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Authors: Yuantian Huang (Central South University) , Yongfeng Song (Central South University) , Xiongbing Li (Central South University) , Joseph A. Turner (University of Nebraska–Lincoln)
Diffuse ultrasonic backscatter techniques are commonly used for microstructure evaluation and defect detection, however, the sensitivity of these measurements is highly dependent on grain noise. Traditional single scattering models have been very effective for a large class of weakly scattering materials including magnesium and aluminum alloys. However, while it appears to break down for strong scattering materials. Longitudinal-longitudinal double scattering response models have been established for strongly scattering materials such as iron, copper and nickel-based alloys. In order to complete this double scattering theory, the transverse-to-transverse double scattering model is developed within the previous formalism based on Wigner distribution functions. This model is then combined with extreme value statics to detect the subwavelength, near-surface flaws in strongly scattering material. Experiments show that the developed method has good performance for suppressing both missed detections and false positives.
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How to Cite: Huang, Y. . , Song, Y. . , Li, X. . & Turner, J. A. (2019) “Transverse-to-transverse diffuse ultrasonic double scattering”, Review of Progress in Quantitative Nondestructive Evaluation.(0).