Infrared intruder detection system
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United States of America Patent
Stats
-
Nov 3, 1987
Grant Date -
N/A
app pub date -
Apr 8, 1986
filing date -
Apr 15, 1985
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
An infrared intruder detection system has two separate channels A and B. Each channel has its own pyroelectric detector device and threshold level comparator. The comparator is responsive to dual polarity pyroelectric voltage outputs produced by the associated detector device as a result of an intruder-related infrared image moving thereacross. A logic circuit analyzes the comparator outputs and responds to the identification of particular intruder-indicative sequences of comparator outputs in both channels to generate an alarm and/or switching output. The logic circuit may also identify shock-induced comparator outputs. The system offers a high intruder detection capability with immunity from false triggering.
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