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A Random-displacement Measurement by Combining a Magnetic Scale and Two Fiber Bragg Gratings

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All-single-mode fiber-optic gyroscope with long-term stability.

R A Bergh, H C Lefevre, H J Shaw

|August 28, 2009

Summary

A novel all-fiber gyroscope integrates all components onto a single optical fiber, minimizing reflections. This design achieves exceptional long-term stability, crucial for precise inertial navigation systems.

Area of Science:

Fiber optics
Inertial navigation systems
Optical sensing technologies

Background:

Traditional gyroscopes often suffer from localized reflection points, leading to instability.
Coherent scattering effects from light sources can degrade gyroscope performance.
Instabilities in fiber optic gyroscopes limit their precision and long-term reliability.

Purpose of the Study:

To introduce a new all-fiber gyroscope design.
To minimize sources of reflection and reduce coherent scattering.
To enhance the long-term stability and performance of fiber optic gyroscopes.

Main Methods:

Constructing all gyroscope components directly on a single, continuous optical fiber.
Utilizing a laser-diode light source to mitigate coherent scattering.

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Optimizing the modulation frequency to further reduce performance instabilities.

Main Results:

Elimination of localized reflection points through integrated fiber construction.
Significant reduction in coherent scattering effects.
Observed long-term stability at rest of better than 0.2 degrees per hour with a 30-second integration time.

Conclusions:

The novel all-fiber gyroscope design effectively minimizes reflection and scattering.
Optimized modulation frequency contributes to enhanced stability.
The demonstrated stability performance shows significant advancement for fiber optic gyroscope technology.