Heterodyne laser detection
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United States of America Patent
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-
Feb 2, 1988
Grant Date -
N/A
app pub date -
May 10, 1985
filing date -
May 10, 1985
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A heterodyne laser detection system includes a local oscillator laser, an infrared light detector positioned to receive light transmitted through a receiving window and also from the local oscillator laser and to generate heterodyne signals in response thereto. An oscillator controller repeatedly sweeps the frequency of the local oscillator laser to ensure that the laser signal being sought generates heterodyne signals within the limited passband of an intermediate frequency amplifier. Upon detecting heterodyne signals amplified by the intermediate frequency amplifier above a defined threshold, the oscillator control switches to control the local oscillator laser to track the detected laser signal such that the heterodyne signals remain within the passband of the intermediate frequency amplifier.
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