边缘电场土壤水分传感技术研究

Technique Studies of a Fringing Field Sensor for Measuring Water Content in a Soil Sample

研究了一种新的用于土壤水分测量的边缘电场平面传感器,设计了平面电容土壤水分传感器的调制检测电路和数据处理系统,通过参数优化可以得到一种能够实现在线测试的土壤水分传感器及检测仪器.试验表明,随着土壤含水量的变化,其传感器的响应有较大的变化,且在低于25%的含水量范围,土壤含水量与被电压之间近似呈线性关系.

A fringing field sensor for sensing sample soil water content is introduced. A kind of modulating circuit and data acquisition system are designed for these applications. The system is able to perform realtime capacitance measurements, and process the data to obtain parameters of interest. Experimental data demonstrates good sensitivity to parameter variation, and a nearly linear dependency is observed between water content and the measured sample voltage. Experiment results indicate the feasibility of wide application of this technique in agriculture.