Suppressed transient uniform detection sensitivity pir detector
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United States of America Patent
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Oct 17, 1989
Grant Date -
N/A
app pub date -
Dec 30, 1987
filing date -
Dec 30, 1987
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A passive analog equalizer is connected to the output of an infrared detector to provide increasing pyroelectric detector sensitivity with increasing target frequency in order to provide a detection sensitivity which is substantially flat over the target velocity range of interest. An interruptable modulator is connected to the equalized pyroelectric detector signal to shift its frequency upwardly in order to provide negligible drift, fast recovery from transients, and the ability to quickly shut down the modulator when a transient occurs. A transient detector is operative in response to transients in the pyroelectric detector output signal to provide a window during which the modulator is interrupted in order to prevent transient induced false alarms.
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