附加电阻高频电容法土壤水分传感器的研究  

Research of Soil Water Content Sensor Using a High Frequency Capacitance with an Additional Resistor

作　　者：王晓雷[1] 任学军[2] 胡敬芳[1] 赵媛媛[1] 赵向阳[1] 胡建东[1] 

机构地区：[1]河南农业大学机电工程学院,河南郑州450002 [2]商丘职业技术学院计算机系,河南商丘476000

出　　处：《河南农业大学学报》2008年第6期689-692,共4页Journal of Henan Agricultural University

摘　　要：分析了高频电容土壤水分传感机理,建立了附加电阻高频土壤水分数学模型,设计了附加电阻平行板电容传感器检测电路,并进行实际土壤测试实验.结果表明,土壤电容值与土壤的重量含水量近似成线性关系,在1%的土壤水分含量误差范围内,能够准确地测定土壤水分含量,消除了电导引起的测量误差.By analyzing the principle of the soil water sensor modulated with a high frequency,the mathematic model of soil water content using a high frequency, and a parallel board capacitive sensor detection circuit with additional resistor was designed, and the factual soil experiment on water content was conducted. The experimental results showed that the soil capacitance value was linear with the soil gravimetric water content, the soil water content could be measured within 1% error range of gravimetric water content ,the measurement errors from this conductance were eliminated by solving the equations.

关 键 词：附加电阻 土壤水分含量 高频电容 

分 类 号：TH83[机械工程—仪器科学与技术]