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1. 发明授权

US5748003A Microwaves used for determining fatigue and surface crack features on metal surfaces 失效
标题翻译：微波用于确定金属表面的疲劳和表面裂纹特征
公开(公告)号：US5748003A
公开(公告)日：1998-05-05
申请号：US645761
申请日：1996-05-14
申请人： Reza Zoughi , Chin-Yung Yeh , Stoyan I. Ganchev , Christian Huber
发明人： Reza Zoughi , Chin-Yung Yeh , Stoyan I. Ganchev , Christian Huber
IPC分类号： G01B15/00 , G01N22/00 , G01N22/02 , G01R27/04
CPC分类号： G01B15/00 , G01N22/00 , G01N22/02
摘要： A method and apparatus for determining fatigue/surface crack features on metal surfaces is disclosed wherein the cracks may be empty, filled, or covered with a dielectric (e.g., paint). The present invention includes a microwave waveguide having an aperture for scanning over a surface and thereby characterizing changes in a standing wave within the waveguide when a crack is scanned. In particular, crack related data resulting from standing wave perturbations can be analyzed for determining crack geometric features such as crack width, crack depth, crack length and crack tips. These features are determinable with high precision in comparison to the size of the aperture. When locating and/or sizing the geometric features of a crack, voltage changes induced by higher order modes generated by various orientations of the crack in relation to the aperture are utilized for generating the crack related data. Further, estimates are provided as to the accuracy of a location and/or size estimate for the crack geometric features. The present invention is particularly useful for repair of steel bridges, plains, turbines and other metallic structures subject to surface fatigue cracks.
摘要翻译：公开了一种用于确定金属表面上的疲劳/表面裂纹特征的方法和装置，其中裂纹可以是空的，填充的或被电介质（例如涂料）覆盖。本发明包括具有用于在表面上扫描的孔的微波波导，从而表征当扫描裂纹时波导内的驻波的变化。特别地，可以分析由驻波扰动产生的裂纹相关数据，以确定裂纹几何特征，如裂纹宽度，裂纹深度，裂纹长度和裂纹尖端。与孔的尺寸相比，这些特征可以高精度地确定。当定位和/或调整裂纹的几何特征时，利用由裂纹相对于孔径的各种取向产生的高阶模态引起的电压变化来产生裂纹相关数据。此外，关于裂纹几何特征的位置和/或尺寸估计的准确性提供了估计。本发明特别适用于钢桥，平原，涡轮机和遭受表面疲劳裂纹的其它金属结构的修理。

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