Active IR intrusion detector
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United States of America Patent
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-
Oct 7, 1997
Grant Date -
N/A
app pub date -
Jan 30, 1996
filing date -
May 30, 1994
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
The infrared detector contains an emitter (4), a receiver (5) and an analysis circuit (2') for obtaining a working signal (Un). The analysis circuit (2') contains a controller (29) for outputting a compensating signal (Ik) superimposed over the incoming signal (Ie), which on the one hand receives the working signal (Un) and on the other hand is connected to the output of the receiver (5). The compensating signal (Ik) is selected so that the working signal (Un) is corrected to the value zero so that the maximum sensitivity is retained at all times.
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