increased electrical signal in the presence of smoke. The output of each receptor is subjected to a band pass filter, an amplifier and a comparator; the resultant signals insure early and reliable activation of an alarm when even a low level of smoke is present in the smoke detector. A second light source having a wavelength different from that of the first light source produces, in the obscuration mode, added sensitivity to smoke.

574418

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