Optical arrangement for a passive infrared motion detector
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United States of America Patent
Stats
-
Jun 2, 1981
Grant Date -
N/A
app pub date -
Apr 7, 1980
filing date -
Apr 25, 1979
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
An optical arrangement for use with an infrared detector characterized by a concave mirror surrounding the infrared detector, a body having a plane reflecting surface extending perpendicular to the axis of the detector, which surface faces the detector and the conical concave mirror, and having a conical reflecting surface extending from the plane surface, and at least one planar directional mirror pivotably mounted for reflecting infrared radiation at the conical reflecting surface. The arrangement can be used to monitor a space and if used with a second arrangement, whose directional mirrors are arranged to provide new sensing curtains adjacent the curtains of the first detector, the arrangement can determine the direction of movement of the object passing through the space.
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