A Linear Differential Inductive Displacement Sensor With Dual Planar Coils
A Linear Differential Inductive Displacement Sensor With Dual Planar Coils
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DOI：
10.1109/jsen.2018.2877209
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发表时间：
2019-01-15
影响因子：
4.3
通讯作者：
Kumar, V. Jagadeesh
中科院分区：
文献类型：
--
作者：
Sandra, K. R.;Kumar, A. S. Anil;Kumar, V. Jagadeesh
本文提出了一种非接触式位移传感器，采用一对蚀刻在印刷电路板 (PCB) 上的平面线圈和 E 型软铁磁芯。 E 型软铁磁芯在蚀刻在几个 PCB 上的两个三角形螺旋线圈上移动。两个线圈的电感变化与磁芯的位移呈三次多项式关系。适当的信号调节技术作用于电感并提供随位移线性变化的输出。传感器的对称结构提供了可忽略不计的横轴灵敏度。仿真研究和从具有 70 毫米范围和 2 μm 分辨率的原型传感器中获得的结果，经过构建和测试，确定了所提出技术的有效性。从原型观察到的最坏情况非线性为 0.4%。
A non-contact displacement sensor employing a couple of planar coils etched on printed circuit boards (PCBs) and an E-type soft ferromagnetic core is proposed here. The E-type soft ferromagnetic core moves over two triangular shaped spiral coils etched on a couple of PCBs. The variation in the inductances of the two coils has a cubic polynomial relationship with the displacement of the core. An appropriate signal conditioning technique operates on the inductances and provides an output that varies linearly with the displacement. The symmetrical structure of the sensor provides negligible cross axis sensitivity. Simulation studies and results obtained from a prototype sensor having a 70-mm range and a resolution of 2 mu m, built and tested, establish the efficacy of the proposed technique. The worst-case nonlinearity observed from the prototype is 0.4%.