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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

Optical fiber rotary displacement sensor.

S T West, C L Chen

    Applied Optics
    |June 18, 2010
    PubMed
    Summary
    This summary is machine-generated.

    This study introduces a novel fiber optic twist sensor for measuring shaft angular position. This simple, effective sensor offers a promising alternative to traditional rotary sensors in manufacturing.

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    Area of Science:

    • Optoelectronics
    • Fiber optics
    • Sensor technology

    Background:

    • Shaft operation and control are crucial in manufacturing systems.
    • Measuring shaft angular position is a common industrial requirement.
    • Conventional rotary sensors have limitations.

    Purpose of the Study:

    • To develop a simple, viable alternative to conventional rotary sensors.
    • To report a class of multimode fiber intensity sensors for angular position measurement.
    • To investigate the performance of fiber optic twist sensors.

    Main Methods:

    • Utilizing a multimode fiber with specific core/N.A. properties sandwiched between low N.A. fibers.
    • Exciting selected modes within the multimode fiber section.
    • Measuring changes in optical power distribution due to fiber twisting and mode coupling.

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    Last Updated: Jun 12, 2026

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

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    Published on: September 30, 2019

    Fiber Optic Distributed Sensors for High-resolution Temperature Field Mapping
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    Main Results:

    • Demonstrated a functional fiber optic twist sensor with a usable range of 135-160 degrees.
    • Observed mode coupling and power redistribution in the multimode fiber upon twisting.
    • Estimated a sensitivity of 0.029' for prototype sensors with no evidence of hysteresis.

    Conclusions:

    • The developed multimode fiber intensity sensor is a viable alternative for shaft angular position measurement.
    • The sensor's design based on mode coupling in twisted fiber is effective.
    • Further development could enhance sensitivity and broaden applications in industrial systems.