A Novel Approach to Correct Diffraction Effect in Measurment of ultrasonic Velocity and Attenuation at High Frequencies

(整期优先)网络出版时间:2003-07-17
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AnovelmethodtocorrectdiffractioneffectinmeasurementofultrasonicvelocityandattenuationathighfrequenciesisdevelopedbyusingthesuperpositiontechniqueofGaussianbeams.Toexaminethevalidityofthisnumericalapproach,theamplitudelossandphaseadvanceduetothediffractioneffectforanSiO2specimenarenumericallycalculatedin30-240MHz,andtheresultsareingoodagreementwiththosebythePapadakismethod.