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Basic techniques for ultrasonic measurements are discussed with emphasis placed on accuracy of sound velocity. Recent ultrasonic studies under high pressure are briefly reviewed, and a new analytical methodology called the complete thermodynamic equation of state is introduced. The potential of the method is demonstrated by analyzing a synthetic model data set. The results suggest that the method can be used to constrain thermodynamic parameters, such as heat capacity and thermal expansivity, up to pressures of the core-mantle boundary using experimental data collected only up to 10 Gpa. [high pressure, high temperature, acoustics, elasticity, ultrasonic, complete thermodynamic equation of state, pressure scale, GHz interferometry]

kōatsuryoku no kagaku to gijutsu/kouatsuryoku no kagakuto gijutsu

High Pressure Earth Science. Recent Studies on Ultrasonic Measurements under High Pressure and a New Analytical Methodology for Ultrasonic Velocity Data at Simultaneous High Pressure and High Temperature.