Theory for optical detection of picosecond shear acoustic gratings
Theory for optical detection of picosecond shear acoustic gratings
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DOI：
10.1364/josab.33.002634
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发表时间：
2016-12-01
影响因子：
1.9
通讯作者：
Matsuda, Osamu
中科院分区：
文献类型：
--
作者：
Kouyate, Mansour;Pezeril, Thomas;Matsuda, Osamu
提出了一种描述探测激光诱导光栅外差探测平面非均匀剪切声波的理论公式。非均匀平面横波是一种纯横波，它具有平面相锋和机械位移矢量，其幅度在空间上是正弦调制的。它可以由激光诱导的光栅产生，并可用于千兆赫频率范围内亚微米厚的薄膜和涂层的声学测试。该理论从实验检测的可行性出发，揭示了该波在材料无损检测和基础研究中应用的潜在优势和不足。(C)2016年度美国光学学会
A theoretical formalism describing the heterodyne detection of plane inhomogeneous shear acoustic waves by probe laser-induced gratings is developed. An inhomogeneous plane shear acoustic wave is a purely shear wave with a plane phase front and mechanical displacement vector, which is sinusoidally spatially modulated in magnitude. It could be generated by laser-induced gratings and could be useful for the acoustic testing of sub-micrometer thick membranes and coatings in the gigahertz frequency range. The theory reveals the potential advantages and disadvantages of this wave application in non-destructive testing of materials and fundamental research from the point of view of the feasibility of their experimental detection. (C) 2016 Optical Society of America