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Related Concept Videos

Measurements of Strain01:27

Measurements of Strain

2.7K
Strain quantifies the deformation of a material under force, typically measured as normal strain, which represents the change in length when compared with the original length. Electrical strain gauges are used for enhanced accuracy. These devices consist of a conductive wire mounted on a paper backing that adheres to the material's surface. These gauges operate on the piezoresistive effect, where the wire's electrical resistance changes in response to mechanical deformation. The strain...
2.7K

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A Random-displacement Measurement by Combining a Magnetic Scale and Two Fiber Bragg Gratings
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In-fiber Fabry-Perot interferometer for strain and magnetic field sensing.

Greice K B Costa, Paula M P Gouvêa, Larissa M B Soares

    Optics Express
    |July 14, 2016
    PubMed
    Summary

    This study presents an in-fiber Fabry-Perot interferometer (FPI) for enhanced strain and magnetic field sensing. The FPI sensor demonstrates superior magnetic field sensitivity and improved temperature stability compared to Fiber Bragg Grating (FBG) sensors.

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    Area of Science:

    • Optoelectronics
    • Fiber Optic Sensors
    • Materials Science

    Background:

    • Fiber optic interferometers offer sensitive measurement capabilities.
    • Magnetostrictive materials and magnetic fields are crucial for advanced sensing applications.
    • Fiber Bragg Gratings (FBGs) are commonly used but have limitations in certain sensing scenarios.

    Purpose of the Study:

    • To investigate the performance of an in-fiber Fabry-Perot interferometer (FPI) for strain and magnetic field sensing.
    • To compare the sensitivity and temperature stability of the FPI sensor with Fiber Bragg Grating (FBG) based sensors.

    Main Methods:

    • An intrinsic FPI was fabricated by splicing a capillary optical fiber section between standard telecommunication fibers.
    • The FPI sensor was integrated with a magnetostrictive alloy and a small magnet for magnetic field and force sensing.
    • Performance metrics including magnetic field sensitivity and temperature cross-sensitivity were evaluated.

    Main Results:

    • The FPI sensor exhibited over four times higher sensitivity to magnetic fields compared to FBG sensors.
    • The FPI sensor demonstrated approximately ten times lower sensitivity to temperature variations.
    • The sensor configurations proved effective for detecting both magnetic fields and applied forces.

    Conclusions:

    • In-fiber FPI sensors offer a promising alternative to FBGs for magnetic field and strain sensing.
    • The developed FPI sensor design provides enhanced magnetic field sensitivity and improved temperature resilience.
    • This technology has potential applications in various fields requiring precise physical parameter monitoring.