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

Published on: September 30, 2019

Linear birefringence effects on fiber-optic current sensors.

P R Forman, F C Jahoda

    Applied Optics
    |June 10, 2010
    PubMed
    Summary

    Linear birefringence in fiber optics, caused by stress, can affect measurements. A specific polarizer orientation minimizes errors in detecting current-induced circular birefringence, with calculated error limits provided.

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    Optics letters·2009

    Area of Science:

    • Optics and Photonics
    • Fiber Optic Sensing
    • Electromagnetism

    Background:

    • Linear birefringence is an inherent property of optical fibers, often exacerbated by external stresses like bending and pressure during experimental deployment.
    • Intrinsic birefringence can be minimized, but stress-induced linear birefringence presents a significant challenge in precise optical measurements.
    • Measuring current-induced circular birefringence is complicated by the presence of this extraneous linear birefringence and a circular birefringence bias from fiber twist.

    Purpose of the Study:

    • To investigate the impact of stress-induced linear birefringence on the measurement of current-induced circular birefringence in optical fibers.
    • To develop a method for minimizing errors caused by extraneous linear birefringence during measurements.
    • To quantify the error limits associated with current measurements under specific experimental conditions.

    Main Methods:

    • Studied the effects of extraneous linear birefringence on current-induced circular birefringence measurements.
    • Employed a prescribed procedure for orienting the analyzing polarizer to minimize measurement errors.
    • Calculated quantitative error limits for current measurements based on fiber coil radii and winding tensile stress.

    Main Results:

    • A specific polarizer orientation was identified to significantly reduce measurement errors.
    • Quantitative error limits were calculated for current measurements, considering factors like fiber coil radius and tensile stress.
    • The study identified additional restrictions for fiber lead-in and lead-out sections to further improve measurement accuracy.

    Conclusions:

    • Proper orientation of the analyzing polarizer is crucial for accurate measurement of current-induced circular birefringence in the presence of linear birefringence.
    • The study provides a framework for understanding and mitigating errors in fiber optic sensing applications.
    • The findings offer practical guidelines for experimental setup to ensure reliable current measurements using optical fibers.

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