| 磁饱和后的涡流检测信号的非涡流效应 |
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| 引用本文： | 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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| 作者姓名： | 康宜华 宋凯 张雅伟 任吉林 |
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| 作者单位： | 康宜华,宋凯,KANG Yi-Hua,SONG Kai(华中科技大学,机械学院,武汉,430074;数字制造装备与技术国家重点实验室,武汉,430074;南昌航空大学,无损检测技术教育部重点实验室,南昌,330063);张雅伟,任吉林,ZHANG Ya-Wei,REN Ji-Lin(南昌航空大学,无损检测技术教育部重点实验室,南昌,330063)
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| 基金项目： | 国家自然科学基金，无损检测技术教育部重点实验室基金，江西省教育厅基金 |
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| 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。
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| 关 键 词： | 磁饱和 涡流检测 漏磁检测 扰动磁场 |
The Eddy Current Signal Under Magnetic Saturation Condition Signal not Induced by Eddy Current Effect |
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| 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. |
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| Authors: | KANG Yi-Hua SONG Kai ZHANG Ya-Wei REN Ji-Lin |
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| Affiliation: | KANG Yi-Hua , SONG Kai , ZHANG Ya-Wei , REN Ji-Lin (1. School of Mechanical Science and Engineering, H uazhong University of Science and Technology, Wuhan 430074, China; 2. State Key Lab of Digital Manufacturing Equipment ＆ Technology, Wuhan 430074, China; 3. Key Laboratory of Nondestructive Test(Ministry of Education), Nanchang hangkong university, Nanchang 330063, China) |
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| 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. |
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| Keywords: | Eddy current testing Magnetic saturation Magnetic flux leakage testing Perturbed magnetic field |
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