Reducing the Lift-Off Effect on Permeability Measurement for Magnetic Plates From Multifrequency Induction Data
Reducing the Lift-Off Effect on Permeability Measurement for Magnetic Plates From Multifrequency Induction Data
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DOI：
10.1109/tim.2017.2728338
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发表时间：
2018-01-01
影响因子：
5.6
通讯作者：
Qu, Zhigang
中科院分区：
文献类型：
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作者：
Lu, Mingyang;Zhu, Wenqian;Qu, Zhigang
在非磁性板和磁性板的涡流测量中，升力变化会引起误差。对于非磁性板，以前的工作已经进行了解决这个问题。在本文中，我们遵循类似的策略，但试图减少对磁板的另一个指数过零频率的升离效应。利用本文提出的算法，可以从测量的多频电感谱数据中得到修正后的指数，即补偿过零频率。由于过零频率是可以补偿的，通过Dodd和Deeds的方法推导磁导率与过零频率的关系，最终可以预测磁片的磁导率。通过数学运算推导出了该方法，并用仿真和实验数据对其进行了验证。抬升引起的渗透率误差可降低到7.5%以内。
Lift-off variation causes errors in eddy current measurement of nonmagnetic plates as well as magnetic plates. For nonmagnetic plates, previous work has been carried out to address the issue. In this paper, we follow a similar strategy, but try to reduce the lift-off effect on another index-zero-crossing frequency for magnetic plates. This modified index, termed as the compensated zero-crossing frequency, can be obtained from the measured multifrequency inductance spectral data using the algorithm we developed in this paper. Since the zero-crossing frequency can be compensated, the permeability of magnetic plates can finally be predicted by deriving the relation between the permeability and zero-crossing frequency from Dodd and Deeds method. We have derived the method through mathematical manipulation and verified it by both simulation and experimental data. The permeability error caused by liftoff can be reduced within 7.5%.