Measurements of local elastic moduli by amplitude and phase acoustic microscope |
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| Authors: | Masahiro Nishida Tomio Endo Tadaharu Adachi Hiroyuki Matsumoto |
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| Affiliation: | aDepartment of Mechanical Engineering and Science, Tokyo Institute of Technology, 2-12-1, O-okayama, Meguro-ku, Tokyo 152, Japan;bProduct Development Department, Olympus Optical Co., Ltd., 2951, Ishikawa-cho, Hachioji-shi, Tokyo, 192, Japan |
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| Abstract: | A new method is suggested for the nondestructive measurement of elastic moduli in a localized area, 100–400 μm in diameter, by the complex V(z) curve using an amplitude and phase acoustic microscope. The inverse Fourier transform of the complex V(z) curve contains the reflectance function of a liquid-specimen interface. Therefore, the longitudinal, transverse and Rayleigh wave velocities for the specimen are simultaneously obtained by the inversion of the complex V(z) curve. The elastic moduli for glass obtained from wave velocities by acoustic microscope agree fairly well with those by other methods. The present method is applied to aluminium alloy, and it is shown that this method is useful in measuring the microscopic characteristics in inhomogeneous materials. |
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| Keywords: | elastic modulus acoustic microscope reflectance function |
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