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Quantitative evaluation of scale-parameter on material properties by an ultrasonic micro-spectrometer with a high apatial resolution

高空间分辨率超声微型光谱仪定量评价材料性能尺度参数

基本信息

批准号：
05555175
负责人：
IHARA Ikuo
金额：
$ 3.52万
依托单位：
Nagaoka University of Technology
依托单位国家：
日本
项目类别：
Grant-in-Aid for Developmental Scientific Research (B)
财政年份：
1993
资助国家：
日本
起止时间：
1993 至 1994
项目状态：
已结题

项目摘要

An ultrasonic micro-spectrometer (UMSM) with a high spatial resolution was developed in order to evaluate scale-parameters which are related to material properties. The UMSM developed here is expected to be useful for the materials characterization by ultrasonic spectroscopy at a small area on the materials surface. The results obtained in this work are summarized as follows :1) The UMSM enables us to measure precisely the reflection coefficients of materials at a small area in the frequency range from 10 to 150 Mhz ; (2) Using the measured reflection coefficients we can precisely determined phase velocities and attenuation factors of acoustic surface waves which are closely related to mechanical and electrical properties of materials. Elastic properties and grain size of materials are quantitatively estimated from the surface wave velocities and the attenuations, respectively, and also anisotropy can be detected from the reflection coefficients ; (3) An inversion technique based on th … More e ultrasonic reflectivity measurement was proposed for quantitatively estimating elastic properties of caoting films on substrate. This inversion enables us to determined materials properties of the thin film composite with randomly dispersed inclusions ; (4) Mean reflection coefficients on liquid-polycrystals interface are newly proposed for quantitatively estimating mean properties of inhomogeneous materials, and are examined experimentally and numerically. It was confirmed that the mean reflection coefficient defined here should be available as a useful parameter for estimating the local average properties in inhomogeneous materials as well as polycrystalline materials. The scale parameter on elastic properties of materials may also be estimate effectively by the mean reflection coefficient.Because the spatial resolution and frequency characteristic in the reflectivity measurements can easily be improved by reconstructing the UMSM,efficient measurements for estimating the scale parameter will be performed in near future. Less

为了评估与材料特性相关的尺度参数，开发了具有高空间分辨率的超声波微型光谱仪（UMSM）。这里开发的 UMSM 预计可用于通过超声波光谱在材料表面的小区域进行材料表征。这项工作获得的结果总结如下：1）UMSM使我们能够在10至150 Mhz的频率范围内精确测量小面积材料的反射系数； (2)利用测量的反射系数可以精确确定与材料的力学和电学性能密切相关的声表面波的相速度和衰减因子。分别根据表面波速度和衰减定量估计材料的弹性性能和晶粒尺寸，还可以根据反射系数检测各向异性； (3) 提出了一种基于超声反射率测量的反演技术，用于定量评估基材上涂层膜的弹性性能。这种反演使我们能够确定具有随机分散的夹杂物的薄膜复合材料的材料特性； (4)新提出了液体-多晶界面上的平均反射系数，用于定量估计非均匀材料的平均特性，并进行了实验和数值检验。已证实，此处定义的平均反射系数应可用作估计非均质材料以及多晶材料的局部平均特性的有用参数。通过平均反射系数也可以有效地估计材料弹性特性的尺度参数。由于通过重构UMSM可以很容易地提高反射率测量中的空间分辨率和频率特性，因此在不久的将来将进行估计尺度参数的有效测量。较少的