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土壤水分剖面实时测量传感器试验研究
引用本文:孙宇瑞,马道坤,何权,赵燕东.土壤水分剖面实时测量传感器试验研究[J].北京林业大学学报,2006,28(1):55-59.
作者姓名:孙宇瑞  马道坤  何权  赵燕东
作者单位:1.哈尔滨工业大学土木工程学院
基金项目:中国科学院资助项目 , 中南大学校科研和教改项目
摘    要:该文探讨了一种基于介电原理的、可实时测量土壤水分剖面分布的套筒式结构土壤水分传感器.由于麦克思维尔方程对边缘电磁场分布求解的局限性,研究过程中采用了以下技术路线:①借助于超高频矢量网络分析仪与有机标定液体相结合的办法分析传感器的高频特征参数;②根据获取的高频特征参数优化电路结构设计;③实验室环境下应用不同容积含水率的土样进行相关检验;④进一步分析套筒壁厚的影响;⑤针对一个由三种不同含水率构成的土柱进行穿层试验.试验数据统计分析表明,该传感器归一化频偏指数与土壤容积含水率之间呈线性关系. 

关 键 词:土壤水分    介电常数    测量
文章编号:1000-1522(2006)01-0055-05
收稿时间:01 12 2005 12:00AM
修稿时间:2005-01-12

Experimental study of a sensor for real-time measurement of soil moisture profile
SUN Yu-rui,MA Dao-kun,HE Quan,ZHAO Yan-dong.Experimental study of a sensor for real-time measurement of soil moisture profile[J].Journal of Beijing Forestry University,2006,28(1):55-59.
Authors:SUN Yu-rui  MA Dao-kun  HE Quan  ZHAO Yan-dong
Institution:1 .Department of Information and Electrical Engineering, China Agricultural University, Beijing, 100083, P. R. China; 2 .School of Technology, Beijing Forestry University, 100083, P.R. China.
Abstract:A soil-moisture profile sensor with a sliding probe and an accessing tube was designed and tested based on the principle of the dielectric theory. Due to the limitation of Maxwell equations for modeling the electric-fringe distribution, this research was conducted as the following procedures: 1) to determine the sensor's characterized parameters using a network analyzer and a variety of solvents with known relative electric constants; 2) to optimize the circuitry design with the identified electric parameters of the sensor; 3) to calibrate the sensor with different soil water contents under the laboratory conditions; 4) to validate the effect of the tube's thickness on the measurement results; 5) to perform a multi_layer test with a prepared soil column including three volumetric water contents. The statistic results of the measured data demonstrated a linear relationship between the normalized frequency shift of the sensor and soil volumetric water contents with a correlation coefficient of 0.95.
Keywords:soll water content  dielectric constant  measurement
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