Optical smoke detector

Details Optical smoke detector Optical smoke detector

G - Physics

08

B

340/140.1

G08B 17/10 (2006.01) G01N 21/53 (2006.01) G08B 17/107 (2006.01)

Patent

CA 1109541

ABSTRACT An optical smoke detector having a smoke sensing chamber comprising a point source of light mounted on the middle of a photodetector, the source of light transmitting in a forward direction and away from the photodetector and further having the point source of light located at the cen- ter of curvature of a spherical reflector. During normal standby periods when there are no smoke particles in the chamber to scatter the light, the light is transmitted to the spherical reflector and reflected back to the source without falling on the photodetector. In the presence of smoke the light is scattered and falls on the photodetector to indicate the presence of the smoke.

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