Bian Yuliang, Zhang Kun, Ma Tiehua
State Key Laboratory of Extreme Environment Optoelectronic Dynamic Measurement Technology and Instrument, School of Electrical and Control Engineering, North University of China, Taiyuan 030051, China.
Anhui Engineering Research Center for Intelligent Computing and Information Innovation, School of Computer and Information Engineering, Fuyang Normal University, Fuyang 236041, China.
Sensors (Basel). 2025 Jun 6;25(12):3578. doi: 10.3390/s25123578.
The traditional eddy current displacement sensor is limited by the diameter of the probe coil, and the measuring range is relatively small. In order to improve the range of an eddy current displacement sensor, a differential compensated eddy current displacement sensor (DCECDS) is proposed in this paper. The DCECDS is designed with three coils and is characterized by a large measuring range and good linearity. Based on the analysis of the working principle of DCECDS, the corresponding equivalent circuit model and mathematical model were established in this study. The effects of excitation frequency, inner diameter and thickness of excitation coil on the sensor performance were investigated. Based on the simulation results, the structural parameters of the sensor were designed and verified by experiments. The experimental results show that the measuring range of the DCECDS designed in this study can reach 1.76 times the diameter of the probe coil, which is 3.5 times higher than that of the traditional eddy current displacement sensor. The measuring range of the eddy current displacement sensor is effectively improved, which provides an important reference and practical value for the design of eddy current displacement sensors.
传统的涡电流位移传感器受探头线圈直径的限制，测量范围相对较小。为了提高涡电流位移传感器的量程，本文提出了一种差分补偿涡电流位移传感器（DCECDS）。DCECDS由三个线圈设计而成，具有量程大、线性度好的特点。基于对DCECDS工作原理的分析，本研究建立了相应的等效电路模型和数学模型。研究了激励频率、激励线圈内径和厚度对传感器性能的影响。基于仿真结果，设计了传感器的结构参数并通过实验进行了验证。实验结果表明，本研究设计的DCECDS的测量范围可达探头线圈直径的1.76倍，比传统涡电流位移传感器高3.5倍。有效提高了涡电流位移传感器的测量范围，为涡电流位移传感器的设计提供了重要参考和实用价值。
