Optical smoke detector
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United States of America Patent
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-
Sep 19, 1995
Grant Date -
N/A
app pub date -
Sep 14, 1993
filing date -
Sep 14, 1992
priority date (Note) -
Expired
status (Latency Note)
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Abstract
Optical smoke detectors such as extinction smoke detectors and scattered-light smoke detectors include a radiation source, a radiation detector or receiver, and a measurement volume which is in communication with ambient atmosphere and which is traversed by a light path from the radiation source to the radiation receiver. For compactness and simplicity, such an optical smoke detector is provided with a planar-optical element in the optical path. Suitable as planar-optical elements are diffractive elements, e.g., holographic-optical elements (HOE), and micro-Fresnel elements (MFE), e.g., micro-Fresnel reflectors (MFR).
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