Method for determining the rate of rotation
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United States of America Patent
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Nov 30, 1999
Grant Date -
N/A
app pub date -
Feb 23, 1998
filing date -
Feb 21, 1997
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A method and apparatus for determining a rate of rotation uses a fiber-optic gyro which has a 3.times.3-coupler. A first channel of the coupler is optically connected on one side with a light source and on the other side with a first photo element; and the two other channels are optically connected on one side with a fiber coil and on the other side with a second and third photo element respectively. A depolarizer is arranged at least between the light source and the 3.times.3-coupler or at one end of the fiber coil; alternatively, the fiber coil has a polarization-maintaining fiber. An electronic signal processing system is used to determine a temperature-related value, independent of the rate of rotation, for damping of the fiber coil and of the 3.times.3-coupler, based on the signals of the three photo elements and from temperature-dependent coefficients determined by calibration. Then the rate of rotation is computed based on the signals of the three photo elements, the temperature-dependent coefficients and the computed, temperature-related value for the damping.
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