双针结构土壤水分传感器探针最优长度分析与试验  

Optimal Analysis for Determining the Dual-pin Length of Soil Moisture Probe

作　　者：赵燕东[1] 聂铭君[1] 

机构地区：[1]北京林业大学工学院,北京100083

出　　处：《农业机械学报》2011年第11期39-43,共5页Transactions of the Chinese Society for Agricultural Machinery

基　　金：林业公益行业科研专项(200704040);国家自然科学基金资助项目(30671715);北京市教育委员会共建项目建设计划科学研究与科研基地建设项目(2008)

摘　　要：在两针平行式探针结构的阻抗模型的基础上,进一步理论推导了终端开路式和终端短路式两种类型土壤水分传感器探针长度与阻抗特性的关系。借助高频分析软件HFSS确定了两针平行式土壤水分传感器的最佳探针结构,并采用有机溶液模拟土壤体积含水率进行了试验,试验结果表明:终端开路式和终端短路式土壤水分传感器探针长度在0～8.3 cm时,其土壤体积含水率测量范围达到0～100%。A detailed analysis was provided based on the port impedance theory.The relationship between probe length and impedance characteristics of soil moisture sensors as terminal open or terminal short was deduced.With the aim to verify the theoretical conclusion,the simulation method by using high frequency structure simulator software（HFSS） and the experiment associated with several organic solutions as references of known dielectric constants were conducted.After a number of experiments,the result showed that the measuring range of soil moisture sensors as terminal open or terminal short,when probe length was within 0~8.3cm,could be up to 0~100%.

关 键 词：土壤水分 传感器 探针长度 阻抗特性 

分 类 号：S126[农业科学—农业基础科学]