华中科技大学学报（自然科学版）2011，Vol.39Issue(6)：91-95,5.
有限厚铁磁性试件脉冲涡流响应研究
Pulsed eddy current response to a ferromagnetic specimen with finite thickness
摘要
Abstract
Method for the pulsed eddy current (PEC) response to a specimen based on direct analysis of transient eddy currents and induced magnetic fields was presented. Based on the experimental verification, the PEC response to a ferromagnetic specimen of finite thickness was computed with numerical simulation method. The law of eddy current diffusion in specimen was studied, and thus the PEC response was divided into two stages. The relation between the response and resistivity or permeability of the specimen was obtained by fitting the response curves of different resistivity or permeability models at the same time points, and the relation between the response and time was obtained by fitting the response curves with time. The results show that early PEC response decays with 0. 5 powers to the resistivity, 0. 5 powers to the permeability, and 1. 5 powers to the time. The latter response decays with negative exponent to time, and the exponential decay coefficient is proportional to the resistivity but inversely proportional to the permeability.关键词
无损检测/脉冲涡流/涡流扩散/铁磁性试件/数值模拟/曲线拟合Key words
nondestructive testing/ pulsed eddy current/ eddy current diffusion/ ferromagnetic specimen/ numerical simulation/ curve fitting分类
矿业与冶金引用本文复制引用
徐志远,武新军,黄琛,康宜华..有限厚铁磁性试件脉冲涡流响应研究[J].华中科技大学学报（自然科学版）,2011,39(6):91-95,5.基金项目
国家自然科学基金资助项目(51077059) （51077059）
国家科技支撑计划资助项目(2006BAK02B02). （2006BAK02B02）
