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Related Experiment Video

Updated: Jun 12, 2026

A Random-displacement Measurement by Combining a Magnetic Scale and Two Fiber Bragg Gratings
08:23

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

Published on: September 30, 2019

Fiber-optic rotary displacement sensor with wavelength encoding.

W B Spillman, P L Fuhr

    Applied Optics
    |June 10, 2010
    PubMed
    Summary

    This study introduces a novel fiber-optic sensor that uses a rotating waveplate to encode rotary displacement. The sensor detects changes in light intensity at specific wavelengths, enabling precise measurement of rotation.

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    Fiber optic linear displacement sensor based on a variable period diffraction grating.

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    Applied optics·2010

    Area of Science:

    • Optical Engineering
    • Sensor Technology
    • Photonics

    Background:

    • Rotary displacement sensing is crucial in various industrial applications.
    • Existing fiber-optic sensors may have limitations in precision or complexity.

    Purpose of the Study:

    • To develop and validate a new fiber-optic sensor for encoding rotary displacement.
    • To investigate the use of a retardation plate for signal modulation.

    Main Methods:

    • Utilizing a broadband optical signal and a retardation plate (waveplate).
    • Encoding rotary displacement as a notched minimum in the optical signal.
    • Measuring the wavelength shift of the intensity minimum as a function of rotation.

    Main Results:

    • Demonstrated a direct relationship between waveplate rotation and the wavelength of minimum intensity.
    • Theoretical predictions of sensor performance were developed.
    • Experimental results validated the theoretical model.

    Conclusions:

    • The developed fiber-optic sensor effectively measures rotary displacement using optical retardation.
    • The sensor's performance is predictable and experimentally verifiable.
    • This technology offers a promising approach for high-precision rotational sensing.

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