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Non-stationary phase shift migration for flaw detection in objects with lateral velocity variations

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This paper proposes the non-stationary phase shift method for imaging layered objects and objects immersed in water with lateral velocity variations. The method presented allows inspection of both objects with complex geometry where the surface is not perpendicular to the axis of the transducer and layered objects where the layers are not horizontal. The method was originally developed for seismic data imaging and was implemented in the frequency domain, which ensures computational efficiency.

The performance of the method was tested in simulations of a layered object and an object with a concave surface and defects located below it. To verify the simulations, an experiment was performed with an immersed, tilted sample with side-drilled holes and another experiment with a sample with a concave surface. The results presented verify that the method allows image reconstruction with high resolution that is depth-independent and with a high signal-to-noise ratio.
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Document Type: Research Article

Publication date: September 1, 2014

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