Optical smoke detector operating in accordance with the extinction principle and method for compensating its temperature drift
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United States of America Patent
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Sep 24, 2002
Grant Date -
N/A
app pub date -
Sep 14, 1999
filing date -
Sep 14, 1998
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A detector device for detecting the presence of airborne particles such as smoke includes a light source, an optical bridge, a measurement path, a reference path, a measurement receiver and a reference receiver. The optical bridge, in addition to the light source and the measurement and reference receivers, are the only optical elements of the detector device. The optical bridge includes two circular apertures arranged downstream of the light source along the radiation path. The light source is arranged in a chamber having an air reservoir, whose surface area is substantially greater than that of the light source. A temperature drift curve is determined by heating the light source and storing the detector signal at different temperatures.
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