Dielectric Properties of Glass Beads with Talc as a Reference Material for Calibration and Verification of Dielectric Methods and Devices for Measuring Soil Moisture

J. Szerement , Hironobu Saito , Kahori Furuhata , Shin Yagihara , A. Szypłowska , Arkadiusz Lewandowski , M. Kafarski , A. Wilczek , Jacek Majcher , Aleksandra Woszczyk , W. Skierucha

Abstract

This paper presents dielectric measurements of talc, glass beads, and their mixtures under different moisture and salinity levels. The measurements were conducted using a prototype seven-rod probe (15 mm long central rod) connected to a single port of vector network analyzer. The samples were moistened with distilled water and KCl solutions in order to obtain six different moisture content levels. The complex dielectric permittivity was determined from vector network analyzer reflection-coefficient measurements based on the open-water-liquid calibration procedure. Next, the fitting of volumetric water content–real part of dielectric permittivity calibration curves was performed for each material at selected frequencies, and the obtained relations were compared with well-known calibration equations. Additionally, a salinity index for the tested materials was calculated. It was concluded that pure talc is not an optimal material for the calibration and verification of dielectric methods. The calibration curves obtained for glass beads and the mixtures of glass beads with talc gave results close to well-known reference calibration functions. Additionally, the addition of talc caused the data points to be less scattered. Moreover, the values of the salinity index for the tested materials were in a good agreement with literature data for sand. The obtained results indicated that glass beads with the addition of talc can be used as a reference material for the calibration and verification of dielectric methods and devices for soil moisture measurement.
Author J. Szerement
J. Szerement,,
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, Hironobu Saito
Hironobu Saito,,
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, Kahori Furuhata
Kahori Furuhata,,
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, Shin Yagihara
Shin Yagihara,,
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, A. Szypłowska
A. Szypłowska,,
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, Arkadiusz Lewandowski (FEIT / PE)
Arkadiusz Lewandowski,,
- The Institute of Electronic Systems
, M. Kafarski
M. Kafarski,,
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, A. Wilczek
A. Wilczek,,
-
, Jacek Majcher
Jacek Majcher,,
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, Aleksandra Woszczyk
Aleksandra Woszczyk,,
-
et al.`
Journal seriesMaterials, ISSN 1996-1944
Issue year2020
Vol13
No8
Pages1 - 12
Publication size in sheets0.55
Keywords in Englishseven-rod probe; dielectric properties; frequency-domain reflectometry; dielectric permittivity; moisture; salinity
ASJC Classification2500 General Materials Science
DOIDOI:10.3390/ma13081968
URL https://www.mdpi.com/1996-1944/13/8/1968
Languageen angielski
File
materials-13-01968.pdf 4 MB
Score (nominal)140
Score sourcejournalList
ScoreMinisterial score = 140.0, 27-06-2020, ArticleFromJournal
Publication indicators Scopus Citations = 0; WoS Citations = 0; Scopus SNIP (Source Normalised Impact per Paper): 2017 = 1.285; WoS Impact Factor: 2018 = 2.972 (2) - 2018=3.532 (5)
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