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Transverse-to-transverse diffuse ultrasonic double scattering
Ultrasonics ( IF 4.2 ) Pub Date : 2021-03-01 , DOI: 10.1016/j.ultras.2020.106301
Yuantian Huang , Joseph A. Turner , Yongfeng Song , Xiongbing Li

Previously, a transverse-to-transverse single scattering model (T-T SSR) was developed for a pulse echo configuration, which may have limitations for strongly scattering materials. In this work, a transverse-to-transverse double scattering model (T-T DSR) is presented to model the transverse ultrasonic backscatter more accurately. First, the Wigner distribution of the transducer beam pattern is extended to a transverse wave. Next, the multiple scattering framework is followed to derive the transverse and longitudinal components of the second-order scattering. Then, a quasi-Monte Carlo (QMC) method is used with Graphics Processing Unit (GPU) acceleration to calculate numerical results of the final expression which contains a five-dimensional integral. The correlation length, the focal length of the transducer, and incident angle are used to investigate differences between the T-T DSR model and the T-T SSR model. Finally, a backscatter experiment is performed on two stainless steel specimens with different grain sizes to determine the respective correlation lengths. The results show that the T-T DSR model has better performance over the T-T SSR model for evaluating the grain size of these relatively strongly-scattering specimens.

中文翻译:

横向到横向的漫反射超声双散射

以前,为脉冲回波配置开发了横向到横向单一散射模型 (TT SSR),这可能对强散射材料有限制。在这项工作中,提出了一种横向到横向的双散射模型(TT DSR)来更准确地模拟横向超声反向散射。首先,换能器波束图的 Wigner 分布扩展到横波。接下来,遵循多重散射框架以推导出二阶散射的横向和纵向分量。然后,使用拟蒙特卡罗 (QMC) 方法和图形处理单元 (GPU) 加速来计算包含五维积分的最终表达式的数值结果。相关长度,换能器的焦距,和入射角用于研究 TT DSR 模型和 TT SSR 模型之间的差异。最后,对两个不同晶粒尺寸的不锈钢试样进行了反向散射实验,以确定各自的相关长度。结果表明,在评估这些相对强散射试样的晶粒尺寸时,TT DSR 模型比 TT SSR 模型具有更好的性能。
更新日期:2021-03-01
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