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Dynamic curvature sensing using time expanded ΦOTDR.

Camilo Escobar-Vera, Miguel Soriano-Amat, Hugo F Martins

    Optics Letters
    |August 15, 2023
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    A novel time-expanded phase-sensitive optical time-domain reflectometry (TE-ΦOTDR) technique enables distributed shape sensing up to 125 m. This advanced fiber optic sensor system offers high resolution and sampling rates for dynamic applications.

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    Area of Science:

    • Physics
    • Engineering
    • Materials Science

    Background:

    • Optical fiber sensors are crucial for shape sensing, employing methods like fiber Bragg gratings, OFDR, and OTDR.
    • Existing techniques face limitations in full distribution, dynamic sensing performance, or effective fiber length.

    Purpose of the Study:

    • To introduce a novel distributed curvature sensing system using multi-core fiber (MCF).
    • To address the performance gaps in current fiber shape sensing technologies.

    Main Methods:

    • Utilized a multi-core fiber (MCF) with three interrogated cores.
    • Implemented a novel time-expanded phase-sensitive optical time-domain reflectometry (TE-ΦOTDR) technique for interrogation.
    • Achieved distributed curvature sensing over a 125 m range.

    Main Results:

    • Demonstrated a 125 m sensing range with 10-cm resolution.
    • Achieved a high sampling rate of 50 Hz for dynamic sensing capabilities.
    • Successfully filled a critical performance gap in distributed fiber shape sensing.

    Conclusions:

    • The developed TE-ΦOTDR system offers a significant advancement in distributed shape sensing.
    • The system's capabilities open new possibilities for applications in civil engineering, medicine, and seismology.
    • This technology enhances the performance of fiber optic sensors for complex shape and curvature measurements.