单管计算电容式液位传感器的仿真与特性研究

Research on the Simulation and Characteristic of Single-Tube Cross Capacitance Liquid Level Sensor

计算电容式液位传感器采用计算电容原理,经过单管式轻量化的结构改良设计。为探究改良结构对传感器特性的影响,针对单管计算电容式液位传感器建立有限元模型,利用分析软件ANSYS仿真分析几个重要结构参数对传感器灵敏度的影响。特性试验表明:传感器输入输出曲线与仿真结果具有良好的一致性;在0~200 mm量程内传感器线性度为±0.8%,回程误差为±0.03 pF,液位测量的最大引用误差为-1.0%FS。该研究为计算电容式液位传感器的结构优化提供了理论基础,有利于该新型传感器在航空、航天燃料液位测量领域的应用推广。

Cross capacitance liquid level sensor is based on the principle cross capacitance. This is designed to form a single tube,which made it lightweight. In order to study the effects of the new structure on the transducer charac- teristic, the finite element model was deduced, then realized simulation analysis of the influence of several important structure parameters on the sensor sensitivity in use of the finite element software ANSYS. The results of characteris- tic test indicate that, the real input-output curve has a good consistency with the simulation results;during the range of measurement 0-200 ram,the sensor linearity is ±0.8%,the return stroke error is ±0.03 pF and the maximum quoted error of level measurement is -1.0% FS. The research provides scientific basis for optimizing the new sensor and is conductive to its application to fuel level measurement in aviation and aerospace.