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    This study introduces pulse compression for ultrasonic guided waves, enhancing inspection resolution beyond traditional tone burst methods. The research optimizes excitation waveforms for clearer defect detection in materials like aluminum plates.

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    Area of Science:

    • Materials Science
    • Non-Destructive Testing
    • Acoustics

    Background:

    • Ultrasonic guided wave testing often uses tone burst excitation, limiting resolution due to waveform duration.
    • Dispersion in Lamb waves complicates signal interpretation and reduces inspection accuracy.

    Purpose of the Study:

    • To design optimal excitation waveforms for Lamb wave pulse compression to achieve high-resolution material inspection.
    • To overcome the resolution limitations of conventional tone burst excitation methods.

    Main Methods:

    • Investigated pulse compression performance of linear chirp (L-Chirp), nonlinear chirp (NL-Chirp), Barker code (BC), and Golay complementary code (GCC) signals.
    • Analyzed the influence of excitation frequency range on inspection resolution and developed a frequency range determination strategy.
    • Conducted experiments on an aluminum plate using various excitation signals and frequency ranges.

    Main Results:

    • Pulse compression significantly improved resolution compared to tone burst excitation.
    • Quantitative comparisons validated theoretical findings on waveform performance and frequency range optimization.
    • Demonstrated the robustness of the proposed waveform design method against dispersion compensation inaccuracies.

    Conclusions:

    • Pulse compression techniques, particularly with optimized waveforms, offer superior resolution for ultrasonic guided wave inspections.
    • The developed strategy for frequency range determination enhances the effectiveness of Lamb wave pulse compression.
    • This approach provides a more accurate and reliable method for material defect detection.