Passive infrared detector
Number of patents in Portfolio can not be more than 2000
United States of America Patent
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-
Jul 17, 2001
Grant Date -
N/A
app pub date -
Oct 13, 2000
filing date -
Oct 14, 1999
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
The infrared detector contains an entrance window for infrared radiation, an infrared sensor with an evaluation circuit and an anti-masking device having an optical transmitter and an optical receiver for detecting phenomena or optical changes immediately in front of the detector and/or changes in the optical properties of the entrance window. The signals of the anti-masking device are evaluated in two channels, wherein one channel responds to temporally limited phenomena or changes and the other channel responds to temporally stable phenomena or changes. A combined evaluation of the signals in the two channels takes place. In the combined evaluation, the channel processing the signals of the infrared sensor is preferably also included. As a result, the infrared detector acquires an increased immunity to false alarms and a higher sensitivity.
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