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Tomography refers to imaging by sections. Computed tomography (CT) is a non-invasive imaging technique that uses computers to analyze several cross-sectional X-rays to reveal minute details about structures in the body.
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Related Experiment Video

Updated: Oct 28, 2025

Imaging Corrosion at the Metal-Paint Interface Using Time-of-Flight Secondary Ion Mass Spectrometry
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Imaging Corrosion at the Metal-Paint Interface Using Time-of-Flight Secondary Ion Mass Spectrometry

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Guided Wave Tomography Based on Supervised Descent Method for Quantitative Corrosion Imaging.

Min Lin, Yang Liu

    IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control
    |July 14, 2021
    PubMed
    Summary
    This summary is machine-generated.

    Fast inversion tomography (FIT) accurately maps corrosion on plate-like structures. This ultrasonic method quantitatively estimates remaining thickness, outperforming traditional full-waveform inversion techniques.

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    Area of Science:

    • Materials Science
    • Non-destructive Testing
    • Ultrasonic Imaging

    Background:

    • Corrosion detection is crucial for structural integrity across various industries.
    • Guided wave tomography offers a promising approach for assessing remaining thickness in corroded components.

    Purpose of the Study:

    • To introduce and evaluate a novel ultrasonic quantitative tomography method, Fast Inversion Tomography (FIT), for precise corrosion mapping.
    • To assess FIT's performance in reconstructing thickness variations in plate-like structures.

    Main Methods:

    • FIT employs an offline training stage using the supervised descent method (SDM) to minimize waveform misfit.
    • An online inversion stage reconstructs velocity maps from learned descent directions.
    • Velocity maps are converted to thickness maps utilizing guided wave dispersion characteristics.

    Main Results:

    • FIT demonstrated high accuracy in quantitative corrosion imaging on synthetic aluminum plate datasets.
    • The method successfully mapped varying corrosion depths and shapes.
    • FIT showed comparable or superior reconstruction accuracy and computation efficiency against time/frequency-domain full-waveform inversion.

    Conclusions:

    • Fast Inversion Tomography (FIT) is an effective ultrasonic technique for quantitative corrosion mapping.
    • FIT offers a robust solution for estimating remaining thickness in corroded plate-like structures.
    • The method presents a significant advancement in non-destructive evaluation for corrosion assessment.