Communications: electrical – Condition responsive indicating system – Specific condition
Patent
1981-03-25
1984-08-28
Swann, III, Glen R.
Communications: electrical
Condition responsive indicating system
Specific condition
250340, 250353, 340527, 340636, G08B 1318
Patent
active
044686579
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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