Investigations of Different Type of Glass by Ultrasonic Interferometer Technique at Room Temperature and High Pressure

The ultrasonic interferometer techniques－phase comparison method, pulse echo overlap, pulse superposition and phase detection have been combined together to study the elastic properties of three types of glass under different pressures and room temperature. These glasses are named by silicate glass (water white glass and window glass) and polystyrene. The results show that there exists a big difference in the ultrasonic velocities, attenuations and elastic constants at room temperature between silicate glass and polystyrene. At high pressure, the pressure dependences of velocities are similar for both types of silicate glass: the velocities of longitudinal waves increase as pressure increased, while the velocities of shear waves decrease linearly, and the attenuations in longitudinal waves also increase with pressure. However attenuations of shear waves for the two types of silicate glass vary oppositely with pressure, the attenuation goes up with pressure for water white glass, and goes down for window glass. The results obtained by above techniques are consistent, and is in agreement with Brillouin scattering data at corresponding pressure range.