Method for determining the rate of rotation

Optics: measuring and testing – For optical fiber or waveguide inspection

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G01N 2100

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active

059952113

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.

REFERENCES:
patent: 4440498 (1984-04-01), Sheem
patent: 5430544 (1995-07-01), Poisel et al.
patent: 5767509 (1998-06-01), Cordova et al.

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