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Analytical reverse time migration with new imaging conditions for one-sided nondestructive evaluation of concrete
Aziz Asadollahi1, Lev Khazanovich2
1University of Minnesota, Department of Civil, Environmental and Geo-Engineering, 500 Pillsbury Drive SE, Minneapolis, MN 55455, United States.
Abstract:
Cross-correlation imaging condition of reverse time migration generates high-amplitude artifacts in the reconstructed images. In addition, due to geometrical spreading and scattering attenuations, this imaging condition assigns amplitudes to the points of the reconstructed image that are not a true representative of the reflection coefficient of the scanned medium at those points. These all can lead to a reduction in quality and misinterpretation of the reconstructed images. In this paper, we proposed new imaging conditions to mitigate high-amplitude artifacts and to assign more accurate amplitudes to an RTM image by considering geometrical spreading and scattering attenuation in concrete members when horizontal shear waves are used for imaging. We used data obtained by transmitting horizontal shear waves to 3D synthetic homogeneous and concrete specimens and demonstrated the effectiveness of the new imaging conditions.
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