土壤水分传感器探头的仿真分析  

Simulation analysis of soil moisture sensor probe

作　　者：张颖[1,2,3] 行鸿彦 张旭[3] 周琦 刘钧 Zhang Ying;Xing Hongyan;Zhang Xu;Zhou Qi;Liu Jun(Collaborative Innovation Center for Meteorological Disaster Prediction and Evaluation,Nanjing University of Information Science and Technology,Nanjing 210044,China;Jiangsu Key Laboratory of Meteorological Detection and Information Processing,Nanjing University of Information Science and Technology,Nanjing 210044,China;Space New Meteorological Technology Co.,Ltd,Wuxi 214127,China;Huayun Sounding(BeiJing)Meterological Technology Co..Ltd.,Beijing 102299,China)

机构地区：[1]南京信息工程大学气象灾害预报预警与评估协同创新中心,南京210044 [2]南京信息工程大学江苏省气象探测与信息处理重点实验室,南京210044 [3]航天新气象科技有限公司,无锡214127 [4]华云升达(北京)气象科技有限责任公司,北京102299

出　　处：《电子测量与仪器学报》2021年第4期55-65,共11页Journal of Electronic Measurement and Instrumentation

基　　金：国家重点研发计划(2019YFE0131900);国家自然科学基金(61671248,41605121);江苏省重点研发计划项目(BE2018719);江苏省“信息与通信工程”优势学科计划项目资助。

摘　　要：在分析土壤介电常数的基础上,研究了电容式土壤含水率传感器的测量原理。利用ANSYS软件建立了电容式水分传感器探头的三维模型,研究了传感器探头结构参数发生变化时,传感器对其的电容值、电场强度分布、含水率探测深度及灵敏度的影响,确定了探头的最优尺寸参数,设计了一种基于频域反射法的电容式土壤含水率传感器。仿真实验结果表明,当探头环状电极半径28 mm、轴向宽度28 mm、电极间距12 mm、电极厚度1 mm时,探头的灵敏度、信号测量强度以及探测范围均与对照产品相比显著提升,为电容式土壤含水率传感器的结构设计提供了理论依据。Based on the analysis of soil dielectric constant,the measuring principle of capacitive soil moisture sensor is studied.This paper uses ANSYS software to establish a three-dimensional model of a capacitive moisture sensor probe,and studies the influence of the sensor on its capacitance value,electric field intensity distribution,moisture content detection depth and sensitivity when the structural parameters of the sensor probe change.Optimizing size parameters,a capacitive soil moisture content sensor based on frequency domain reflection method is designed.The simulation experiment results show that when the probe ring electrode radius is 28 mm,the axial width is 28 mm,the electrode spacing is 12 mm,and the electrode thickness is 1 mm,the sensitivity,signal measurement strength and detection range of the probe are significantly improved compared with the control product.It is a capacitive soil The structural design of the moisture content sensor provides a theoretical basis.

关 键 词：土壤含水量 电容式传感器 有限元 仿真计算 

分 类 号：TH765[机械工程—仪器科学与技术]