The simulation of V(Z) curve and it's application to isotropic materials using a lensless line-focus acoustic microscope

• Main Authors: Jyh-Horng Wu, 吳志弘
• Other Authors: Mao-Kuen Kuo
• Format: Others
• Language: zh-TW
• Published: 2001
• Online Access: http://ndltd.ncl.edu.tw/handle/03254322114089393254

碩士 === 國立臺灣大學 === 應用力學研究所 === 89 === The V(Z,t) curve and V(Z) curve of a lens-less line focus acoustic microscope is simulated in order to characterize material constants by using the acoustic microscope. Only isotropic, homogeneous, linear and elastic materials are considered in this study. The incident field of the acoustic microscope and the reflection field are first derived from the full wave equation. A electro-mechanical reciprocity theorem is then used to construct V(Z) and V(Z,t) curves theoretically. The computed V(Z) curves are finally used together with genetic algorithm to characterize material. The wave speeds of Rayleigh surface waves, the longitudinal waves, the transverse waves, and/or the thickness of the layer are characterized successfully.