Automatic gain control for interferometers and phase sensitive detectors
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United States of America Patent
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Dec 10, 1991
Grant Date -
N/A
app pub date -
Jun 18, 1990
filing date -
Jun 18, 1990
priority date (Note) -
Expired
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Abstract
An automatic gain control circuit for an interferometer or a phase sensitive detector reduces sensitivity to fluctuations in amplitude of input signals. A pair of currents from the phase sensitive detector that represents a detected phase difference are input to an automatic gain control ratio detector. The output of the automatic gain control ratio detector is a function of the ratio of the difference and sum of the phase sensitive detector currents that is substantially independent of intensity or amplitude fluctuations of the input signals.
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