Simplified intruder detector
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United States of America Patent
Stats
-
Aug 28, 1984
Issued Date -
N/A
app pub date -
Mar 25, 1981
filing date -
Sep 10, 1979
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A Simplified Intruder Detector is disclosed that incorporates a compact, unique optical system and detector array, including pyroelectric elements mounted in an adjacent, facing relationship. This causes radiation passing through one element to immediately pass through the adjacent element, thereby ensuring that white light, to which the detector elements are not particularly responsive, will generate substantially the same electrical signal in both elements. The electrical system preferably includes a unique power test feature to regularly insure that the system is adequately powered, but only after an intruder has been detected, thereby avoiding nonresponse to an intruder as well as false alarms.
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