磁饱和后的涡流检测信号的非涡流效应
The Eddy Current Signal Under Magnetic Saturation Condition Signal not Induced by Eddy Current Effect
摘 要
系统地进行了实验规划和验证, 最后应用等效源法对实验结果进行了分析。分析表明, 钢管在磁饱和状态下的涡流检测信号并不是由涡流效应产生的, 而是由漏磁场引起的。缺陷的漏磁信号可视为一等效电流源, 产生的扰动磁场被调制在高频载波上而引起涡流仪的信号显示。
涡流检测
漏磁检测
扰动磁场
Eddy current testing
Magnetic saturation
Magnetic flux leakage testing
Perturbed magnetic field
Abstract
The cause of eddy current signal under magnetic saturation condition was studied in this paper. The experimental results showed that the eddy current signal was not induced by the eddy current effect in steel pipe, but magnetic flux leakage caused by the defect. Systematic experiments were developed to confirm this conclusion. Finally, this phenomenon was explained with equivalent source method. Theoretical analysis showed that magnetic flux leakage of defect in steel pipe could be regarded as an equivalent current source. Perturbed magnetic field that was modulated in high-frequency signal could cause signal display of eddy current instrument.
中图分类号 TG115.28
所属栏目 科研成果与学术交流
基金项目 国家自然科学基金资助项目(50675083); 无损检测技术教育部重点实验室基金资助项目(ZD200629009); 江西省教育厅基金资助项目(赣教技字[2006]172 号)
收稿日期 2008/4/14
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备注康宜华(1965-), 男, 教授, 主要从事无损检测技术及仪器方面的研究工作。
引用该论文: KANG Yi-Hua,SONG Kai,ZHANG Ya-Wei,REN Ji-Lin. The Eddy Current Signal Under Magnetic Saturation Condition Signal not Induced by Eddy Current Effect[J]. Nondestructive Testing, 2009, 31(4): 257～260
康宜华,宋凯,张雅伟,任吉林. 磁饱和后的涡流检测信号的非涡流效应[J]. 无损检测, 2009, 31(4): 257～260
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参考文献
【1】康宜华, 武新军.数字化磁性无损检测[M].北京: 机械工业出版社,2006.
【2】Etcheverry J, Nicolini A, Pignotti A, et al. Shape enhancement of magnetic flux leakage signals: Industrial implementation[J]. Materials Evaluation,2004,62(8): 867-870.
【3】陈德智, 赵玉清,盛剑霓, 等.基于场量分析的涡流无损检测技术[J].无损检测,1999,21(6): 241-244.
【4】GB/T 7735—2004 钢管涡流探伤检验方法[S].
【5】JIS G 0583—2004 Eddy current examination of steel pipes and tubes[S].
【6】李富成.钢管涡流探伤设备的技术改造[J].无损检测,2006,28(2): 84-85.
【7】段耀勇,陈荣华,盛剑霓, 等.涡流检测中的微扰模型[J].无损检测,1997,14(4-5): 693-695.
【2】Etcheverry J, Nicolini A, Pignotti A, et al. Shape enhancement of magnetic flux leakage signals: Industrial implementation[J]. Materials Evaluation,2004,62(8): 867-870.
【3】陈德智, 赵玉清,盛剑霓, 等.基于场量分析的涡流无损检测技术[J].无损检测,1999,21(6): 241-244.
【4】GB/T 7735—2004 钢管涡流探伤检验方法[S].
【5】JIS G 0583—2004 Eddy current examination of steel pipes and tubes[S].
【6】李富成.钢管涡流探伤设备的技术改造[J].无损检测,2006,28(2): 84-85.
【7】段耀勇,陈荣华,盛剑霓, 等.涡流检测中的微扰模型[J].无损检测,1997,14(4-5): 693-695.
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