Optical rate sensor having modulated clockwise and counterclockwise beams
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United States of America Patent
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Jul 22, 1997
Grant Date -
N/A
app pub date -
Oct 17, 1994
filing date -
Oct 16, 1993
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
In an open loop rate sensor clockwise (CW) and counterclockwise (CCW) beams from a common source 10 pass in opposite directions around a coil 20 of optical fiber and recombine on a detector 24. A phase modulator 22 applies a stepped phase modulation in which each step is of duration equal to the transit time of the coil 20 and in which alternate steps are zero. The intermediate steps increase linearly from zero to 2.pi.. Without modulation, the CW and CCW beams combine on the detector with a combined intensity which varies as a cosine of rate. The above modulation causes two points to either side of the cosine fringe to be sampled which move progressively farther as the amplitude of the stepped modulation increases. The sample data is processed to determine the rate applied to the rate sensor.
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