基于气隙磁场分层耦合的直线时栅位移传感器研究

针对前期研制的电磁式直线时栅位移传感器高信噪比和高时间插补分辨力难以兼顾的问题,设计了一种提高传感器信噪 比的新传感器结构,另外提出了一种高信噪比、高时间插补分辨力的测量新方法,并研制了基于气隙磁场分层耦合的直线时栅位 移传感器。 建立传感器气隙磁场数学模型,分析气隙磁场空间分布特性,研究平面线圈气隙磁场分层耦合的原理;根据气隙磁场 分层耦合原理,建立传感器气隙磁场分层耦合位移测量模型;对传感器测量模型进行电磁场仿真和误差分析;最后,搭建实验平台 进行对传感器的性能进行测试。 实验结果表明,采用气隙磁场分层耦合的结构提高了传感器的信噪比,传感器的测量精度在原有 的基础上提高了 31. 4% ;采用的高信噪比和高时间插补分辨力测量方法,传感器的测量精度在原有的基础上提高了 37. 3% 。

Research on linear time-grating displacement sensor based on stratified coupling of air gap magnetic field

It is difficult to balance the high signal-to-noise ratio and high time interpolation resolution of the electromagnetic linear time gate displacement sensor developed in the early stage. To address this issue, a new sensor structure for improving the signal to noise ratio of the sensor is designed, and a new measurement method with high signal-to-noise ratio and high time interpolation resolution is proposed. A linear time gate displacement sensor based on stratified coupling of air gap magnetic field is developed. The mathematical model of the sensor air gap magnetic field is formulated, the spatial distribution characteristics of the air gap magnetic field are analyzed, and the principle of hierarchical coupling of the air gap magnetic field of the plane coil is studied. According to the principle of stratified coupling of air gap magnetic field, a stratified coupling displacement measurement model of the sensor air gap magnetic field is established. Electromagnetic field is simulated and error of sensor measurement model is analyzed. Finally, an experimental platform is built to test the performance of the sensor. The experimental results show that the structure of layered coupling of air gap magnetic field improves the signal-to-noise ratio of the sensor, and the measurement accuracy of the sensor is improved by 31. 4% on the original basis. The high signal-to-noise ratio and high time interpolation resolution measurement method are adopted. The measurement accuracy of the sensor is improved by 37. 3% on the original basis.