Simplified intruder detector

Communications: electrical – Condition responsive indicating system – Specific condition

Patent

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Details

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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patent: 3631434 (1971-12-01), Schwartz
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patent: 3760399 (1973-09-01), Schwartz
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patent: 3839640 (1974-10-01), Rossin
patent: 3923382 (1975-12-01), Harding
patent: 3928849 (1975-12-01), Schwarz
patent: 3958118 (1976-05-01), Schwarz
patent: 4052716 (1977-10-01), Mortensen
patent: 4179691 (1979-12-01), Keller

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