| A Novel Approach to Correct Diffraction Effect in Measurment of ultrasonic Velocity and Attenuation at High Frequencies |
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| 作者姓名： | 章东 刘晓宙 龚秀芬 KUSHIBIKIJun-Ichi |
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| 作者单位： | [1]StatekeyLaboratoryofModernAcoustics,instituteofAcoustics,NanjingUniversity,Nanjing210093 [2]DepartmentofElectricalEngineering,Tohokuuniversity,Sendai980-8579,Japan |
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| 摘 要： | A novel method to correct diffraction effect in measurement of ultrasonic velocity and attenuation at high frequencies is developed by using the superposition technique of Gaussian beams.To examine the validity of this numerical approach,the amplitude loss and phase advance due to the diffraction effect for an SiO2 specimen are numerically calculated in 30-240MHz,and the results are in good agreement with those by the Papadakis method.
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| 关 键 词： | 超声速率 测量方法 高频条件 正衍射效应 超声衰减 数值逼近法 振幅 相位 |
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