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Related Experiment Video

Updated: Mar 24, 2026

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Guided Wave Tomography Based on Full-Waveform Inversion.

Jing Rao, Madis Ratassepp, Zheng Fan

    IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control
    |March 9, 2016
    PubMed
    Summary
    This summary is machine-generated.

    This study introduces a guided wave tomography method using Full Waveform Inversion (FWI) for precise wall thickness reconstruction in plates. The technique accurately maps defects, achieving thickness errors within 0.5 mm.

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    Area of Science:

    • Non-destructive testing
    • Ultrasonic guided waves
    • Wave propagation modeling

    Background:

    • Accurate assessment of material integrity is crucial in various engineering applications.
    • Existing methods for wall thickness reconstruction may lack the resolution for complex defect geometries.
    • Guided waves offer sensitivity to material variations and defects.

    Purpose of the Study:

    • To develop and validate a guided wave tomography method for high-resolution wall thickness reconstruction.
    • To accurately image irregularly shaped defects in isotropic plates.
    • To quantify the accuracy of the proposed method.

    Main Methods:

    • Utilized Full Waveform Inversion (FWI) in a 2D acoustic model for forward wave propagation simulation.
    • Incorporated higher-order effects like diffraction and multiple scattering in the frequency domain.
    • Employed iterative local optimization of waveform misfit between modeled and measured data across discrete frequencies.
    • Converted wave velocity maps to thickness maps using guided mode dispersion characteristics.

    Main Results:

    • Successfully reconstructed the thickness map of an irregularly shaped defect on a 10 mm thick plate.
    • Achieved high-resolution imaging of wall thickness variations.
    • Demonstrated a thickness error within 0.5 mm for the reconstructed defect.

    Conclusions:

    • The developed guided wave tomography method based on FWI provides accurate and high-resolution wall thickness reconstruction.
    • The method is effective for characterizing complex defects in isotropic plates.
    • FWI offers a promising approach for non-destructive evaluation and structural health monitoring.