搜索结果: 1-14 共查到“time domain reflectometry”相关记录14条 . 查询时间(0.049 秒)
Determining wave propagation characteristics of MV XLPE power cable using time domain reflectometry technique
Cross-linked polyethylene distribution power cables time domain reflectometry propagation constant attenuation constant phase constant propagation velocity
2011/3/22
In this paper, the wave propagation characteristics of single-phase medium voltage (MV) cross-linked polyethylene (XLPE) power cable are determined using time domain reflectometry (TDR) measurement te...
Estimation of Water Status by Relative Stem Water Measurement with Time Domain Reflectometry in Satsuma Mandarin
irrigation leaf water potential sheet mulching water stress
2010/11/24
In earlier research, we developed a system to measure the volumetric water content in the branches and trunks of satsuma mandarin (Citrus unshiu Marcow.) by portable Time Domain Reflectometry (TDR).
Solute Transport Measurements in Different Soil Types using Time Domain Reflectometry
Transport Measurements Soil Types Time Domain Reflectometry
2009/10/23
During recent years, time domain reflectometry (TDR) has proved to be a valuable tool for both water content (θ) and bulk electrical conductivity (σa) measurements. To allow resident solute concentrat...
Calibration of Time Domain Reflectometry for Water Content in Peat Soil
Time Domain Reflectometry Water Content Peat Soil
2009/10/22
Since peat soil differs from mineral soil in several respects, mineral-soil calibration
functions for time domain reflectometry (TDR) are not necessarily applicable.
This paper evaluates a number of...
Transect Scale Solute Transport Measured by Time Domain Reflectometry
Transect Scale Solute Transport Time Domain Reflectometry
2009/10/22
Two quasi steady-state solute transport experiments were carried out in a loamy
sand under field conditions. The flux was 40 mm/d in experiment 1 and 18.7
mm/d in experiment 2. Both water content (8...
测试土壤含水率和电导率的时域反射仪系统(Design of Time Domain Reflectometry for Application of Soil Moisture and Bulk Electrical Conductivity Measurements)
土壤 含水率 电导率 相对介电常数
2009/8/11
研究了用于土壤参数测试的时域反射仪(TDR)系统原理与电路实现方法。根据系统设计要求设计出时域反射仪样机,该样机脉冲发生电路产生140ps上升沿的时域脉冲,接收电路等效采样精度为8.69ps,并设计了时域反射仪系统控制程序,给出了程序的系统控制和数据处理流程图。利用研制的TDR样机对两种土壤样本的相对介电常数进行了测试,反演了土壤样品的体积含水率,同时利用采集波形反演计算出不同湿度土壤样品的体积含...
Volumetric Water Content in the Branches and Trunks of Satsuma Mandarin Measured by Time Domain Reflectometry
high quality fruit production mulch water management
2009/7/8
The volumetric water content (VWC) in the branches and trunks of satsuma mandarin (Citrus unshiu Marcow.) was measured using a stainless nail a sensor probe and a portable time domain reflectometry (T...
Evaluation of rainfall infiltration characteristics in a volcanic ash soil by time domain reflectometry method
Time domain reflectometry rainfall intensity volcanic-ash soil
2009/6/8
Time domain reflectometry (TDR) was used to monitor soil water conditions and to evaluate infiltration characteristics associated with rainfall into a volcanic-ash soil (Hydric Hapludand) with a low ...
Extension of the measurement range of electrical conductivity by time-domain reflectometry (TDR)
electrical conductivity time-domain reflectometry
2009/6/8
The electrical conductivity (EC) of a medium invaded by TDR sensors can be estimated from the impedance of a TDR reflectogram. Four categories of sensor were tested in salt solutions and the impedance...
Analysis of soil water dynamics in an agroforestry system based on detailed soil water records from time-domain reflectometry
soil water dynamics time-domain reflectometry agroforestry system
2009/5/27
Time domain reflectometry [TDR] was used to investigate the spatial and temporal variation in surface soil water dynamics under a number of types of vegetation, including both trees and crops grown in...
Efficient reconstruction of dispersive dielectric profiles using time domain reflectometry (TDR)
time domain reflectometry dispersive dielectric profiles
2009/5/13
We present a numerical model for time domain reflectometry (TDR) signal propagation in dispersive dielectric materials. The numerical probe model is terminated with a parallel circuit, consisting of a...
Practical considerations on the use of down-sized time-domain reflectometry (TDR) probes
TDR probepulse travel time dielectric constant electrical conductivity
2009/3/17
Nine time-domain reflectometry (TDR) probes, 2 to 10 cm long, were evaluated by comparing their measurement accuracy of TDR-pulse travel time in a sand and sandy loam soil, and electrical conductivity...
An automatic time domain reflectometry device to measure and store soil moisture contents for stand-alone held use
Time Domain Reflectometry TDR field device data logging soil moisture content
2008/11/26
A field setup was developed to measure soil moisture content on ten different positions using the Time Domain Reflectometry (TDR) technique. The setup has been designed to meet specific field demands...
Time domain reflectometry as a tool for the estimation of quality in foods
TDR microwave multivariate fish quality
2008/11/11
The EU 5th Framework project 慡EQUID?aims, by measuring and analysing different seafoods during different storage conditions, to develop an instrument which will allow the determination of quality or f...