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Three-parameter measurement optical fiber sensor based on a hybrid structure.

Tong Nan, Bo Liu, Yongfeng Wu

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    |September 25, 2020
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    Summary

    This study introduces a novel hybrid optical fiber sensor capable of simultaneously measuring curvature, temperature, and transverse load. Its unique design offers high sensitivity and low crosstalk for multi-parameter sensing applications.

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    Area of Science:

    • Photonics and Optical Sensing
    • Fiber Optic Sensors
    • Interferometry

    Background:

    • Accurate multi-parameter sensing is crucial in various fields.
    • Existing fiber optic sensors often face limitations in simultaneous measurement capabilities.
    • Developing integrated sensors for simultaneous detection of physical parameters is an active research area.

    Purpose of the Study:

    • To propose and demonstrate a novel hybrid-structured optical fiber sensor.
    • To enable simultaneous measurement of curvature, temperature, and transverse load.
    • To evaluate the sensor's performance characteristics, including sensitivity and cross-sensitivity.

    Main Methods:

    • Fabrication of a hybrid fiber structure by fusing hollow-core fiber (HCF) between an air bubble and an up-taper.
    • Utilizing the air bubble as a Fabry-Perot interferometer (FPI) for transverse load sensing.
    • Employing the FPI and Mach-Zehnder interferometer (MZI) for simultaneous temperature and curvature measurements.
    • Demodulating reflection spectrum of FPI for transverse load, MZI wavelength shift for temperature, and ARROW intensity change for curvature.

    Main Results:

    • The sensor successfully achieved simultaneous measurement of curvature, temperature, and transverse load.
    • Transverse load sensitivity of the FPI was measured at 1.53 nm/N.
    • Curvature sensitivity was 33.23 dB/m⁻¹, and temperature sensitivity was 20.3 pm/°C.
    • Low cross-sensitivity of 0.0003 m⁻¹/°C was achieved.

    Conclusions:

    • The proposed hybrid-structured optical fiber sensor is effective for multi-parameter measurement.
    • The sensor exhibits high sensitivity, low crosstalk, and ease of manufacture.
    • This technology holds promise for advanced applications requiring simultaneous sensing of multiple physical parameters.