Fiber optic gyroscope modulation error reduction

Optics: measuring and testing – By dispersed light spectroscopy – Utilizing a spectrometer

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385 3, 359279, G01C 1972

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active

052892581

ABSTRACT:
An error control arrangement for an optical fiber rotation sensor having electromagnetic waves propagating in opposite directions passing through a bias optical phase modulator operated by a phase modulation generator both of which can contribute second harmonic distortion resulting in errors in the sensor output signal which are controlled. Control of the bias optical phase modulator contribution for a modulator having a piezoelectric body wrapped with an optical fiber portion is accomplished by mounting the body utilizing layers having nonlinear stiffness.

REFERENCES:
patent: 4637722 (1987-01-01), Kim
patent: 4796993 (1989-01-01), Sonobe et al.
"All-single-mode Fiber-optic Gyroscope," R. Bergh et al, Optics Letters, vol. 6(4), 1981, pp. 198-200.
"All-single-mode Fiber-optic Gyroscope with Long-term Stability," R. Bergh et al Optics Letters, vol. 6(10), 1981, pp. 502-505.
"Response of Fiber Gyros to Signals Introduced at the Second Harmonic of the Bias Modulation Frequency," B. Y. Kim et al, Single-Mode Optical Fibers, Proceedings of SPIE, vol. 425, 1983, pp. 86-89.
"An Overview of Fiber-Optic Gyroscopes," R. Bergh et al, Journal of Lightwave Technology, vol. LT-2(2), 1984, pp. 91-107.
"Impact of Modulation Induced Signal Instabilities on Fiber Gyro Performances," by E. Kiesel, Fiber Optic and Laser Sensor V, Proceedings of SPIE, vol. 838, 1987, 129-139.
"Drift Reduction in Optical Fiber Gyroscopes," S. L. A. Carrara, Doctoral Dissertation, Stanford University Department of Electrical Engineering, Nov. 1988, pp. 142-145.
"Drift Caused by Phase Modulator Non-Linearities in Fiber Gyroscopes," S. L. S. Carrara, SPIE vol. 1267, Fiber Optic Sensors IV (1990), pp. 187-191.

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