Optical smoke detector inlet screen

Details Optical smoke detector inlet screen Optical smoke detector inlet screen

1977-03-14

1978-11-07

McGraw, Vincent P.

Optics: measuring and testing

By particle light scattering

With photocell detection

250574, 340630, 356439, G01N 2100, G01B 1710, G01N 2126

Patent

active

041242980

ABSTRACT:
An optical smoke detector has a housing which forms a dark chamber into which light is directed on a path viewed by a photocell. Light scattered from the path by smoke causes the cell to trigger an alarm. The housing includes an interior wall around the dark chamber and an exterior wall exposed to ambient light. A wire mesh extending between offset ports in the exterior and interior walls screens insects from the chamber and obstructs light from passing directly to the interior part.

REFERENCES:
patent: 3863076 (1975-01-01), Steele et al.
patent: 3968379 (1976-07-01), Crane

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