| 驻波法土壤水分测量系统的数学分析 |
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| 引用本文： | 石庆兰. 驻波法土壤水分测量系统的数学分析[J]. 农机化研究, 2010, 32(2) |
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| 作者姓名： | 石庆兰 |
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| 作者单位： | 中国农业大学,信息与电气工程学院,北京,100083 |
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| 基金项目： | 国家863计划项目(2006AA100209-02) |
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| 摘 要： | 介电法土壤水分测量中所涉及的公式一般是非线性的,在公式推导和绘制理论上的关系曲线时比较困难。为此,采用Matlab解决了上述问题,根据驻波法测量系统实际硬件电路参数推导出输出阻抗和传递函数的数学模型,再利用Topp公式等理论建立了以土壤含水率为自变量的系统传递函数的数学模型。利用Matlab对上述模型进行了仿真,得到了输出阻抗、介电常数及系统传递函数与土壤含水率的关系曲线。通过相关实验研究,验证了该数学模型的可行性。
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| 关 键 词： | 土壤水分测量 驻波法 传递函数 MATLAB |
On the Transfer Function Mathematical Model and Its Experimental Study for the Measurement of Soil Water Content System |
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| Shi Qinglan. On the Transfer Function Mathematical Model and Its Experimental Study for the Measurement of Soil Water Content System[J]. Journal of Agricultural Mechanization Research, 2010, 32(2) |
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| Authors: | Shi Qinglan |
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| Affiliation: | College of Information & Electrical Engineering China Agricultural University/a>;Beijing 100083/a>;China |
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| Abstract: | The increasing popularity of electromagnetic(EM) wave technique in Measuring Soil Water Content.It is critical to study on its mathematical model in order to improve the measuring accuracy of these instruments.At first this paper briefly introduce the working principle of a new type of soil moisture sensor based on Standing Wave Ratio(SWR).Then it derives the output impedance and the transfer function from practical hardware circuit parameters of the system.It also establishes the mathematical model using T... |
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| Keywords: | soil water content standing wave transfer function MATLAB |
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