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Related Experiment Videos

Lamb wave tomography of pipe-like structures.

Kevin R Leonard1, Mark K Hinders

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

Ultrasonics
|June 14, 2005
PubMed
Summary

This study introduces a new meridional-array scheme for helical ultrasound tomography to detect pipe flaws. The method shows promise for locating and sizing internal wall-thinning defects using guided ultrasonic waves.

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Area of Science:

  • Non-destructive testing
  • Ultrasonic wave propagation
  • Materials science

Background:

  • Lamb waves are guided ultrasonic plate waves suitable for inspecting curved structures like pipes.
  • Tomographic reconstruction using ultrasonic waves can locate and size flaws in materials.

Purpose of the Study:

  • To develop and validate a meridional-array scheme for helical ultrasound tomography.
  • To improve flaw detection and characterization in pipe-like structures.

Main Methods:

  • Utilizing helically propagating Lamb waves transmitted and received by longitudinal transducers.
  • Implementing a meridional-array scheme mimicking axial transducer placement.
  • Applying frequency compounding to enhance reconstruction quality.

Main Results:

  • Proof-of-concept results demonstrate the meridional-array scheme's ability to detect internal wall-thinning.
  • Improved tomographic reconstructions were achieved for helical ultrasound tomography with circumferential transducer rings.
  • Frequency compounding effectively reduced noise and artifacts in reconstructions.

Conclusions:

  • The meridional-array scheme is a viable approach for flaw detection in pipes using helical ultrasound tomography.
  • Helical ultrasound tomography, particularly with frequency compounding, offers enhanced capabilities for non-destructive evaluation of pipes.

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