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Efficient immersion imaging of components with nonplanar surfaces.

Jie Zhang, Bruce Drinkwater, Paul Wilcox

    IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control
    |July 30, 2014
    PubMed
    Summary

    This study presents an efficient ultrasonic array inspection method for nonplanar surfaces. It accurately computes time delays for immersion testing, minimizing signal amplitude reduction for better component imaging.

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    Area of Science:

    • Non-destructive testing
    • Ultrasonic imaging
    • Materials science

    Background:

    • Ultrasonic array inspection is crucial for evaluating components.
    • Nonplanar surfaces pose challenges for traditional ultrasonic methods.
    • Accurate coupling and time delay calculations are essential for reliable imaging.

    Purpose of the Study:

    • To develop an efficient method for computing element time delays in immersion ultrasonic array inspection of components with nonplanar surfaces.
    • To maintain measurement accuracy without compromising imaging quality.
    • To enable effective non-destructive evaluation of complex geometries.

    Main Methods:

    • Ultrasonic measurement of component surface geometry to define the surface profile.
    • Grid search algorithm to determine shortest propagation time paths through surface points.
    • Linear interpolation of propagation times from a coarse mesh to image pixels.
    • Development of an analytical model to assess the impact of time delay errors on signal amplitude.

    Main Results:

    • The proposed method efficiently computes time delays for immersion ultrasonic array inspection of nonplanar surfaces.
    • Surface geometry can be adequately described by points spaced by one wavelength for metallic components with a minimum surface radius of 30 wavelengths.
    • Time delays can be computed on a coarse grid with points spaced at 3 wavelengths.
    • Signal amplitude reduction for a point target is less than 1 dB under specified conditions.

    Conclusions:

    • The developed method provides an accurate and efficient approach for ultrasonic array inspection of components with nonplanar surfaces in immersion.
    • The findings demonstrate that precise surface characterization and optimized time delay calculations are key to high-fidelity ultrasonic imaging.
    • This technique enhances the capability of non-destructive testing for complex-shaped components, ensuring structural integrity assessment.