Effect of diffraction on the ultrasonic velocity measuredby the pulse interference method in VHF range

1 IntroduCtionIt has been demonstrated that, the frequenCy dependences of ultraSOnic velocity and at-tenuatiOn in VHF range are very useful in the ultrasenic characterizations of silicate glasses,especmp the siedcant vefocity djspersions dsited in tfor frequncy rang and the power despendences of freqUeny of attenuation coefficients can be erpected to be used as the alternativeacoustic paramters in the ultrasonic characterizations of materiaIs[1].In order to accurately measure the frequellc…