Lens arrangement for intrusion detection device
Number of patents in Portfolio can not be more than 2000
United States of America Patent
Stats
-
May 10, 1994
Grant Date -
N/A
app pub date -
Mar 11, 1992
filing date -
Mar 11, 1992
priority date (Note) -
Expired
status (Latency Note)
Importance
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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Cited Art Landscape
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