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Defect imaging via adjoint-state-based Reverse-time Migration
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DOI：10.1016/j.ndteint.2025.103425.png)
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Abstract
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• A reverse-time migration method based on adjoint-tomography theory is developed. • Material-based imaging conditions are explored in drilled hole ultrasound imaging. • Longitudinal wavespeed imaging condition best sizes large-midsize holes. • Density and impedance imaging conditions best sizes smallest holes. • In comparison to total focusing method, cross-correlation methods more specialized.
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