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    A new time-domain slicing (TDS) method improves large strain sensing accuracy and spatial resolution in optical frequency domain reflectometry. This technique suppresses fake peaks, offering a sixfold increase in measurement precision without hardware changes.

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    Area of Science:

    • Optoelectronics
    • Fiber Optic Sensing
    • Metrology

    Background:

    • Optical frequency domain reflectometry (OFDR) is a key technique for high-resolution sensing.
    • Conventional methods struggle with large strain measurements due to spectral distortions and fake peaks.
    • Improving accuracy and spatial resolution in strain sensing remains a significant challenge.

    Purpose of the Study:

    • To propose and validate a time-domain slicing (TDS) method for enhanced large strain sensing.
    • To improve spatial resolution and measurement accuracy in OFDR systems.
    • To overcome limitations of conventional frequency domain slicing (FDS) methods.

    Main Methods:

    • Implementation of time-domain slicing (TDS) with Burg spectrum estimation.
    • Utilizing TDS to enhance local spectrum similarity under large strain conditions.
    • Experimental validation of the TDS method for strain measurement.

    Main Results:

    • Successful strain measurements ranging from 600 to 4200 µε.
    • Achieved a spatial resolution of 2.4 mm with a narrow 10 nm optical frequency scanning range.
    • Reduced root mean square error (RMSE) by six times, from 8.6611 µε to 1.3396 µε.
    • Demonstrated suppression of fake peaks during strain resolving.

    Conclusions:

    • The proposed TDS method significantly enhances accuracy and spatial resolution for large strain sensing.
    • TDS offers a superior alternative to FDS for strain measurement in optical fiber sensors.
    • This advancement provides a more precise and reliable method for structural health monitoring and other applications.