摘要
基于瞬态磁场的轴对称特性,利用有限元方法建立了脉冲涡流厚度检测的理论模型。仿真分析了被测金属板材在不同电导率和厚度参数时的探头差分信号并选择探头差分信号峰值作为信号特征。经分析发现:电导率一定时,差分信号峰值随被测金属板材厚度的增加呈递增趋势;被测金属板材厚度相同时,电导率越大差分信号峰值就越大。运用建立的试验系统进行实验研究,结果表明,实验与仿真结论一致,表明了所建模型的正确性和仿真结果的可信性。
A 2D finite-element model is established for thickness measurement using pulsed eddy current（PEC）technique due to axisymmetric of transient magnetic field. The PEC differential signals were calculated using the de-veloped theoretical model for sheets with different conductivity and thickness. Through analysis on PEC signals dueto samples,the peak amplitudes are considered as the desirable signal features for thickness evaluation. The simulation results show that the peak value of the PEC differential signal increases when the sheet under test becomesthicker. The metal sheet with higher conductivity also makes the peak value of PEC differential signal larger as well.The observations from the experimental measurements agree well with those from simulation data,which validatesthe developed model and the simulated results.
出处
《传感技术学报》
CAS
CSCD
北大核心
2016年第6期821-825,共5页
Chinese Journal of Sensors and Actuators
基金
国家自然科学基金项目(5107172)
博士学科点专项科研基金项目(20120095120027)
江苏省大人才高峰项目(ZBZZ-041)
轻工过程先进控制教育部重点实验室开放课题项目(APCL11404)
关键词
无损检测
厚度检测
脉冲涡流
有限元仿真
峰值
nondestructive testing
thickness measurement
pulsed eddy current
finite element simulation
peak value
