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Gated phase-modulation approach to fiber-optic gyroscope with linearized scale factor.

B Y Kim, H J Shaw

|September 2, 2009

Summary

This study introduces a phase-modulation technique for closed-loop fiber-optic gyroscopes, enhancing scale factor linearity. The method shows promise for improved performance in fiber optic sensing applications.

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Area of Science:

Optics and Photonics
Sensor Technology
Instrumentation

Background:

Fiber-optic gyroscopes (FOGs) are crucial for inertial navigation.
Traditional FOGs often face challenges with scale factor linearity and wavelength dependence.
Closed-loop operation is desirable for enhanced FOG performance.

Purpose of the Study:

To present a novel phase-modulation approach for closed-loop fiber-optic gyroscopes.
To demonstrate the capability of this approach to provide a linearized scale factor.
To theoretically investigate the suppression of source-wavelength dependence.

Main Methods:

Implementation of a phase-modulation technique within an all-fiber gyroscope configuration.
Manual closing of the feedback loop for experimental validation.
Theoretical analysis of the scale factor's dependence on source wavelength.

Main Results:

Preliminary experiments show good linearity in the scale factor.
The phase-modulation approach inherently suppresses source-wavelength dependence in theory.
The closed-loop system demonstrates improved scale factor stability.

Conclusions:

The phase-modulation approach offers a viable method for achieving a linearized scale factor in closed-loop fiber-optic gyroscopes.
This technique holds potential for reducing wavelength sensitivity, a common issue in FOGs.
Further research and automated feedback loop implementation are warranted to fully realize the benefits.