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一种测定土壤水分传感器空间灵敏度的新方法

发表时间:2016-02-15  浏览量:2277  下载量:814
全部作者: 孙宇瑞,程强,赵燕东,薛绪掌,LAMMERSPeterSchulze,DAMEROWLutz
作者单位: 中国农业大学农业部农业信息获取技术重点实验室北京林业大学工学院;国家农业信息化工程技术研究中心;德国波恩大学农业工程研究所
摘 要: 提出一种根据冻土样本从圆柱侧壁内侧由外向内径向融化过程确定介电式土壤水分传感器空间灵敏度(volume of sensitivity,VOS)的新方法。该方法基于土壤冻融与干湿转换的介电等价性原理,确定/比较:1)两种不同类型的边缘场探针(管式和锥形)在砂土中间水平(θv=0.20 cm3·cm-3)的土壤含水量的空间灵敏度;2)锥形探针在砂土中3个不同水平下的空间灵敏度(θv=0.10,0.20,0.28 cm3·cm-3);3)管式探针在3种不同土壤质地下的VOS(砂土、砂壤土、粉质黏土). 锥形传感器确定半径的范围为3.0~4.1 cm,管式传感器确定半径的范围为5.1~8.5 cm. 这些结果有利于改善介电式土壤水分传感器的技术设计以及了解土壤物理性质对VOS的影响。
关 键 词: 农业工程;土壤水分传感器;土壤含水量;空间灵敏度
Title: A novel method to determine the volume of sensitivity for soil moisture sensors
Author: SUN Yurui, CHENG Qiang, ZHAO Yandong, XUE Xuzhang, LAMMERS Peter Schulze, DAMEROW Lutz
Organization: Key Laboratory of Agri-informatics, ministry of Agriculture, China Agricultural University; School of Technology, Beijing Forestry University; National Engineering Center for Information Technology in Agriculture; Department of Agricultural Engineering, University of Bonn
Abstract: This study presented a novel method to determine the volume of sensitivity (VOS) for dielectric sensors by frozen soil columns radially thawing from outside inward. The method is based on physical equivalence of the dielectric properties between soil drying-wetting and freezing-thawing transitions. We applied this method to determine/compare: 1) The VOSs of two types of fringing field probes (tube type and cone type) with sandy silt loam samples at a middle level of soil moisture content (θv= 0.20 cm3·cm-3). 2) The VOSs of the cone-type probe with sandy silt loam samples at three levels (θv= 0.10, 0.20, 0.28 cm3·cm-3). 3) The VOSs of the tube type probe with three soil textural samples (sand, sandy silt loam and silty clay). The determined radii of the cone-type sensor ranged from 3.0 cm to 4.1 cm and those of the tube-type sensor ranged from 5.1 cm to 8.5 cm. These results could be beneficial for improving the technical design of soil dielectric sensors and understanding the effect of soil physical properties on the VOS.
Key words: agricultural engineering; soil moisture sensors; soil water content; volume of sensitivity
发表期数: 2016年2月第3期
引用格式: 孙宇瑞,程强,赵燕东,等. 一种测定土壤水分传感器空间灵敏度的新方法[J]. 中国科技论文在线精品论文,2016,9(3):264-269.
 
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