Development of nondestructive evaluation and analysis system for complicated defects by using advanced magnetic sensors

为了建立复杂缺陷或裂纹的定量无损检测方法，采用先进的磁通门传感器测量缺陷周围的漏磁分布。建立了缺陷漏磁分布与缺陷磁偶极矩的关系式。利用Tikhonov正则化等反分析技术，可以得到磁偶极矩，并对复杂缺陷的宽度、形状和尺寸进行评估。利用先进的磁传感器测量技术和磁反分析技术，构建了复杂裂纹或缺陷的无损检测分析系统。

In order to establish quantitative nondestructive evaluation of complicated defects or cracks, magnetic flux leakage distribution around defects was measured using advanced magnetic sensor of fluxgate sensor. And the relationship between magnetic flux leakage distribution and magnetic dipole moment of defect was formulated. By using inverse analysis technique such as Tikhonov regularization, magnetic dipole moment could be obtained and the width, shape and size of complicated defects were evaluated. It was concluded that nondestructive evaluation and analysis system for complicated cracks or defects was constructed by using advanced magnetic sensor measurement and magnetic inverse analysis technique.