Measurement of Ferromagnetic Slabs Permeability Based on a Novel Planar Triple-Coil Sensor
Measurement of Ferromagnetic Slabs Permeability Based on a Novel Planar Triple-Coil Sensor
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DOI：
10.1109/jsen.2019.2957212
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发表时间：
2020-03-15
影响因子：
4.3
通讯作者：
Peyton, Anthony
中科院分区：
文献类型：
--
作者：
Lu, Mingyang;Meng, Xiaobai;Peyton, Anthony
电涡流方法因其灵敏度高、便于携带(当使用远程电磁传感器时)而被广泛用于铁磁性样品的电磁特性测量。然而，在各种应用中，涡流测量总是受到提离变化--传感探头与样品之间的间隙--的影响。在本文中，采用所研制的平面三线圈传感器，可以显著减小提离变化引起的磁导率测量误差。建立了一种利用被测阻抗或电感的相位来估算磁导率的单频涡流算法，即单频涡流算法。通过对几个铁磁样品的实验，证明了利用该传感器和逆算法测量的磁导率几乎不受提离变化的影响。
Eddy current methods are wildly used for measuringthe electromagnetic property of ferromagneticsamples due to its high sensitivities and portability (when using the remote electromagnetic sensor). However, in diverse applications, the eddy current measurement is always hampered by the lift-off variation - the gap between the sensing probe and the sample. In this paper, the measurement error of the permeability caused by the lift-off variation could be significantly reduced when using a developed planar triple-coil sensor. An inverse algorithm, the single-frequency eddy current algorithm is established for the evaluation of the permeability by referring to the phase of themeasured impedance or inductance. Based on the experiments of several ferromagnetic samples when using the developed sensor and inverse algorithm, the measured permeability is proved can be almost immune to the lift-off variations.