Photoelectric instrument for observing a viewing corrider of interest
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United States of America Patent
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Feb 5, 1985
Issued Date -
N/A
app pub date -
May 3, 1982
filing date -
May 3, 1982
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A photoelectric instrument detects dissimilar variations in a viewing corridor and provides an alarm signal responsive to such changes. A lens, such as a camera lens, is mounted on a case and separate photoelectric sensors are adjustably positioned in the focal plane of the lens within the case. The photoelectric sensors are moved relative to each other to define a viewing corridor of interest. The photoelectric sensors are coupled to a differential amplification network and the inputs to the amplification network are adjusted to produce a reference signal. Deviations of the differential amplification network output from the reference signal indicate an intrusion or non-uniform alteration of the field of view, which results in an alarm signal.
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