scholarly journals Time-domain and Frequency-domain Reflectometry Type Soil Moisture Sensor Performance and Soil Temperature Effects in Fine- and Coarse-textured Soils

2019 ◽  
Vol 35 (2) ◽  
pp. 117-134 ◽  
Author(s):  
Yan Zhu ◽  
Suat Irmak ◽  
Amit J. Jhala ◽  
Mehmet C. Vuran ◽  
Adriano Diotto
Keyword(s):  
Soil Moisture ◽  
Soil Temperature ◽  
Frequency Domain ◽  
Time Domain ◽  
Temperature Effects ◽  
Moisture Sensor ◽  
Sensor Performance ◽  
Soil Moisture Sensor ◽  
Frequency Domain Reflectometry

scholarly journals Influência da Densidade na Estimativa da Umidade Volumétrica em um Latossolo Vermelho-Amarelo (Influence of Density in Estimation of Volumetric Moisture an Oxisol)

2013 ◽  
Vol 5 (5) ◽  
pp. 1056 ◽  
Author(s):  
Carlos Alexandre Barros de Almeida ◽  
Antonio Celso Dantas Antonino ◽  
Rejane Magalhaes de Mendonça Pimentel ◽  
Carlos Alberto Brayner de Oliveira Lira ◽  
José Romualdo de Sousa Lima
Keyword(s):  
Dielectric Constant ◽  
Soil Moisture ◽  
Bulk Density ◽  
Time Domain ◽  
Time Domain Reflectometry ◽  
Calibration Equation ◽  
Moisture Sensor ◽  
Soil Moisture Sensor ◽  
Volumetric Soil Moisture ◽  
Use Of Time

A estimativa da umidade volumétrica do solo pode ser realizada por vários métodos, entre eles destaca-se o uso da Reflectometria no Domínio do Tempo (TDR). Este tem como uso padrão, uma equação que relaciona a constante dielétrica do meio com a umidade sugerida pelo manual do fabricante. Este estudo objetivou avaliar a medição a umidade volumétrica do solo pelo sensor CS616. Na sua realização foi feita a calibração deste sensor em laboratório, para quatro camadas em um Latossolo Vermelho-Amarelo que apresentam densidades diferentes. Foram utilizados cinco métodos diferentes, três consagrados pela literatura e outros dois sugeridos por esse estudo. Os resultados permitiram concluir que nesse solo há uma grande disparidade entre os resultados encontrados durante a calibração do sensor e que a densidade do solo é um parâmetro importante nas medições de umidade do solo.Palavras-chave: reflectometria no domínio do tempo, medição direta da água no solo, equação de calibração Influence of Density in Estimation of Volumetric Moisture an Oxisol ABSTRACTThe estimation of volumetric soil moisture can be accomplished by various methods, among them stands out the use of Time Domain Reflectometry (TDR). This standard is to use an equation that relates the dielectric constant of the medium with humidity suggested by the manufacturer's manual. This study aimed to evaluate the measured volumetric soil moisture sensor for the CS616. In its realization was made to calibrate this sensor in the laboratory for four layers in an Latossolo Vermelho-Amarelo which have different densities. Was used five different methods, the literature established three and two others suggested by this study. The results showed that this soil there is great disparity between the results obtained during calibration of the sensor and the bulk density is an important parameter in measurements of soil moisture.Keywords: time domain reflectometry, direct measurement of soil water, calibration equation

Automatic fault detection in a low cost frequency domain (capacitance based) soil moisture sensor

2017 ◽  
Vol 183 ◽  
pp. 41-48 ◽  
Author(s):  
M.J. Oates ◽  
K. Ramadan ◽  
J.M. Molina-Martínez ◽  
A. Ruiz-Canales
Keyword(s):  
Soil Moisture ◽  
Fault Detection ◽  
Frequency Domain ◽  
Low Cost ◽  
Moisture Sensor ◽  
Soil Moisture Sensor

An Analysis of the Effects on Calibration Parameters of FDR for Moisture Sensor Caused by Different Kinds of Soils

2013 ◽  
Vol 401-403 ◽  
pp. 968-973
Author(s):  
Hai Bo Chen ◽  
Lin Mao Ye ◽  
Li Kui Shi
Keyword(s):  
Soil Moisture ◽  
Sandy Soil ◽  
Experimental Result ◽  
Sensor Calibration ◽  
Soil Columns ◽  
Moisture Sensor ◽  
Soil Moisture Sensor ◽  
Calibration Experiment ◽  
Frequency Domain Reflectometry ◽  
Calibration Parameters

With the method of artificial soil columns, several kinds of soil, such as, loam, clay, and sandy soil were used for FDR (frequency domain reflectometry) moisture sensor calibration experiment. Then, these data showed that the frequency of soil moisture sensor is monotone decreasing with the increase of soil volumetric water content, so the correlation is obvious. Different kinds of soil affected moisture sensor parameter remarkably. A better result would be obtained in classification calibration than that in concentration calibration. This experimental result had a great meaning for fine calibration of soil water automatic detector in the areas with complex kinds of soil.

Temperature compensation in a low cost frequency domain (capacitance based) soil moisture sensor

2017 ◽  
Vol 183 ◽  
pp. 86-93 ◽  
Author(s):  
M.J. Oates ◽  
A. Fernández-López ◽  
M. Ferrández-Villena ◽  
A. Ruiz-Canales
Keyword(s):  
Soil Moisture ◽  
Frequency Domain ◽  
Temperature Compensation ◽  
Low Cost ◽  
Moisture Sensor ◽  
Soil Moisture Sensor
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