Recovery of correlation function of internal random rough surfaces from diffusely scattered elastic waves
Recovery of correlation function of internal random rough surfaces from diffusely scattered elastic waves
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DOI：
10.1016/j.jmps.2016.11.003
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发表时间：
2017-02-01
影响因子：
5.3
通讯作者：
Craster, R. V.
中科院分区：
文献类型：
--
作者：
Shi, F.;Lowe, M. J. S.;Craster, R. V.
我们提出了一种超声方法来重建固体中远程不可访问的随机粗糙表面的高度相关函数。逆方法是基于基尔霍夫近似（KA），它需要通过发送窄带入射脉冲来测量漫散射强度的角分布。近场散射效应也考虑到菲涅耳假设。所提出的方法是成功地验证了通过模拟从多个实现的粗糙表面的相关函数是已知的散射，计算从这些接收到的信号的平均散射强度，然后部署这些逆方法来重建原始的相关函数。重建的相关函数和原来的非常好的协议被发现，在很宽的范围内的粗糙度参数。此外，减少实现的数量来近似平均强度的影响进行了研究，提供了实验的置信区间。利用相控阵有限扫描次数对波纹粗糙表面进行了实验，进一步验证了所提出的反演算法。
We propose an ultrasonic methodology to reconstruct the height correlation function of remotely inaccessible random rough surfaces in solids. The inverse method is based on the Kirchhoff approximation(KA), and it requires measuring the angular distribution of diffuse scattering intensities by sending in a narrow band incident pulse. Near field scattering effects are also included by considering the Fresnel assumption. The proposed approach is successfully verified by simulating the scattering from multiple realizations of rough surfaces whose correlation function is known, calculating the mean scattering intensities from these received signals, and then deploying the inverse method on these to reconstruct the original correlation function. Very good agreement between the reconstructed correlation function and the original is found, for a wide range of roughness parameters. In addition, the effect of reducing the number of realizations to approximate the mean intensity are investigated, providing confidence bounds for the experiment. An experiment on a corrugated rough surface is performed with a limited number of scans using a phased array, which further validates the proposed inversion algorithm.