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首页> 外文期刊>IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control >Quantitative imaging of Rayleigh wave velocity with a scanning acoustic microscope
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Quantitative imaging of Rayleigh wave velocity with a scanning acoustic microscope

机译：扫描声显微镜对瑞利波速度的定量成像

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摘要

An acoustic microscope operating with impulse excitation has been used to perform measurements of the Rayleigh wave velocity by measuring the time difference between the direct reflected signal and the Rayleigh wave signal. The accuracy and precision of the methodology have been examined by performing measurements at a single location on an elastically isotropic sample of E6 glass. The accuracy of the Rayleigh wave velocity measurement has been determined to be better than 0.5%. The measured Rayleigh wave velocity of (3035/spl plusmn/5) m/s differs by 0.3% from measurements reported in the literature for a similar sample, using two different techniques. The methodology has been extended to acquire the Rayleigh wave velocity while raster scanning the sample to develop a quantitative velocity image. The background noise in the Rayleigh wave velocity image has been investigated by mapping the velocity on elastically isotropic E6 glass. Possible reasons for background noise in the images is discussed. The methodology has been extended to acquire quantitative Rayleigh wave velocity images on Ti-6Al-4V. The contrast in the images is attributed to the variation of the Rayleigh wave velocity in individual grains or regions. Applicability of the technique to investigate crystallographic texture in materials is discussed.
机译：通过测量直接反射信号与瑞利波信号之间的时间差，已将使用脉冲激励的声学显微镜用于瑞利波速度的测量。通过在E6玻璃的各向同性弹性样品上的单个位置进行测量，已经检验了该方法的准确性和精确性。瑞利波速度测量的精度已确定为优于0.5％。使用两种不同的技术，测量的（3035 / spl plusmn / 5）m / s的瑞利波速度与文献中报道的类似样品的测量值相差0.3％。该方法已扩展为在光栅扫描样品以形成定量速度图像的同时获取瑞利波速度。通过在弹性各向同性E6玻璃上绘制速度，研究了瑞利波速度图像中的背景噪声。讨论了图像中背景噪声的可能原因。该方法已扩展为获取Ti-6Al-4V上的定量瑞利波速度图像。图像中的对比度归因于各个颗粒或区域中瑞利波速度的变化。讨论了该技术在材料中研究晶体织构的适用性。

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