Communications: electrical – Condition responsive indicating system – Specific condition
Patent
1979-09-10
1982-12-14
Caldwell, Sr., John W.
Communications: electrical
Condition responsive indicating system
Specific condition
250340, 250353, 340555, 340565, G08B 1318
Patent
active
043640303
ABSTRACT:
The improved intruder detection system of the present invention, because of its sensor, optical, and electronic systems, is uniquely capable of responding only to radiation from an intruder to signal an alarm. To achieve this, the sensor and optical systems are designed and cooperate to optically reject and balance-out extraneous, nonintruder-related radiation. In addition, the electronic system detects and rejects nonintruder-related inputs by recognizing certain uniquely intruder-related characteristics of the sensor signals, and to only signal an alarm in response to inputs evidencing such characteristics. Preferably the system is designed to reliably sense the presence of an intruder in multiple zones, to be economical to manufacture, easy to install, to be battery-powered and of a long life.
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Caldwell Sr. John W.
Nowicki Joseph E.
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