Passive infrared intrusion detection system
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United States of America Patent
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-
Sep 16, 1986
Grant Date -
N/A
app pub date -
Jun 6, 1984
filing date -
Jun 10, 1983
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A passive infrared intrusion detector has: a multi-faceted parabolic reflector for dividing a target controlled area into a plurality of optically divided detection zones, for collecting infrared rays emitted from an object within the controlled area; a passive infrared intrusion sensor combined with the reflector to detect the collected infrared rays; a first means for generating a pulse when an absolute value of an output of the passive intrusion sensor exceeds a reference value; and a second means for generating an alarm signal when predetermined pulses are received from the first means within a predetermined period. A pulse width discriminator is used to eliminate narrow noise pulses.
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