A novel position sensor for pneumatic and hydraulic cylinder applications is presented in this article. The solid iron core conical in shape surrounded by axisymmetric coils is an essential part of the proposed position sensor. The axisymmetric coils are used for excitation and voltage measurements. The conical solid iron core is annealed to homogenize the magnetic properties and to increase the permeability of the conical solid iron core. This improves the performance of the position sensor in terms of sensitivity and linearity. Analytical and finite-element analyses are utilized along with measurements in order to analyze the performance of the position sensor. The position sensor performs measurements of excitation coil inductance and pickup coil voltages. Various frequencies are considered for the analysis and for the measurements. The measurement results show that the maximum linearity error is about 4% for the manufactured sensor and is calculated to have a maximum value of 1% for the theoretical model. The achievable resolution of the proposed sensor is about 0.4 mm.

中文翻译：

---

一种新型锥形铁芯位置传感器

本文介绍了一种用于气动和液压缸应用的新型位置传感器。由轴对称线圈包围的锥形实心铁芯是所提出的位置传感器的重要组成部分。轴对称线圈用于励磁和电压测量。锥形实心铁芯经过退火处理，使磁性均匀，增加锥形实心铁芯的磁导率。这提高了位置传感器在灵敏度和线性度方面的性能。分析和有限元分析与测量一起使用，以分析位置传感器的性能。位置传感器执行励磁线圈电感和拾波线圈电压的测量。各种频率被考虑用于分析和测量。测量结果表明，制造的传感器的最大线性误差约为 4%，计算得出理论模型的最大值为 1%。所提出的传感器的可实现分辨率约为 0.4 mm。