The effect of elastic anisotropy on contrast in the scanning acoustic microscope
The effect of elastic anisotropy on contrast in the scanning acoustic microscope
复制标题
弹性各向异性对扫描声学显微镜对比度的影响
DOI：
10.1080/01418618408234922
复制
发表时间：
1984
影响因子：
1.6
通讯作者：
C. Ilett
中科院分区：
文献类型：
--
作者：
M. Somekh;G. A. D. Briggss;C. Ilett
摘要考虑各向异性刚度张量，计算了多晶样品在扫描声显微镜中的对比度。所得到的信号随散焦的变化从根本上不同于可以用各向同性材料获得的信号，而不管弹性特性的值如何。在许多情况下，这主要是由于伪表面波的激发，其以类似于“泄漏”瑞利波的方式影响显微镜的响应。讨论了某些材料不能给出良好的晶粒结构声象的原因。
Abstract The contrast obtained with polycrystalline specimens in the scanning acoustic microscope is computed by taking account of the anisotropic stiffness tensor. The resulting variation of signal with defocus is fundamentally different from that which could be obtained with an isotropic material regardless of the values of the elastic properties. In many cases this results largely from the excitation of pseudo-surface waves which effect the response of the microscope in a similar manner to ‘leaky’ Rayleigh waves. The reasons why some materials fail to give good acoustic images of grain structure are discussed.