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Dual-layer orthogonal fiber Bragg grating mesh based soft sensor for 3-dimensional shape sensing.

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    |October 19, 2017
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    This study introduces a novel soft shape sensor using dual-layer fiber Bragg grating (FBG) arrays for accurate 3D object shape measurement. The sensor enables precise, visualized 3D shape reconstruction with practical applications in soft robotics and biomedicine.

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    Area of Science:

    • Materials Science
    • Optical Engineering
    • Robotics

    Background:

    • Accurate 3D shape measurement is crucial for advanced applications.
    • Existing soft sensors often lack multi-directional sensing capabilities.
    • Fiber Bragg gratings (FBGs) offer a promising basis for strain and curvature sensing.

    Purpose of the Study:

    • To demonstrate a novel soft shape sensor for 3D object shape measurement.
    • To enable multi-point, bi-directional shape sensing using an orthogonal mesh structure.
    • To achieve visualized 3D shape reconstruction with high accuracy.

    Main Methods:

    • Utilized dual-layer fiber Bragg grating (FBG) arrays in an orthogonal mesh structure.
    • Implemented bi-directional curvature measurement by analyzing wavelength shifts in off-center FBGs.
    • Employed a curve fitting method for 3D shape reconstruction based on curvature data.

    Main Results:

    • Achieved multi-point, bi-directional shape sensing.
    • Demonstrated a measurement error of approximately 2.7% on the bending radius.
    • Successfully reconstructed visualized 3D shapes of object surfaces.

    Conclusions:

    • The developed soft shape sensor provides accurate and visualized 3D shape measurement.
    • The orthogonal FBG mesh design enables effective bi-directional curvature sensing.
    • This technology holds significant potential for soft robotics and biomedical applications.