地表相对介电常数实时监测系统设计  

Design of real-time monitoring system for surface relative permittivity

作　　者：李胤演 行鸿彦[1] 李浩琪 张怀洲 Li Yinyan;Xing Hongyan;Li Haoqi;Zhang Huaizhou(College of Electronics and Information Engineering,Nanjing University of Information Science&Technology,Nanjing 210044,China)

机构地区：[1]南京信息工程大学电子与信息工程学院,南京210044

出　　处：《电子测量技术》2023年第15期45-51,共7页Electronic Measurement Technology

基　　金：国家重点研发计划(2021YFE0105500);国家自然科学基金(62171228)项目资助

摘　　要：在雷暴云定位中,地表相对介电常数的测量至关重要。为解决地表介质连续监测难的问题,分析同面极板电容传感器测量原理,建立同面极板电容传感器理论模型,结合实际地表监测应用环境,完成传感器设计;引入电介质的德拜弛豫关系,研究契合地表介质测量的最佳驱动信号频率;设计信号调理电路,进行温湿度补偿,利用最小二乘法线性拟合最佳数据匹配函数,提高测量精度。实验结果表明,该系统测量误差小于5%,能够有效的对地表相对介电常数进行实时监测。In the location of thunderstorm clouds,the measurement of the relative dielectric constant of the ground surface is very important.In order to solve the problem of continuous monitoring of surface media,this paper analyzes the measurement principle of the same surface plate capacitance sensor,builds the design model of the same surface plate capacitance sensor,and completes the sensor plate design based on the actual surface monitoring application scenarios;The Debye relaxation relation of dielectrics is introduced to find the best driving signal frequency suitable for surface dielectric measurement;Design and build the signal measurement circuit,introduce temperature and humidity compensation,and improve the measurement accuracy;The least square method is used to linearly fit the best data matching function.The experimental results show that the measurement error of the system can be controlled within 5%,which can effectively monitor the relative permittivity of the ground in real time.

关 键 词：地表相对介电常数测量 同面极板电容传感器 温湿度补偿 

分 类 号：TH89[机械工程—仪器科学与技术]