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Related Experiment Video

Updated: Jul 29, 2025

A Random-displacement Measurement by Combining a Magnetic Scale and Two Fiber Bragg Gratings
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Two-dimensional vector bending sensor based on a hole-assisted three-core fiber coupler.

Jing Yang, Feng Zou, Chunying Guan

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    |May 23, 2023
    PubMed
    Summary
    This summary is machine-generated.

    This study presents a novel two-dimensional vector bending sensor using a hole-assisted three-core fiber (HATCF) coupler. The sensor accurately detects bending curvature and direction with high sensitivity and low temperature cross-sensitivity.

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    Area of Science:

    • Photonics and Optical Sensing
    • Fiber Optic Sensors
    • Material Science

    Background:

    • Fiber optic sensors offer advantages like immunity to electromagnetic interference and remote sensing capabilities.
    • Accurate measurement of bending curvature and direction is crucial for various applications, including structural health monitoring and robotics.
    • Existing sensors often face limitations in multi-dimensional measurement and sensitivity.

    Purpose of the Study:

    • To develop and demonstrate a novel two-dimensional vector bending sensor.
    • To investigate the performance characteristics of the proposed sensor, including sensitivity and directionality.
    • To evaluate the sensor's cross-sensitivity to temperature variations.

    Main Methods:

    • Fabrication of the sensor by splicing a hole-assisted three-core fiber (HATCF) between two single-mode fibers (SMFs).
    • Utilizing the resonance coupling between the center and suspended cores of the HATCF.
    • Observing and analyzing two discrete resonance dips in the optical spectrum.
    • Investigating the sensor's response to bending over a 360° range of directions and varying curvatures.
    • Measuring temperature sensitivity.

    Main Results:

    • The sensor successfully demonstrated two discrete resonance dips due to core couplings.
    • The bending curvature and direction were accurately identified by monitoring the wavelengths of the two resonance dips.
    • A maximum curvature sensitivity of -50.62 nm/m⁻¹ was achieved at the 0° direction.
    • The sensor exhibited low temperature sensitivity, measured at less than -34.9 pm/°C.

    Conclusions:

    • The proposed HATCF-based sensor is effective for two-dimensional vector bending measurement.
    • The sensor offers high sensitivity and directional identification capabilities.
    • The low temperature sensitivity makes it suitable for practical applications in diverse environments.