High Accuracy Tiny Crack Detection in Metal by Low Frequency Electromagnetic Technique

5th International Conference on Advances in Optoelectronics and Micro/Nano-optics

Lou, Weimin^1 ; Shen, Changyu^1 ; Shentu, Fengying^1 ; Li, Guanghai^2 ; Chang, Yu^2 ; Lu, Xinyuan^2

Institute of Optoelectronic Technology, China Jiliang University, Hangzhou, China^1

China Special Equipment Inspection and Research Institute, Beijing, China^2

关键词: Crack measurement;    Detecting defects;    Eddy current techniques;    Electromagnetic techniques;    Lift-off effect;    Low frequency testing;    Low-frequency;    Two-dimension;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/680/1/012017/pdf
DOI  :  10.1088/1742-6596/680/1/012017

来源: IOP

【 摘 要 】

A low frequency testing technology based on eddy current technique is proposed for detecting defects in some special equipment surface. A two-dimension model is built to simulate the distribution of low frequency (10 Hz) magnetic flux density nearby the surface of a metal plate. The influence of lift-off effect, coil diameter, crack shape on the measurement are discussed. And the crack measurement sensitivity of 0.6 pm was obtained.