Analysis of the Liftoff Effect of Phase Spectra for Eddy Current Sensors
Analysis of the Liftoff Effect of Phase Spectra for Eddy Current Sensors
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DOI：
10.1109/tim.2007.908273
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发表时间：
2007-12
影响因子：
5.6
通讯作者：
W. Yin;R. Binns;S. Dickinson;C. Davis;A. Peyton
中科院分区：
文献类型：
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作者：
W. Yin;R. Binns;S. Dickinson;C. Davis;A. Peyton
本文提出了一种分析模型，描述了双空心线圈传感器时，电感的变化被放置在旁边的导电板。分析模型的分析表明，这样的传感器的相位签名几乎是抬离无关的。这一发现得到了数值评估的验证。本文还发现，铁氧体U芯传感器的相位签名可以近似的双空气芯传感器的类似大小，因此，具有类似的升力无关的属性。用一个样品U芯传感器旁边的金属板和磁性材料的测量验证了理论结果。
This paper presents an analytical model that describes the inductance change when a double air-cored coil sensor is placed next to a conducting plate. Analysis of the analytical model reveals that the phase signature of such a sensor is virtually liftoff independent. This finding is verified by numerical evaluations. This paper also finds that the phase signature of a ferrite U-cored sensor can be approximated by that of a double air-cored sensor of similar size and, therefore, possesses a similar liftoff-independent property. Measurements made with a sample U-cored sensor next to plates of nonmagnetic and magnetic materials verified the theoretical results.