基于矩形线圈水平分量磁场分析的脉冲漏磁检测研究

发布时间：2018-05-24 14:27

  本文选题：脉冲漏磁 + 矩形线圈　； 参考：《传感技术学报》2017年06期

【摘要】：针对铁磁性材料金属的缺陷检测,提出了一种基于矩形线圈水平分量磁场分析的检测方法。在涡流和漏磁理论基础上,建立了矩形激励线圈检测仿真模型。仿真表明:矩形线圈的下方水平磁场平整,当线圈轴线与缺陷方向垂直时,线圈底部水平分量的磁场与缺陷形成90°夹角。在铁磁性金属材料中,铁和空气介质处相对磁导率不一致导致磁场的偏转,产生了较强的漏磁场。在非铁磁性金属中,磁感线在缺陷处分布较为平滑,并不存在漏磁现象。搭建了检测平台,并分别在缺陷边缘和上部放置了Hall和GMR巨磁阻传感器进行检测。实验结果表明:在铁板表面,z分量磁场是涡流场和漏磁场的矢量叠加,磁场强,但与缺陷深度并没有线性关系;x分量磁场是单一的漏磁场,与缺陷深度存在线性关系,可以对缺陷进行定量分析。
[Abstract]:In view of the defect detection of ferromagnetic material metal, a detection method based on the horizontal component magnetic field analysis of the rectangular coil is proposed. On the basis of the theory of eddy current and leakage magnetic field, a simulation model for the detection of rectangular exciting coil is established. In the ferromagnetic metal material, the relative magnetic permeability of iron and air is not consistent with the permeability of the air medium, resulting in a magnetic field deflection and a strong leakage magnetic field. In the non ferromagnetic metal, the magnetic sensing line is relatively smooth and does not exist in the leakage magnetic phenomenon. A detection platform is set up and respectively in the non ferromagnetic metal. Hall and GMR giant magnetoresistance sensors are placed on the edge and upper part of the defect. The experimental results show that on the surface of the iron plate, the magnetic field of the Z component is the superposition of the vector of the eddy field and the leakage field, and the magnetic field is strong, but it has no linear relation with the defect depth; the magnetic field of the x component is a single leakage magnetic field and has a linear relationship with the depth of the defect, and it can be carried out on the defect. Quantitative analysis.
【作者单位】： 江南大学机械工程学院;江苏省食品先进制造装备技术重点实验室;
【基金】：国家自然科学基金项目(51107053/E070104) 中国博士后基金项目(2012M520994)
【分类号】：TG115.284
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本文编号：1929387