IR intrusion detector using scattering to prevent false alarms
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United States of America Patent
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Jun 13, 1995
Grant Date -
N/A
app pub date -
Mar 23, 1994
filing date -
Mar 26, 1993
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
An infrared intrusion detector uses infrared-sensitive sensors with pyroelectric sensor elements for detecting infrared radiation from a spatial region to be monitored. Infrared radiation passes through an entrance window and reaches the sensor elements via focusing mirrors. Extraneous radiation, outside the useful radiation band, is eliminated by filtering at the entrance window and by an optical transmission filter, and by scattering at suitable rough surfaces of the focusing mirrors. As a result, the infrared intrusion detector is less sensitive to extraneous radiation and less likely to produce false alarms.
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