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Related Experiment Video

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A Silicon-tipped Fiber-optic Sensing Platform with High Resolution and Fast Response
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Durable shape sensor based on FBG array inscribed in polyimide-coated multicore optical fiber.

Kirill Bronnikov, Alexey Wolf, Sergey Yakushin

    Optics Express
    |December 28, 2019
    PubMed
    Summary
    This summary is machine-generated.

    This study introduces a novel 3D shape sensor using fiber Bragg gratings (FBGs) in a 7-core optical fiber. It achieves high accuracy in reconstructing complex shapes, even at small bending radii.

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    Area of Science:

    • Optoelectronics
    • Fiber Optics Sensors
    • Materials Science

    Background:

    • Accurate shape sensing is crucial for advanced applications.
    • Existing fiber optic sensors face limitations in accuracy and minimum bending radius.

    Purpose of the Study:

    • To develop and validate a novel 3D quasi-continuous shape sensor.
    • To assess the sensor's accuracy, particularly at small bending radii.
    • To investigate factors influencing measurement accuracy.

    Main Methods:

    • Inscribing a Fiber Bragg Grating (FBG) array into a 7-core optical fiber using femtosecond laser pulses.
    • Utilizing a polyimide protective coating for durability.
    • Calibrating each FBG individually for precise measurements.
    • Reconstructing 2D and 3D shapes based on FBG strain data.

    Main Results:

    • The sensor successfully reconstructs 2D and 3D shapes with high accuracy.
    • Achieved measurement of bending radii down to 2.6 mm with approximately 1% accuracy.
    • Investigated error sources in curve and curvature radius reconstruction (2.6–500 mm).

    Conclusions:

    • The developed FBG sensor offers high-accuracy 3D shape reconstruction.
    • Its performance at small bending radii is a significant advancement.
    • The sensor's material properties (temperature resistance, mechanical strength) enable use in harsh environments, medical, and composite applications.