基于隧道磁电阻传感器的脉冲涡流无损检测

Non-destructive Testing of Pulse Eddy Current Based on Magnetic Sensor

目前航空工业多采用铝合金部件,由于航空工业的量轻化等需求导致对铝合金件强度保持有较高的要求,因此对结构材料缺陷的检测尤为重要;为此文章设计了一种基于隧道磁电阻(Tunnel magnetoresistance,TMR)传感器的脉冲涡流无损检测系统方案,对铝合金缺陷参数与被测信号波形的关系进行了研究;首先使用有限元仿真软件COMSOL建模并获取仿真实验数据,证明了脉冲涡流无损检测应用于铝合金材料的可行性;其次,应用仿真结果指导探头设计,进而设计出检测系统,采取实物实验结果与仿真建模分析结果进行对比的方法,实验验证了检测系统的准确性、可靠性和在工程应用中的可行性;最后分析和讨论了缺陷宽度和缺陷深度的无损检测结果;为TMR传感器工程应用确立了实验基础。

The aerospace industry adopts aluminum alloy parts.Due to the demand for lightweight and other requirements in the aerospace industry,there is a high requirement for maintaining the strength of aluminum alloy parts.Therefore,the detection of structural material defects is particularly important.In this paper,a pulsed eddy current non-destructive testing(NDT)system based on tunnel magnetoresistance(TMR)sensor is designed.The relationship between aluminum alloy defect parameters and measured signal waveforms is studied.For the first time,finite element simulation software COMSOL was used to model and obtain simulation experimental data,which proved the feasibility of pulsed eddy current nondestructive testing in aluminum alloy materials.Secondly,the simulation results were used to guide the probe design,and designing a detection system,using the method of comparing the physical experiments results and simulation modeling analysis results.The experiment verifies the accuracy,reliability and feasibility of this detection system.Finally analyzed and discussed the non-destructive test results of defect width and defect depth.Established experimental basis for TMR sensor engineering application.