Infrared intrusion detector with pyroelectric sensor and charge amplifier
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United States of America Patent
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Nov 29, 1983
Grant Date -
N/A
app pub date -
Sep 18, 1981
filing date -
Oct 6, 1980
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
An infrared intrusion detector, utilizing as a sensor element a pyroelectric detector element, accomplishes evaluation of the output signal of the detector element with a charge amplifier, for instance by means of a capacitive feedback coupled operational amplifier, the output signal of which is reset at certain time intervals. The evaluation circuit operates independently of the detector capacitance and therefore enables optimum utilization of the pyroelectrical properties. By virtue of the short-circuit operation and the low ohmic properties of the circuit there is obtained a particularly good non-sensitivity against external disturbances and low noise and increased sensitivity.
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