CAJ | 학술논문

土壤湿度检测是自动灌溉控制系统中的一个关键因素.通过恒流源作用下的土壤探针试验,得到能够反应土壤湿度变化趋势的电阻和电容组合模型.根据该模型指出土壤湿度的信号采样应该是尽量接近瞬态过程的初始值,并设计了检测电路,实现湿度?脉冲宽度的转换,利用捕捉脉冲宽度的方法能够精确得到湿度值,同时针对湿度变化非线性曲线给出了自动控制系统中的检测控制策略,经过实际试验,设计的控制系统具有良好的稳定型和区分精度.
토양습도검측시자동관개공제계통중적일개관건인소.통과항류원작용하적토양탐침시험,득도능구반응토양습도변화추세적전조화전용조합모형.근거해모형지출토양습도적신호채양응해시진량접근순태과정적초시치,병설계료검측전로,실현습도?맥충관도적전환,이용포착맥충관도적방법능구정학득도습도치,동시침대습도변화비선성곡선급출료자동공제계통중적검측공제책략,경과실제시험,설계적공제계통구유량호적은정형화구분정도.
Soil moisture detection is a key link of automatic irrigation control system in this paper. A resistor and capacitor combination model which can reflect the change trend of soil moisture through soil probe by constant current source was ob?tained. According to the model,it is pointed out that the soil humidity signal sampling should be as close as possible to the tran?sient process of the initial value,and the design of the detection circuit and automatic control systems in the detection control strategy,through the actual test,the design of the control system has good stability and distinguishing accuracy.