涡流检测的数值模拟与缺陷定量分析

Numerical Simulation in Eddy Current Testing and Defect Quantitative Analysis

将数值模拟与信号分析技术用于涡流检测缺陷的定量分析中。针对差动线圈,检测管子上不同埋藏深度缺陷的模型进行数值计算,得到对应的阻抗平面图。为了识别不同阻抗平面图所对应的缺陷,利用傅立叶变换方法进行了特征量提取,得到了不同的描述符;设计人工神经网络对不同的特征量进行分析识别,变换的傅立叶描述符可用作缺陷定量的有效特征量。

Numerical simulation and signal processing techniques are used for defects quantification in eddy current testing. The impedance diagrams using differential coils to test the tube with different defects are numerically calculated. To size the defects, several characteristic signals are extracted using Fourier transform method. Signals are, analyzed by programming with artificial neural network, the modified Fourier descriptors gives more accurate result.