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Guided wave diffraction tomography within the born approximation.

Pierre Belanger1, Peter Cawley, Francesco Simonetti

  • 1UK Research Centre in the NDE Department of Mechanical Engineering, Imperial College, London, UK. p.belanger06@imperial.ac.uk

IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control
|June 10, 2010
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Summary
This summary is machine-generated.

This study explores low-frequency guided wave diffraction tomography for detecting pipeline corrosion. A novel approach eliminates the need to measure the incident field, improving thickness reconstruction accuracy in structural health monitoring.

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Area of Science:

  • Non-destructive testing
  • Ultrasonic guided waves
  • Tomographic imaging

Background:

  • Corrosion detection in pipelines and pressure vessels is critical for the petrochemical industry.
  • Low-frequency guided wave diffraction tomography offers a promising method for evaluating large, partially accessible structures.
  • Accurate thickness reconstruction is essential for assessing structural integrity.

Purpose of the Study:

  • To investigate the feasibility of low-frequency guided wave diffraction tomography for corrosion detection.
  • To develop a novel approach for tomographic reconstruction that does not require measurement of the incident field.
  • To evaluate the accuracy of the proposed method through finite element simulations and experimental validation.

Main Methods:

  • Utilizing a 64-element circular array of transducers for data acquisition.
  • Employing finite element simulations to model wave propagation and scattering.
  • Implementing a baseline subtraction approach and a novel method for incident field measurement elimination.
  • Conducting experimental validation to assess reconstruction accuracy.

Main Results:

  • Finite element simulations confirm accurate thickness reconstruction when the Born approximation is satisfied.
  • The proposed method, which does not require incident field measurement, yields reconstructions similar to simulations.
  • Scattering from the transducer array was identified as a significant source of error in tomographic reconstruction.
  • Experimental results validate the effectiveness of the proposed approach under specific conditions.

Conclusions:

  • Low-frequency guided wave diffraction tomography is a viable technique for assessing large structures.
  • The novel approach effectively eliminates the need for incident field measurement, simplifying practical implementation.
  • Minimizing transducer array scattering is crucial for enhancing the accuracy of tomographic reconstructions in structural health monitoring.