Method for operating an optical smoke detector and optical smoke

Details Method for operating an optical smoke detector and optical smoke Method for operating an optical smoke detector and optical smoke

1989-09-06

1991-04-16

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

356439, 340630, G01N 1506

Patent

active

050085590

ABSTRACT:
A method for operating an optical smoke detector, wherein for smoke detecting purposes at least one light sensitive receiver within a detection chamber measures the useful scattered radiation which emanates from a volume unit within said chamber which is located in the intersecting area of the collimated field of view of said receiver and of the collimated beam of a light source within said chamber, said receiver sensing the scattered radiation caused by a contamination of said chamber or a second light sensitive receiver detecting the radiation reflected from a surface unit of said chamber, respectively, whereby measuring the reflexion radiation emanating from an illuminated surface unit within said chamber.

REFERENCES:
patent: 4166960 (1979-09-01), Meili
patent: 4242673 (1980-12-01), Cooper
patent: 4647785 (1987-03-01), Morita
patent: 4857895 (1989-08-01), Kaprelian

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