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Updated: Jun 20, 2026

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

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

Published on: September 30, 2019

Dual-input fiber-optic gyroscope.

S C Rashleigh¹, W K Burns

¹US Naval Research Laboratory, Washington, DC 20375, USA.

|August 25, 2009

Summary

This study optimizes fiber-optic gyroscope sensitivity by using specific phase differences in its dual inputs. This method achieves maximum sensitivity, enabling precise measurement of rotation rates.

Area of Science:

Optics and Photonics
Inertial Navigation Systems
Optical Sensing

Background:

Fiber-optic gyroscopes (FOGs) are crucial for inertial navigation.
Maximizing FOG sensitivity is key to improving rotation rate detection.
Interferometer operation point significantly impacts FOG performance.

Purpose of the Study:

To achieve maximum sensitivity in a fiber-optic gyroscope.
To investigate the relationship between input conditions and Sagnac interferometer operation.
To demonstrate a high-sensitivity FOG configuration.

Main Methods:

Operating the fiber-optic gyroscope with two equal-intensity input beams.
Introducing a specific phase difference between the input beams at the beam splitter.

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A Silicon-tipped Fiber-optic Sensing Platform with High Resolution and Fast Response

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Utilizing the principle of reciprocity to maintain the Sagnac interferometer at quadrature.

Main Results:

Maximum sensitivity was achieved when input beams had equal intensity and a specific phase difference.
The Sagnac interferometer was confirmed to be at quadrature under these conditions.
A sensitivity of approximately 0.93 rad/°/sec was demonstrated.
A minimum-detectable rotation rate of 0.4 deg/sec was achieved.

Conclusions:

Operating a fiber-optic gyroscope at maximum sensitivity is feasible by controlling input beam properties.
The quadrature condition is essential for achieving optimal sensitivity in reciprocal Sagnac interferometers.
The demonstrated performance highlights the potential for improved rotation sensing applications.