摘要
介绍了磁光/涡流成像检测系统的基本工作原理及组成,给出了初步的实验结果,并对试验结果进行了相应的图像处理,实现了对表面及亚表面细小缺陷的可视化无损检测,克服了传统的涡流检测方法中探头尺寸相对较小而检测面积大,检测工作要消耗大量时间且不易操作的缺点,并具有探测结果可视化且直观易懂;易于保存;检测难度低;检测前不需要清除油漆等表面覆盖层,只需要保证待检测表面具有较好的反射性能;可对亚表面以及表面缺陷进行实时成像检测等优点。试验结果进一步验证了系统的正确性和重要性。
A magneto-optic/eddy current imaging system is used to test the defects at the surface or the subsurface of the metal＇ samples in this paper. Excited by alternating current signals, alternating current magneto field is made from the excitation coil, transient eddy current is induced at the surface and subsurface of the metal sample, and the eddy current magnetic field can influence the induced magnetic field of the excitation coil. If there are some defects in the sample, they will vary the distribution of eddy current field, and then change the whole magnetic field. The polarization of the light will have a deflection angle when the light penetrates the optical rotation crystal film. Meantime, a magnetic-optic sensor placed parallelly to the sample surface can convert this change into optical intensity change. Finally the optical intensity change is received with CCD to realize visual nondestructive testing. The experimental results show that the system is feasible and appropriate.
出处
《光学精密工程》
EI
CAS
CSCD
北大核心
2006年第5期797-801,共5页
Optics and Precision Engineering
基金
四川省应用基础研究项目资助(No.02GY029-022)
关键词
磁光效应
涡流
可视化
CCD
成像系统
magneto-optic effect
eddy current
visualization
CCD
imaging system
