固相浓度电容传感器特性分析与结构参数优选  

Characteristic analysis and structural parameter optimization of solid-phase concentration capacitance sensor

作　　者：张西良[1] 胡国强 徐云峰[1,2] ZHANG Xiliang;HU Guoqiang;XU Yunfeng(School of Mechanical Engineering, Jiangsu University, Zhenjiang, Jiangsu 212013, China;Lanshen Group Co., Ltd., Nanjing, Jiangsu 211500, China)

机构地区：[1]江苏大学机械工程学院,江苏镇江212013 [2]蓝深集团股份有限公司,江苏南京211500

出　　处：《排灌机械工程学报》2021年第6期589-595,共7页Journal of Drainage and Irrigation Machinery Engineering

基　　金：国家自然科学基金资助项目(51175230);江苏省博士后科研资助计划项目(2021K086A)。

摘　　要：针对螺旋加料管道内固相物料浓度检测受固相分布影响大的问题,基于电容检测原理,设计螺旋表面极板电容传感器.采用有限元仿真方法,建立电容传感器的三维有限元模型,仿真分析电容传感器灵敏度场分布特性,以及源/检测极板张角、极板轴向长度、屏蔽罩半径、保护极板张角等结构参数对电容传感器检测场各项指标的影响.使用单因素轮换法,筛选出每个因素的理想水平范围.以减小均匀性误差为目标,选择正交试验以及方差分析法,得到各因素的主次顺序以及最优的因素组合,其灵敏度场均匀性误差参数为5.06%.设计检测场均匀性验证试验,搭建传感器实物,实测灵敏度场均匀性误差参数为5.43%,显著改善了传感器检测场的软场效应,减小固相分布对固相浓度检测的影响,满足实际应用需要.Aiming at the problem that the solid-phase material concentration detection in the spiral feeding pipeline is greatly affected by the solid-phase distribution,based on the capacitance detection principle,a spiral surface plate capacitance sensor was designed.The finite element simulation method was used to establish a three-dimensional finite element model of the capacitance sensor,and the sensitivity distribution characteristic of the capacitance sensor was simulated and analyzed.The influence of structural parameters such as source/detection plate angle,plate axial length,shield radius and protection plate angle on the indexes of the field of the capacitance sensor was analyzed.Using the single factor rotation method,the ideal level range of each factor was obtained.In order to reduce the uniformity error,the orthogonal experiment and variance analysis method were selected to obtain the prio-rity of each factor and the optimal combination of them,and the sensitivity field uniformity error para-meter is 5.06%.The uniformity verification test of detection field was designed,and the sensor was built.The measured sensitivity field uniformity error parameter is 5.43%,which significantly improves the soft field effect of the sensor detection field,reduces the influence of the solid-phase distribution on the detection of the solid-phase concentration,and meets the needs of practical applications.

关 键 词：电容传感器 浓度检测 螺旋加料 有限元仿真 灵敏度分布 

分 类 号：S237[农业科学—农业机械化工程]