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Guided wave tomography with an improved scattering model.

P Huthwaite1

  • 1Imperial College London , Mechanical Engineering, Exhibition Road, London SW7 2AZ, UK.

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Summary

This study introduces an advanced guided wave tomography method for accurate corrosion mapping in the petrochemical industry. The new technique improves defect imaging resolution and reliability, crucial for asset integrity assessment.

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guided wavesimagingscatteringtomography

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Area of Science:

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

Background:

  • Accurate corrosion thickness mapping is vital for petrochemical industry asset integrity.
  • Guided wave tomography offers a non-invasive solution for mapping corrosion damage.
  • Traditional methods using dispersion relationships are inaccurate for non-uniform defects.

Purpose of the Study:

  • To develop a sophisticated inversion solution for guided wave tomography.
  • To improve the accuracy and resolution of corrosion thickness maps.
  • To account for complex guided wave scattering from defects.

Main Methods:

  • Utilizing guided wave tomography with advanced tomographic imaging.
  • Developing a novel inversion algorithm that considers full guided wave scattering.
  • Validating the method with simulated and experimental corrosion data.

Main Results:

  • Achieved higher resolution imaging (better than one wavelength) compared to traditional methods (two wavelengths).
  • Demonstrated accurate thickness map generation even with complex scattering.
  • Validated the algorithm's speed, stability, and robustness against noise and errors.

Conclusions:

  • The developed sophisticated inversion solution significantly enhances guided wave tomography for corrosion assessment.
  • This advanced method provides more accurate and higher-resolution thickness maps than traditional approaches.
  • The technique is reliable and suitable for real-world applications in the petrochemical industry.