空军工程大学学报（自然科学版）2016，Vol.17Issue(3)：33-39,7.DOI:10.3969/j.issn.1009-3516.2016.03.007
脉冲远场涡流检测中磁场抑制技术
Research on Magnetic Field Suppression Technique in Detecting Pulsed Remote Filed Eddy Current
摘要
Abstract
Aimed at the problems that the signals of traditional remote field eddy current are weak,and the detection sensitivity is low,and how to realize the suppression of the magnetic field in the remote field ed-dy current is a key problem to improve the detection ability,this paper designs some sensors with different shield structure from the perspective of restraining direct coupling component of magnetic field,analyzes the effect of shield with different materials,and compares the defects,detection sensitivity and the capa-bility of detecting large thick flat geometry.The results show that the sensor with the connected magnetic circuit based on high magnetic shield has a good ability in restraining as for the direct coupling component, and can shorten transient length,can narrow the distances between the excitation and the detection coil, and can improve the sensitivity in detecting defects.And its detection depth can be extended to 25mm as for nonmagnetic plate.关键词
脉冲远场涡流/直接耦合分量/屏蔽结构/磁场抑制Key words
pulsed remote field eddy current/direct coupling component/shield structure/magnetic field suppression分类
矿业与冶金引用本文复制引用
胥俊敏,王晓锋,杨宾峰,张辉,方司阳..脉冲远场涡流检测中磁场抑制技术[J].空军工程大学学报（自然科学版）,2016,17(3):33-39,7.基金项目
国家自然科学基金(51377172) （51377172）
陕西省自然科学基础研究计划(2015JM5147) （2015JM5147）
