基于高频电容法的耕地土壤水分检测研究

Study on Detection of Farmland Soil Moisture Based on High Frequency Capacitance Method

中文关键词:  土壤体积含水量  高频电容  介电特性  串联谐振

英文关键词:soil volumetric water content  high-frequency capacitance  dielectric property  series connection resonance

中文摘要:

      利用土壤的介电特性对土壤的体积含水量进行测量。采用高频电容法作为测量方法，分别对红壤土、潮土、水稻土3种耕地土壤的含水量进行了测量。首先进行测量原理的分析，根据土壤测试极板的等效高频电气模型与固定电感相串联求得测量极板的等效电容值与串联谐振频率的关系。然后经过计算与电路仿真，绘出谐振频率与土壤体积含水量的理论关系曲线。最后通过实验对3种耕地土壤的实际含水量进行了测量,得到了实际测量与理论值的对比图。经过分析测量结果,证明实际测量结果符合理论推算,具有实际应用的价值。

英文摘要:

      The volumetric water content of soil is measured by using dielectric property.Choosing the high frequency capacitance method as the measurement method,the water contents of three kinds of arable soil,like red soil,moisture soil and rice soil,are measured.Firstly,the test principle is analyzed,using high frequency electric model of testing plate of soil to connect with fixed inductor in series for getting the relationships between the equivalent capacitance of testing plate and series connection resonant frequency.Then,the theoretical relation curve of resonant frequency and soil volumetric water content is drawn through the process of calculation and circuit simulation.Eventually,by experiment to the water content of arable soil,the comparison chart between the practical measured value and theoretical value is obtained.The actual measurement result conforms the theoretical calculation,which has application value.