Optical smoke detector

Details Optical smoke detector Optical smoke detector

1978-10-06

1980-06-03

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

356338, G01N 2126

Patent

active

042063663

ABSTRACT:
An optical smoke detector including a plurality of walls extending from a dark chamber in which an optical smoke sensor is located. The walls form passages in the detector which extend from smoke entrances on the outer perimeter to smoke ports that feed into the dark chamber. In construction, the smoke entrances extend substantially continuously around the perimeter of the smoke detector to allow the free entry of smoke into the dark chamber. Each wall is arranged to overlap the next so as to obstruct the direct rays of light from entering the dark chamber and a screen is disposed around the perimeter of the detector to prevent the entrance of insects into the dark chamber.

REFERENCES:
patent: 3460124 (1969-08-01), Smith et al.
patent: 3916209 (1975-10-01), Steele et al.
patent: 4124298 (1978-11-01), Steele

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