Measurement errors of ultrasonic velocity and attenuation due to nonparallelness of specimen faces

• 来源期刊: 声学学报（英文版）
• 学科: 物理学
• 年，卷（期）: 2003,（2）
• 页码范围: 113-120
• 页数: 8页
• 分类号: O42
• 语种: 英文

摘要

The measurement errors due to nonparallelness of specimen faces in the ultrasonicvelocity and attenuation coefficient measured by the pulse reflection method in VHF range havebeen investigated theoretically, and the theoretical expressions for estimating these measure-ment errors are given. It has also been shown that, the attenuation coefficient error is dependingon both the nonparallelness angle of specimen faces and the ultrasonic frequency, but the ve-locity error is only depending on the former. Furthermore, for pure silica glass specimen it isestimated that, in VHF range in order to insure that the attenuation coefficient and velocityerrors due to nonparallelness of specimen faces are less than 10% and 0.01%, respectively, thenonparallelness angle of specimen faces must be less than 10 s and 40 s correspondingly.