涡流阻抗图的傅里叶描述和分析  

FOURIER DESCRIPTION AND ANALYSIS OF EDDY CURRENT IMPEDANCE PATTERNS

作　　者：吴步宁[1] 梁玉红[1] 陈志祥[2] 

机构地区：[1]湖北汽车工业学院电气工程系,湖北十堰442002 [2]华中科技大学机械科学与工程学院,武汉430074

出　　处：《无损检测》2001年第9期369-371,共3页Nondestructive Testing

摘　　要：提出了一种基于涡流图形的水平和垂直分量信号的二维傅里叶描述和分析的方法。该描述可作为涡流图形的一种近似的参数模型。并证明涡流图形可容易地通过傅里叶级数的两个复系数获得重构 ,在重构时低频和高频噪声被滤除。A method of characterizing the eddy current (EC) patterns based on two dimensional Fourier description of in phase and quadrature signals is presented. The description can be considered as an approximation of the EC pattern by a parametric model. It is shown that the EC patterns can be easily reconstructed from the two complex terms in the Fourier expansion and both low and high frequency noises can be efficiently filtered out during the reconstruction.

关 键 词：傅里叶变换 涡流检验 阻抗图形 涡流图形 傅立叶级数 

分 类 号：TG115.28[金属学及工艺—物理冶金] O174.22[金属学及工艺—金属学]