The Simulation Analysis of Pulsed Eddy Current Flaw Detection Based on Magnetic Shielding
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摘要: 针对铁磁性/非铁磁性的脉冲涡流缺陷检测,建立了磁屏蔽下的脉冲涡流检测数值仿真模型,分析了两种金属构件磁屏蔽下的涡流、磁感线分布和涡流检测信号的作用机制。磁屏蔽主要包括线圈无磁屏蔽、线圈内磁屏蔽、线圈外磁屏蔽、线圈内外磁屏蔽四种磁屏蔽方式。仿真结果表明:两种金属构件下的四种脉冲涡流缺陷检测磁屏蔽模型中,线圈内磁屏蔽措施对于提高脉冲涡流缺陷检测的灵敏度最有效。Abstract: In view of the pulsed eddy current flaw detection of ferromagnetic and non ferromagnetic metals, the numerical simulation models of pulsed eddy current testing under the magnetic shielding were established. The distribution of magnetic induction line and the mechanism of action of eddy current testing signal were researched. Magnetic shielding included: magnetic shielding within the coil, magnetic shielding outside the coil, magnetic shielding both inside and outside the coil. The simulation results show that magnetic shielding in the inner magnetic shielding of the coil can most effectively improve the sensitivity of defect detection for the ferromagnetic and non ferromagnetic metal in the four magnetic shielding models.
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