The Extraction of Characteristic Quantity of Pulsed Magnetic Flux Leakage Signal of Shallow Defects
摘 要
为提高脉冲漏磁对浅薄缺陷的检测能力,提出了一种处理检测信号的二次差分方法,分离出在涡流效应的阻尼作用下产生的脉冲漏磁信号中的涡流分量,即二次差分信号。从二次差分信号中提取出了浅薄缺陷深度的新特征量——峰值时间Pt,并验证了二次差分方法的可行性。试验结果表明,和信号幅值大小相比,将Pt作为浅薄缺陷特征量,在检测浅薄缺陷时对缺陷深度的分辨率较高,同时能够克服检测探头提离所引起的缺陷特征量分辨率严重下降的问题。
Abstract
In order to enhance the testing ability of pulsed magnetic flux leakage(PMFL) for shallow defects, the method of second difference for dealing with testing signals was put forward, which separated the eddy current components, namely second differential signals, caused by the damping of eddy current effect from the signals in pulsed magnetic flux leakage. From second differential signals, a new characteristic quantity of the depth of shallow defects—peak time Pt was extracted and the feasibility of the method of second difference was verified. The experimental results showed that compared with the value of signal amplitude, the resolution of the depth of defects was higher while testing shallow defects if Pt was taken as the characteristic quantity of shallow defects and at the same time, the problem of the seriously decreasing resolution of the characteristic quantity of defects caused by the lift-off of the testing probe could be solved.
中图分类号 TG115.28
所属栏目 科研成果与学术交流
基金项目 河北省自然科学基金资助项目(E2008001258)
收稿日期 2011/4/11
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备注费骏骉(1984-),男,硕士研究生,研究方向为电磁无损检测。
引用该论文: FEI JunBiao,ZUO XianZhang,TIAN GuiYun,ZHANG Yun,ZHANG Tao. The Extraction of Characteristic Quantity of Pulsed Magnetic Flux Leakage Signal of Shallow Defects[J]. Nondestructive Testing, 2012, 34(1): 2~6
费骏骉,左宪章,田贵云,张云,张韬. 浅薄缺陷的脉冲漏磁信号特征量提取[J]. 无损检测, 2012, 34(1): 2~6
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参考文献
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【3】Sophian Ali, Tian Gui Yun, Taylor David, et al. A feature extraction technique based on principal component analysis for pulsed Eddy current NDT[J]. NDT&E International,2003,36(1):37-41.
【4】唐莺,罗飞路,潘孟春,等.脉冲漏磁检测的三维场特征分析及缺陷分类识别[J].仪器仪表学报,2009,30(12): 2506-2510.
【5】唐莺,罗飞路,潘孟春,等.脉冲漏磁检测管道技术的有限元分析[J].无损检测,2009,31(7):513-516.
【6】唐莺,潘孟春,罗飞路,等.管道腐蚀检测中的脉冲漏磁检测技术[J].计算机测量与控制,2010,18(1):38-39.
【7】王韫江,王晓锋,丁克勤.基于脉冲漏磁理论的管道腐蚀缺陷宽度定量技术[J].测试技术学报,2009,23(5):390-395.
【8】Chen Tian Lu, Tian Gui Yun, Sophian Ali, et al. Feature ext raction and selection for defect classification of pulsed eddy current NDT[J]. NDT&E International,2008,41(6):467-476.
【9】Huang Zuoying, Que Peiwen, Chen Liang. 3D FEM analysis in mengnetic flux leakage method[J]. NDT&E International,2006,39(1):61-66.
【10】Javier GarcíaMartín, Jaime GómezGil, Ernesto Vázquez Sánchez. Review nondestructive techniques based on eddy current testing[J]. Sensors,2011,11(3):2525-2565.
【11】Blitz J, Peat T S. The application of multifrequency eddy currents to testing ferromagnetic metals[J]. NDT International,1981,14(1):15-17.
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