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Related Experiment Video

Updated: Jan 19, 2026

Fiber Optic Distributed Sensors for High-resolution Temperature Field Mapping
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High-resolution distributed shape sensing using phase-sensitive optical time-domain reflectometry and multicore

Łukasz Szostkiewicz, Marcelo A Soto, Zhisheng Yang

    Optics Express
    |September 13, 2019
    PubMed
    Summary

    This study introduces a novel distributed shape sensor using multicore fiber (MCF) and phase-sensitive optical time-domain reflectometry (φ-OTDR). The sensor achieves high strain sensitivity and accurately measures fiber shape changes, overcoming cross-sensitivity issues.

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    Area of Science:

    • Fiber optics sensing
    • Optical metrology
    • Distributed sensing systems

    Background:

    • Traditional shape sensing methods often face limitations in sensitivity, spatial resolution, and cross-sensitivity to environmental factors like temperature.
    • Multicore fibers (MCF) offer potential for enhanced sensing capabilities due to their complex internal structure.
    • Phase-sensitive optical time-domain reflectometry (φ-OTDR) is a technique for high-resolution distributed sensing.

    Purpose of the Study:

    • To propose and experimentally demonstrate a highly-sensitive distributed shape sensor.
    • To leverage multicore fiber (MCF) and phase-sensitive optical time-domain reflectometry (φ-OTDR) for shape sensing.
    • To overcome cross-sensitivity issues between strain and temperature in distributed sensing.

    Main Methods:

    • Utilizing a multicore fiber (MCF) as the sensing element.
    • Employing phase-sensitive optical time-domain reflectometry (φ-OTDR) for signal interrogation.
    • Experimentally validating the system's performance in terms of sensitivity, spatial resolution, and repeatability.

    Main Results:

    • Achieved high strain sensitivity down to approximately 0.3 µɛ over a 24 m MCF.
    • Demonstrated a spatial resolution of 10 cm for shape measurements.
    • Successfully retrieved fiber shape changes, detecting displacements as small as 50 µm.
    • Showcased the technique's ability to overcome cross-sensitivity between strain and temperature.

    Conclusions:

    • The proposed MCF-based φ-OTDR system represents the first demonstration of distributed shape sensing using this combination.
    • The developed sensor exhibits high sensitivity, good repeatability, and robustness against temperature variations.
    • This technique holds significant promise for advanced applications in dynamic, long-distance, and 3D distributed shape sensing.