Smoke detector with a conical ring-shaped radiation region

Details Smoke detector with a conical ring-shaped radiation region Smoke detector with a conical ring-shaped radiation region

1977-03-14

1980-01-01

McGraw, Vincent P.

Optics: measuring and testing

By particle light scattering

With photocell detection

250574, 350189, 340630, G01N 2100

Patent

active

041814398

ABSTRACT:
An optical smoke detector comprising a radiation source which transmits radiation into a predetermined spatial region and a radiation receiver to which there is delivered the radiation which is scattered by particles located along the radiation path. The radiation source possesses a substantially conical ring-shaped radiation characteristic or pattern and the radiation receiver is arranged substantially at or along the cone axis.

REFERENCES:
patent: 2254961 (1941-09-01), Harris
patent: 3185975 (1965-05-01), Kompelien
patent: 3409885 (1968-11-01), Hall
patent: 3497303 (1970-02-01), Enemark et al.
patent: 3999855 (1976-12-01), Hirschfeld

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