Measurement of Ultrasonic Attenuation in Solid under Hydrostatic Pressure

A problem in measuring sound attenuation in a solid in hydraulic fluid has been treated on a theoretical and an experimental basis. When an ultrasonic pulse reflection method is used for the measurement, an apparent attenuation due to the sound transmission from the ends of the solid specimen into the fluid is fairly large and strongly dependent on applied pressure. The attenuation was represented as a function of pressure, and calculated results were compared with experiments. Attenuation measurements were made at 30–90 MHz sound frequencies on a LiF crystal under pressure up to 3000 kg/cm 2 . Agreement between the calculated and experimental pressure dependences was satisfactory.