Passive infrared motion detector and method
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United States of America Patent
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Apr 10, 2001
Grant Date -
N/A
app pub date -
Nov 10, 1997
filing date -
Nov 10, 1997
priority date (Note) -
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Abstract
Zones of a passive infrared (PIR) motion detector lens are staggered at close range to provide for pet immunity. In a dual sensor, dual lens configuration, the sensor signal is acted on to generate an alarm only when the sensor signal is simultaneous, indicating that an infrared emitting object big enough to cross both staggered zones of a zone pair has been detected. To further enhance sensitivity and immunity to noise, two dual element PIR sensors are arranged in opposite polarity with their elements vertically parallel. The sensor output is simultaneous and of opposite polarity, and noise can be suppressed by blocking like-polarity signals.
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