Optical smoke detector

Details Optical smoke detector Optical smoke detector

1979-06-04

1980-09-09

Corbin, John K.

Optics: measuring and testing

By particle light scattering

With photocell detection

250574, 340630, 350296, G01N 2101

Patent

active

042214858

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 center 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.

REFERENCES:
patent: 3226703 (1965-12-01), Finkle
patent: 4072421 (1978-02-01), Coyne et al.

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