Dual channel pyroelectric intrusion detector
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United States of America Patent
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-
Sep 30, 1986
Grant Date -
N/A
app pub date -
May 21, 1984
filing date -
May 21, 1984
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
An intrusion detection system includes a plurality of infrared radiation sensitive elements, each of which comprises first and second spaced electrodes between which polarized pyroelectric material is positioned, each element being operative to produce a voltage proportional to the rate of change of infrared radiation incident thereon. The elements are closely spaced to one another and cover substantially all of at least one surface of the pyroelectric material. Multiple fields of view of areas under surveillance are fully covered (with negligibly small gaps). Alternate sensor elements are connected to a first amplifier channel and the other sensor elements are connected to a second amplifier channel. Coincidence means produces an alarm output in response to concurrent intruder signal generation by both of the amplifier channels.
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