Passive infrared detector
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United States of America Patent
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-
Mar 23, 1982
Grant Date -
N/A
app pub date -
Nov 1, 1979
filing date -
Nov 1, 1979
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A passive infrared intrusion detection system is provided in which one or more Fresnel lenses are employed to focus received infrared energy onto a detector element which provides an electrical output signal indicative of the level of received radiation. The Fresnel lens is preferably formed of a plastic material which is translucent to visible light such that visible light is not focussed onto the detecting element while infrared radiation is.
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