Optical smoke detector

Details Optical smoke detector Optical smoke detector

1993-09-14

1995-09-19

Hofsass, Jeffery A.

Communications: electrical

Condition responsive indicating system

Specific condition

340628, 250573, 250574, 356338, 356342, 356347, G08B 1700

Patent

active

054519314

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).

REFERENCES:
patent: 4175865 (1979-11-01), Horvath et al.
patent: 4230950 (1980-10-01), Forss et al.
patent: 4242673 (1980-12-01), Cooper
patent: 4397557 (1983-08-01), Herwig et al.
patent: 4857895 (1989-08-01), Kaprelian
patent: 4936666 (1990-06-01), Futhey
patent: 4966446 (1990-10-01), Huang et al.
patent: 5130531 (1992-07-01), Ito et al.

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