铁道科学与工程学报2016，Vol.13Issue(5)：827-835,9.
套管式TDR水分传感器侧向感应范围试验分析
Experi mental analysis of lateral inducting scope of access-tube ti me do main reflecto metry moistu re sensor
摘要
Abstract
The TDR access-tube moisture sensor can measure the spatial distribution of soil water continuously. In order to definite the accuracy,stability and lateral inducting scope of access-tube sensors,a set of sandbox models of square planar were designed that the length of the side range from 100 mm to 600 mm and the height is 400 mm.The calibration experiments for standard sand samples were carried out that the target water content was 10%.Analysis results show that when the side wall of the sandbox is located outside the inducting scope of TDR, the test error of water content is random error following normal distribution.The error interval is only (-0.41%,+0.41%)with 0.95 confidence level,thus meeting specification requirement of soil test that the difference of parallel determination is less than 1 .0%.The measuring accuracy reaches the nominal precision level of ±2%. According to the variation of water content with depth,TDR values pass the testing for homogeneity of coefficients of variation at the 0.05 significance level,which proved TDR has satisfactory stability.The invasion of side wall into inducting scope leads to significantly decreased TDR testing values;therefore,the inducting scope of TDR ac-cess-tube moisture sensor is a cross-sectional area that the side length is about 300 mm.关键词
套管式TDR/侧向感应范围/含水率/标定试验/砂箱模型Key words
TDR access-tube/lateral inducting scope/water content/calibration experiment/sandbox model分类
交通工程引用本文复制引用
张瑞国,罗强,蒋良潍,连继峰,张良..套管式TDR水分传感器侧向感应范围试验分析[J].铁道科学与工程学报,2016,13(5):827-835,9.基金项目
国家重点基础研究发展计划（973计划）项目 （）
