同步获取土壤介电与力学参数的实验系统

Experimental system for simultaneous collection of soil dielectric and mechanic parameters

土壤作为一种由惰性固体、活性固体、溶质、气体以及水组成的多元复合系统,决定了其物理特性实验研究的复杂性。针对土壤物理实验中多变量信息同步实时获取的客观需要,应用一个自行设计的双变量传感器和虚拟仪器(VI)技术,研制了一台能够同时测量土壤力学特性与介电特性的智能化测试系统。该系统既能在0～40cm深度之间提供土壤圆锥指数分布与含水率分布剖面,而且还可运用信号处理中的相关理论分析双变量传感器输出信号间的相关特性。该系统为在实验室中分析土壤介电特性和力学特性研究提供了一个智能化的基础实验平台,并已在与德国波恩大学农业工程研究所的合作研究中成功地应用于田间实际测量中。

Due to the fact that soil is the mixture of solid, liquid and air, the difficulties and complexities in studying soil physics may be diverse. In order to simultaneously analyze soil mechanics and dielectric property, an experimental system based on dual-sensor and virtual instrument techniques was developed. In particular, this system is able to characterize soil cone index and water content profiles at the depths of 0~40 cm. Additionally, the correlation of the dual signals associated with soil mechanics and dielectrics can also be treated quantitatively at real-time. As an application example of the designed system, a field test was conducted in a cooperation project with the Department of Agricultural Engineering, University of Bonn.