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Related Experiment Videos

Multi-mode Lamb wave tomography with arrival time sorting.

Kevin R Leonard1, Mark K Hinders

  • 1Department of Applied Science, College of William and Mary, Williamsburg, Virginia 23187-8795, USA.

The Journal of the Acoustical Society of America
|May 19, 2005
PubMed
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This study enhances Lamb wave tomography for nondestructive evaluation by accurately reconstructing images using multiple wave modes. A novel sorting algorithm addresses signal interference, improving structural integrity analysis of platelike materials.

Area of Science:

  • Materials Science
  • Nondestructive Evaluation
  • Ultrasonic Testing

Background:

  • Lamb wave tomography is an effective nondestructive evaluation (NDE) technique for platelike structures.
  • Traditional methods often rely on the first arriving wave mode for time-of-flight measurements and tomographic reconstructions.
  • Analyzing multiple wave modes offers enhanced sensitivity to different flaw types, improving structural integrity assessment.

Purpose of the Study:

  • To demonstrate the capability of Lamb wave tomography to generate accurate reconstructions using multiple wave modes.
  • To address the challenge of signal interference that can cause wave modes to disappear.
  • To introduce a sorting algorithm for accurate extraction of multi-mode arrival times.

Main Methods:

  • Utilizing pitch-catch measurements from ultrasonic transducers at various orientations.

Related Experiment Videos

  • Performing tomographic reconstructions based on time-of-flight data.
  • Employing a novel sorting algorithm involving multiple frequency scans (frequency walking) to sort arrival times into their correct mode series.

    • Main Results:

    • Accurate tomographic reconstructions were achieved using multiple Lamb wave modes.
    • The developed sorting algorithm effectively counteracts signal interference issues.
    • Multi-mode analysis provides improved insights into material structural integrity.

    Conclusions:

    • Lamb wave tomography can be effectively utilized with multiple modes for enhanced NDE.
    • The frequency walking sorting algorithm successfully addresses multi-mode arrival time extraction challenges.
    • Multi-mode analysis significantly improves the understanding of structural integrity in inspected materials.