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Related Experiment Videos

Ultrasonic wavefield inversion and migration in complex heterogeneous structures: 2D numerical imaging and

Luan T Nguyen1, Ryan T Modrak2

  • 1International Geothermal Centre, Bochum University of Applied Sciences, Bochum, Germany.

Ultrasonics
|October 9, 2017
PubMed
Summary

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This study introduces a two-step ultrasonic waveform tomography method to improve defect detection in engineered structures. The new workflow enhances computational efficiency and accuracy for identifying small defects, even in challenging scenarios.

Area of Science:

  • Geophysics
  • Materials Science
  • Non-Destructive Testing

Background:

  • Detecting small defects in engineered structures using ultrasonic waves is challenging due to resolution limits.
  • Current ultrasonic waveform tomography requires computationally intensive simulations and accurate background models, risking missed or inaccurate defect imaging.

Purpose of the Study:

  • To develop a more computationally efficient and accurate method for detecting small defects in engineered structures using ultrasonic waveform tomography.
  • To improve the imaging of defects, especially those located along existing interfaces in composite materials.

Main Methods:

  • A two-step waveform tomography approach was developed, separating low-frequency background model building from high-frequency defect imaging.
  • The first step utilizes waveform inversion for wavespeed parameters, while the second employs time reversal migration for reflectivity.
Keywords:
Full-waveform inversionNondestructive testingReverse-time migrationUltrasonics

Related Experiment Videos

  • Synthetic test cases and related experiments were used to validate the workflow.

    • Main Results:

    • The two-step workflow demonstrated superior performance compared to single-step inversion in synthetic tests.
    • The method successfully imaged defects in challenging scenarios, such as those along existing layer interfaces in composite bridge decks.
    • The workflow showed robustness against noisy data and inaccurate source parameters.

    Conclusions:

    • The proposed two-step ultrasonic waveform tomography method is a promising approach for enhanced defect detection in engineered structures.
    • This workflow offers improved computational efficiency and accuracy, particularly for small defects and complex structural interfaces.
    • The findings suggest a more reliable non-destructive evaluation technique for critical infrastructure.