Radiant energy – Invisible radiant energy responsive electric signalling – Infrared responsive
Patent
1992-03-11
1994-05-10
Fields, Carolyn E.
Radiant energy
Invisible radiant energy responsive electric signalling
Infrared responsive
250342, 359742, G08B 1318
Patent
active
053110242
ABSTRACT:
Fresnel lens elements in a lens grouping and mounted in a fixed relationship to a detector, to define a 360.degree. field of view for use in a sensor for passive detection of infrared radiation. Lens elements of the lens grouping can be selected by masking other lens elements, to leave a lens array defining a particular pattern of detection for a desired application. By masking certain of the lenses of the lens grouping, wide angle three-dimensional or fan-like planar curtain patterns of detection are obtained for use of the sensor in either a wall-mounted or ceiling-mounted installation, and vertical curtains of coverage can be obtained using ceiling-mounted installation. Lens elements of different sizes and focal lengths are arranged to gather ample radiation for detection of distant intruders in certain directions.
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patent: 5017783 (1991-05-01), Mousavi
patent: 5026990 (1991-06-01), Marman et al.
COIL ceiling lens sales literature (1 page) of Combined Optical Industries Ltd. Netherlands undated.
Abel William E.
Marman Douglas H.
Fields Carolyn E.
Sentrol, Inc.
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