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Sample Drift Correction Following 4D Confocal Time-lapse Imaging
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Experimental implementation of reverse time migration for nondestructive evaluation applications.

Brian E Anderson1, Michele Griffa, Pierre-Yves Le Bas

  • 1Acoustics Research Group, Department of Physics and Astronomy, Brigham Young University, N283 Eyring Science Center, Provo, Utah 84602, USA. bea@byu.edu

The Journal of the Acoustical Society of America
|February 10, 2011
PubMed
Summary
This summary is machine-generated.

Reverse time migration (RTM) can now image defects in materials, overcoming limitations in standard seismic applications. This novel approach successfully locates scatterers and disbonding in aluminum samples using a fully experimental method.

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Area of Science:

  • Non-destructive evaluation (NDE)
  • Seismic imaging
  • Wave propagation analysis

Background:

  • Standard reverse time migration (RTM) is limited by its inability to handle multiple scattering, restricting its use in non-destructive evaluation (NDE).
  • Bounded samples in NDE inherently involve reverberation, posing a challenge for conventional RTM.
  • Previous RTM implementations in geophysics are not fully experimental.

Purpose of the Study:

  • To adapt and experimentally implement Reverse Time Migration (RTM) for NDE applications in bounded samples.
  • To address the challenge of reverberation in NDE using RTM.
  • To develop a modified RTM imaging condition for precise defect localization.

Main Methods:

  • A fully experimental Reverse Time Migration (RTM) procedure was developed and applied.
  • A modified RTM imaging condition was implemented to enhance defect detection.
  • Experiments were conducted on aluminum samples containing controlled scatterers and disbonding.

Main Results:

  • The modified RTM successfully localized scatterers within the aluminum samples.
  • Disbonding locations were accurately identified using the experimental RTM approach.
  • The study demonstrated the feasibility of RTM in NDE for bounded media.

Conclusions:

  • Reverse Time Migration (RTM) is a viable and effective imaging technique for NDE in bounded samples.
  • The developed experimental RTM method overcomes previous limitations related to reverberation.
  • This work opens new possibilities for RTM applications in material science and engineering.