CAJ | 학술논문

为了消除电容土壤水分检测中电导影响,提出了基于附加电阻的高频电容土壤水分测定技术,分析了高频电容土壤水分传感器的机理, 建立了基于附加电阻的高频土壤水分数学模型,通过求解土壤水分引起的电容因子,消除了电导的影响,设计了基于附加电阻的平行板电容传感器土壤水分测试电路,并进行土壤测试试验.结果表明:土壤水分引起的电容值与土壤的质量含水率在1%～22%范围内呈线性关系,且基于附加电阻的高频电容土壤水分的测试值小于2%.
위료소제전용토양수분검측중전도영향,제출료기우부가전조적고빈전용토양수분측정기술,분석료고빈전용토양수분전감기적궤리, 건립료기우부가전조적고빈토양수분수학모형,통과구해토양수분인기적전용인자,소제료전도적영향,설계료기우부가전조적평행판전용전감기토양수분측시전로,병진행토양측시시험.결과표명:토양수분인기적전용치여토양적질량함수솔재1%～22%범위내정선성관계,차기우부가전조적고빈전용토양수분적측시치소우2%.
In order to eliminate the influence of conductance in measuring the capacitance soil moisture content, the high frequency capacitance soil moisture measurement technique based on the additional resistance was proposed. By analyzing the principle of the soil moisture sensor modulated with a high frequency, the mathematical model of soil water content using a high frequency based on the additional resistors was established. The measurement errors from this conductance were eliminated by solving the equations of capacitance factor from the soil moisture. A parallel board capacitive sensor detection circuit with additional resistors was designed, and the experiment of soil moisture measurement was conducted. The experimental result shows that the soil capacitance value from soil moisture is linear with the soil gravimetric moisture content by 1%-22%, and the soil moisture content value based on additional resistance can be measured below 2% error range of gravimetric moisture content.