基于GMR阵列的多层铝板缺陷检测系统
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摘要
针对多层铝板缺陷的自动化和定量化检测问题,基于直流通电测磁原理研制一套阵列GMR(巨磁阻)缺陷检测系统。系统包括激励模块、检测模块和软件平台等3个模块,设计包含8个GMR阵元的阵列微磁检测探头,并根据直流通电测磁的缺陷信号特征,采用横向磁场分量信号Bx对缺陷进行表征和定量评价。以多层铝板为对象进行系统灵敏度测试和缺陷检测。实验结果表明,基于GMR阵列的直流通电测磁缺陷检测系统具有较高的灵敏度,能够有效地检测多层铝板中的缺陷并对缺陷长度进行量化评价。
To deal with the problems of automatic and quantitative detection of defects in multilayer aluminum plate,an array of Giant Magnetoresistive(GMR)defect detection system was developed based on the principle of DC current measurement.The transverse magnetic field component signal(Bx)is firstly selected to characterize and quantitatively evaluate the defect,according to the characteristics of the defect signal of DC power measurement.Then the array micromagnetic detection probe containing 8 GMR array elements is designed to build up an electromagnetic nondestructive detection system.Finally,the system sensitivity test and defect detection experiment were carried out on a multi-layer aluminum plate.The results show that the DC-based magnetic field detection system based on GMR array has higher sensitivity and can better detect and quantify defects in the multilayer aluminum plate.
To deal with the problems of automatic and quantitative detection of defects in multilayer aluminum plate,an array of Giant Magnetoresistive(GMR)defect detection system was developed based on the principle of DC current measurement.The transverse magnetic field component signal(Bx)is firstly selected to characterize and quantitatively evaluate the defect,according to the characteristics of the defect signal of DC power measurement.Then the array micromagnetic detection probe containing 8 GMR array elements is designed to build up an electromagnetic nondestructive detection system.Finally,the system sensitivity test and defect detection experiment were carried out on a multi-layer aluminum plate.The results show that the DC-based magnetic field detection system based on GMR array has higher sensitivity and can better detect and quantify defects in the multilayer aluminum plate.
引文
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[2]范孟豹.多层导电结构电涡流检测的解析建模研究[D].杭州:浙江大学,2009.
[3]叶波.多层导电结构深层缺陷电涡流检测和定量化评估研究[D].杭州:浙江大学,2009.
[4]李明轩.粘接质量超声检测研究[J].应用声学,2002,21(1):7-12.
[5]徐可北,周俊华.涡流检测[M].北京:机械工业出版社,2004.
[6]Tian Guiyun,Ali Sophian.Reduction of lift-off effects for pulsed eddy current NDT[J].NDT&E International,2005,38(4):319-324.
[7]Yang Binfeng,Li Bin,Wang Yunjiang.Reduction of liftoff effect for pulsed eddy current NDT based on sensor design and requency spectrum analysis[J].Nondestructive Testing and Evaluation,2010,25(1):77-89.
[8]康宜华,谈存真,宋凯,等.铝板和铜板裂纹磁场检测法[J].无损检测,2011,33(5):15-18.
[10]Li DongLin,Kang Yihua,Sun Yanhua,et al.Nondestruct-ive evaluation of conducting materials using a directcurrent perturbation method[J].Studies in Applied Electromagnetics and Mechanics,2015,40:273-280.
[11]张继楷,康宜华,李冬林,等.有色金属通电测磁探伤方法可行性研究[J].传感器与微系统,2016,35(8):47-50.
[12]李冬林.基于直流通电测磁的有色金属电磁无损检测方法研究[D].武汉:华中科技大学,2016.
[13]吴衍运,李伟,葛久浩,等.基于ACFM技术阵列TMR探头及裂纹检测系统开发[J].无损检测,2016,38(10):29-33.