土壤水分测量中相位差检测算法的实验与研究  

Study on Algorithm of the Phase Difference Detection for Soil Moisture Measurement

作　　者：石庆兰[1] 董乔雪[1] 冯磊[1] 

机构地区：[1]中国农业大学信息与电气工程学院,北京100083

出　　处：《农机化研究》2011年第9期185-188,共4页Journal of Agricultural Mechanization Research

基　　金：国家"863"计划项目(2006AA10Z264)

摘　　要：TDR时域反射法是近些年发展起来的一种测定土壤含水量的新技术,因其快速、简便、高可靠性、高精度等优点受到越来越多的关注。为此,介绍一种在TDR时域反射法基础上发展起来的基于相位检测法的土壤水分测量技术,即基于相位检测的时域反射测量法(P-TDR)。针对时间差检测过程中的相位多值问题,提出了确定相位差测量值范围的解决算法,以及实际应用时的解决办法。同时,采用相位检测法设计的传感器对土壤水分测量的结果与烘干法的测量结果进行比较,验证了该方法的可靠性。Time Domain Reflectometry（TDR） is a relatively new method for the measurement of soil water content.The main advantages of TDR over other measurement methods are fast,simple,high reliability and superior accuracy.This article introduces the soil moisture measuring principle based on the phase time domain refletrometry（P-TDR） by detecting the time difference between the reflected signal and the reference one.The phase difference detection algorithm is proposed to solve the phase of multi-value problem.A practical application of the solution is also talked about.In order to verify the reliability of the method experiments were carried out.Compared with oven drying method,the experimental results showed the validity of the P-TDR method.

关 键 词：土壤水分测量 烘干法 时域反射法 相位检测 

分 类 号：S152.7[农业科学—土壤学]