涡流
磁导率
电导率
材料科学
电阻率和电导率
无损检测
核磁共振
磁场
涡流检测
有限元法
物理
电气工程
热力学
化学
工程类
量子力学
生物化学
膜
作者
Yating Yu,Yu Zou,Mohamed Al Hosani,Guohui Tian
标识
DOI:10.1109/tmag.2016.2616328
摘要
Both the electrical conductivity and the magnetic permeability of a measured sample have significant impact on the detected signal in eddy current nondestructive testing. Therefore, the problem of obtaining accurate measurement for the electrical conductivity or magnetic permeability has been of great interest to design and manufacturing engineers. In this paper, the conductivity invariance phenomenon (CIP) is investigated and utilized to detect the magnetic permeability of metals. First, the CIP is introduced and its sensitivity factors are investigated using a finite-element method. An experimental platform is set up based on which the CIP is verified. Finally, a magnetic permeability measurement device is proposed, which separates the coupling impact of the sample's electrical conductivity and magnetic permeability. The work reported in this paper provides an effective approach to accurately estimate the magnetic permeability of metals without the influence of its conductivity.
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