Method for operating an optical smoke detector and optical smoke detector for the method
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United States of America Patent
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Apr 16, 1991
Grant Date -
N/A
app pub date -
Sep 6, 1989
filing date -
Sep 17, 1988
priority date (Note) -
Expired
status (Latency Note)
Importance
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.
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