公开(公告)号：US5182513A

公开(公告)日：1993-01-26

申请号：US696456

申请日：1991-04-06

申请人： John D. Young ,  Kristina H. Hedengren ,  Donna C. Hurley

发明人： John D. Young ,  Kristina H. Hedengren ,  Donna C. Hurley

IPC分类号： G01N27/90 ,  G01R27/00

CPC分类号： G01R27/00 ,  G01N27/904 ,  G01N27/9046

摘要： The invention discloses an inspection system for detecting near surface flaws or defects in conductors using nondestructive eddy current testing suitable for industrial application. The system provides a method and apparatus for acquiring real time, synchronized, discrete eddy current measurement signals from a plurality of sufficiently disposed, spatially correlated eddy current probes then processing and formatting said measurement signals automatically over parallel data channels to accommodate digital processing techniques in order to produce on eddy current image. Utilizing digital image processing provides a capability for improving flaw detection limits while simultaneously enhancing image resolution.

摘要翻译： 本发明公开了一种用于检测适用于工业应用的非破坏性涡流测试的接近表面缺陷或导体缺陷的检测系统。 该系统提供了一种用于从多个充分放置的空间相关涡流探针获取实时，同步，离散的涡流测量信号的方法和装置，然后在并行数据通道上自动处理和格式化所述测量信号，从而按顺序适应数字处理技术 以涡流形象产生。 利用数字图像处理提供了改善探伤极限同时增强图像分辨率的能力。

公开(公告)号：US4920491A

公开(公告)日：1990-04-24

申请号：US194235

申请日：1988-05-16

申请人： Jeffrey W. Eberhard ,  Kristina H. Hedengren

发明人： Jeffrey W. Eberhard ,  Kristina H. Hedengren

IPC分类号： A61B6/03 ,  A61B8/00 ,  G01N23/04 ,  G06T1/00 ,  G06T11/00 ,  G06T15/08

CPC分类号： G06T11/006 ,  G01N23/046 ,  G01N2223/419 ,  Y10S378/901

摘要： The quality of incomplete data Non-Destructive Evaluation and Computed Tomography images is improved by incorporating a priori information into the image reconstruction and image processing to supplement the available data. The a priori information is provided by electronic models of the part derived from a solid modeler, physics of the inspection process, and outputs of touch and other sensors. Methods of improving limited-angle X-ray CT images are given. Calculated projection data in the missing angular range is provided by calculating x-ray path lengths through a solid model of the part, and x-ray attenuation from known physical parameters of the part and source. The measured and calculated projection data are combined to reconstruct the CT image. In an iterative reconstruction approach, precise boundary information from a model and calculated attenuation are information to improve the limited angle image.

摘要翻译： 不完整数据的质量通过将先验信息并入到图像重建和图像处理中以补充可用数据来改进非破坏性评估和计算机断层摄影图像。 先验信息由源自实体建模器的部件的电子模型，检查过程的物理学以及触摸和其它传感器的输出提供。 给出了改善有限角度X射线CT图像的方法。 通过计算通过部件的实体模型的x射线路径长度和从部件和源的已知物理参数得到的x射线衰减来提供缺失角度范围内的计算投影数据。 将测量和计算的投影数据组合以重建CT图像。 在迭代重建方法中，来自模型和计算衰减的精确边界信息是改善有限角度图像的信息。