Journal ArticleDOI
A Computer-Controlled 36-Channel Time Domain Reflectometry System for Monitoring Soil Water Contents
Timo J. Heimovaara,Willem Bouten +1 more
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TLDR
In this article, a computer controlled time domain reflectometry (TDR) system is described which gives the possibility of making a large number of measurements at different sites at predetermined time intervals.Abstract:
Research on the spatial and temporal dynamics of soil water has long been impeded by the lack of an automated technique for the measurement of soil water content. A computer controlled time domain reflectometry (TDR) system is described which gives the possibility of making a large number of measurements at different sites at predetermined time intervals. The developed system operates on 12 V dc and has the capability to monitor water contents at 36 sites. The algorithm used for the automatic analysis of the measurements is also presented. It is based on the calculation of the travel time of the TDR signal between the beginning and the end of a three-wire probe.read more
Citations
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Journal ArticleDOI
Measuring Soil Water Content with Ground Penetrating Radar: A Review
TL;DR: A comprehensive review of methods to measure soil water content with ground penetrating radar (GPR) is presented in this article, where the authors distinguish four methods: reflected wave velocity, ground wave velocity and surface reflection coefficient.
Journal ArticleDOI
A Review of Advances in Dielectric and Electrical Conductivity Measurement in Soils Using Time Domain Reflectometry
TL;DR: This review examines issues such as the effective frequency of the TDR measurement and waveform analysis in dispersive dielectrics, and the growing importance of both waveform simulation and inverse analysis of waveforms is highlighted.
Journal ArticleDOI
Measuring Soil Water Content with Ground Penetrating Radar
TL;DR: In this paper, a comprehensive review of methods to measure soil water content with ground penetrating radar (GPR) is presented, which distinguishes four methodologies: reflected wave velocity, ground wave velocity and surface reflection coefficient.
Journal ArticleDOI
Measurement of soil water content and electrical conductivity by time domain reflectometry: a review
TL;DR: An overview of theoretical background for measuring water content and electrical conductivity is presented as well as characteristics of different types of probes in this article, and limitations of applying TDR techniques to measuring soil water and salinity are also addressed.
Journal ArticleDOI
On the spatio-temporal dynamics of soil moisture at the field scale
Harry Vereecken,Johan Alexander Huisman,Yakov Pachepsky,Carsten Montzka,J. van der Kruk,Heye Bogena,Lutz Weihermüller,Michael Herbst,Gonzalo Martinez,Jan Vanderborght +9 more
TL;DR: In this paper, the authors review the state of the art of characterizing and analyzing spatio-temporal dynamics of soil moisture content at the field scale and discuss measurement techniques that have become available in recent years and that provide unique opportunities to characterize field scale soil moisture variability with high spatial and temporal resolution.
References
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Journal ArticleDOI
Electromagnetic determination of soil water content: Measurements in coaxial transmission lines
TL;DR: The dependence of the dielectric constant, at frequencies between 1 MHz and 1 GHz, on the volumetric water content is determined empirically in the laboratory as discussed by the authors, and the effect of varying the texture, bulk density, temperature, and soluble salt content on this relationship was also determined.
Journal ArticleDOI
A method of measuring soil moisture by time-domain reflectometry
TL;DR: In this article, a method of measuring soil moisture on site by time domain reflectometry (TDR) based on the properties of electromagnetic waves is presented, which consists of measuring the transit time of waves along a probe in the soil.
Journal ArticleDOI
Improved field probes for soil water content and electrical conductivity measurement using time domain reflectometry
TL;DR: In this paper, the authors describe symmetric, multi-wire probes designed to minimize the unwanted noise and information loss due to impedance mismatch between the probe and the coaxial connecting cable.
Journal ArticleDOI
Time-domain reflectometry: simultaneous measurement of soil water content and electrical conductivity with a single probe.
TL;DR: Two parallel metallic rods were used as a wave guide to measure the dielectric constant and electrical conductivity of soils having different electrical conductivities but the same water content.