Determination of size and shape of small inclusions from sound-field information
Determination of size and shape of small inclusions from sound-field information
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根据声场信息确定小夹杂物的尺寸和形状
DOI：
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发表时间：
2011
期刊：
影响因子：
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通讯作者：
S. Kummritz
中科院分区：
文献类型：
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作者：
N. Gust;E. Kuehnicke;M. Wolf;S. Kummritz
扫描超声系统的分辨率受限于所使用的波长和焦点尺寸。确定接近或甚至小于波长的物体尺寸的常用方法需要了解物体的几何形状并仅使用绝对振幅信息。我们提出了新的方法来确定形状和大小的小物体通过附加的声场效应的评价，如反射波的指向性。首先，测量结果表明，通过考虑不同反射模式的最大振幅位置的几何因素，可以确定比声场尺寸小的物体的大小和形状。对于小至1/5波长的球，可以找到与位移相关的时间变化的实用可用的相对评价标准。
The resolution of scanning ultrasonic systems is limited to the wavelength used and the focus size. Common methods for determination of object sizes close to or even smaller than wavelength require knowledge of the object geometry and use absolute amplitude information only. We present new approaches for determining shape and size of small objects by additional evaluation of sound field effects like the directivity of reflected waves. First measurements show that determining size and shape of objects smaller than the size of the sound field is possible with geometric considerations on maximum amplitude positions of different reflection modes. Practical usable relative evaluation criteria for time changes in dependence of displacement can be found for ball sizes down to 1/5 wavelength.