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Evaluates acoustic properties in materials, suggesting broad applications in engineering and biology.
We developed a line-focus-beam ultrasonic material characterization (LFB-UMC) system and plane-wave (PW)-UMC system. The LFB-UMC system can measure the phase velocity and attenuation of leaky surface acoustic waves (LSAWs) propagating on a water-loaded specimen surface, and the PW-UMC system can measure those of longitudinal and shear waves propagating in solid specimens. LFB and PW ultrasonic devices were fabricated by depositing a ZnO piezoelectric thin film on the flat surface of a sapphire acoustic lens or synthetic silica buffer rod, respectively, using the DC sputtering method. We have demonstrated the usefulness of these systems by applying them to the homogeneity evaluation and determination of acoustical physical constants (elastic constant, piezoelectric constant, dielectric constant, and density) of LiNbO3, LiTaO3, and α-Quartz single crystals for SAW and optical devices, functional glass materials such as ultra-low-expansion glasses and chemically tempered glasses, and semiconductor materials such as ZnO and AlN single crystals. These systems can be applied not only to bulk materials but also to thin-film materials by measuring the frequency dependence of phase velocities and/or attenuation coefficients. The PW-UMC system can also be applied to acoustic properties (velocity, attenuation coefficient, density, and acoustic impedance) measurements of biological tissues and liquids.
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Arakawa et al. (2025) studied this question.
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