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Phase shift migration for imaging layered objects and objects immersed in water.

Tomas Olofsson1

  • 1Department of Engineering Sciences, Uppsala University, Uppsala, Sweden. tomas.olafsson@signal.uu.se

IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control
|November 3, 2010
PubMed
Summary
This summary is machine-generated.

Phase shift migration enhances ultrasonic imaging for layered and water-immersed objects. This frequency domain method efficiently produces high-resolution, low-noise images, even with scatterers in different media.

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Area of Science:

  • Non-destructive testing
  • Ultrasonic imaging
  • Seismic imaging techniques

Background:

  • Traditional ultrasonic imaging faces challenges with layered or immersed objects.
  • Reflection seismology offers advanced migration techniques.
  • Frequency domain methods can improve image reconstruction.

Purpose of the Study:

  • To adapt phase shift migration for ultrasonic imaging.
  • To evaluate its performance on layered and water-immersed objects.
  • To assess simultaneous imaging of scatterers in diverse media and depths.

Main Methods:

  • Phase shift migration, a frequency domain technique adapted from seismology.
  • Application to immersion test data of a block with side-drilled holes and a water scatterer.
  • Testing on a copper block with flat bottom holes.

Main Results:

  • Successful high-resolution and low-noise imaging of layered objects.
  • Effective imaging of objects immersed in water.
  • Demonstrated capability for simultaneous imaging of scatterers in different media and depths.

Conclusions:

  • Phase shift migration is a viable and effective technique for ultrasonic imaging of complex objects.
  • The method offers significant advantages in resolution and noise reduction.
  • It shows promise for non-destructive evaluation in various industrial applications.