Measurement of shear wave attenuation coefficient using a contact pulse-echo method with consideration of partial reflection effects
Measurement of shear wave attenuation coefficient using a contact pulse-echo method with consideration of partial reflection effects
复制标题
考虑部分反射效应的接触脉冲回波法测量横波衰减系数
DOI：
10.1088/1361-6501/ab2a5e
复制
发表时间：
2019-11-01
影响因子：
2.4
通讯作者：
Zhang, Shuzeng
中科院分区：
文献类型：
--
作者：
Zhang, Guangdong;Liu, Xiling;Zhang, Shuzeng
超声剪切波衰减系数的准确测量对于材料微观结构的定量无损评价至关重要。这项工作提供了一个实验技术，使用接触法测量该系数。测量第一和第二脉冲回波剪切波信号，并用于计算频率相关的衰减系数，在此过程中，衍射和衍射影响的部分反射系数进行校正，以提高测量精度。衍射系数由剪切波速度的测量值计算，部分反射系数通过在相对侧使用另一个换能器并考虑波浪衍射效应来实验确定。剪切波衰减系数的确定为不同厚度的样品，这些结果显示出良好的协议在宽带频率，从而验证了所提出的方法。论证了利用剪切波衰减判别增材制造材料孔隙率的优势，并讨论了利用该方法精确测量剪切波衰减系数的实际效益。
Accurate measurements of the ultrasonic shear wave attenuation coefficient are essential for the quantitative nondestructive evaluation of the microstructure of a material. This work provides an experimental technique for measuring this coefficient using a contact method. The first and second pulse-echo shear wave signals are measured and are used to calculate the frequency-dependent attenuation coefficient; in this process, the diffraction and the diffraction-affected partial reflection coefficient are corrected to improve the accuracy of measurement. The diffraction coefficient is calculated from measurements of the shear wave velocity, and the partial reflection coefficient is determined experimentally by using another transducer on the opposite side and taking into account wave diffraction effects. The shear wave attenuation coefficient is determined for samples of different thicknesses, and these results show good agreement over a broadband frequency, thus validating the proposed method. The advantage of discriminating the porosity of additive manufacturing materials using shear wave attenuation is demonstrated, and the practical benefits of accurately measuring the shear wave attenuation coefficient using the proposed method are also discussed.