Communications: electrical – Condition responsive indicating system – Specific condition
Patent
1990-04-20
1992-06-30
Wieder, Kenneth A.
Communications: electrical
Condition responsive indicating system
Specific condition
340556, 250342, 250349, G08B 1318
Patent
active
051267187
ABSTRACT:
An intrusion detection system includes an array of infrared radiation-sensitive elements, each element comprises first and second spaced electrodes between which pyroelectric material is positioned, and each element is operative to produce a voltage proportional to the rate of change of infrared radiation incident thereon. A pair of oppositely poled detector elements is connected to a first signal processing channel and a second pair of oppositely poled detector elements is connected to a second signal processing channel. The system also includes coincidence means such that an alarm output in response is produced in response to concurrent application of intruder signals of opposite polarity to the two signal processing channels.
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Pittway Corporation
Wieder Kenneth A.
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