Article (Scientific journals)
Efficiency of end effect probes for in-situ permittivity measurements in the 0.5–6 GHz frequency range and their application for organic soil horizons study
Demontoux, F.; Razafindratsima, S.; Bircher, S. et al.
2017In Sensors and Actuators. A, Physical, 254, p. 78-88
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Keywords :
End effect probe; Moisture; Organic soil; Permittivity; Remote sensing; Dielectric properties; Efficiency; Permittivity measurement; Probes; Soils; Space optics; Waveguide components; Waveguides; Dielectric measurements; End effects; European Space Agency; Hydrologic parameters; In-situ measurement; Organic soil horizons; Remote sensing data; Soil surveys
Abstract :
[en] The remote signatures measured at microwave frequency above land surfaces are strongly dependent on the permittivity of the soil, which is linked to its moisture content. Thus, soil permittivity is a key parameter when algorithms are developed for the retrieval of hydrologic parameters from remote sensing data. Soil permittivity measurements are generally carried out in the laboratory because in-situ measurements are more difficult to obtain. The study presents the development of two probes (N and SMA probes) for in situ soil permittivity measurements (i.e. measurements of dielectric properties). They are based on the end effect phenomenon of a coaxial waveguide and so are called end effect probes in this paper. Results obtained on well-known materials (water and polytetrafluoroethene) are compared with corresponding data obtained by laboratory approaches (Von Hippel's method and resonant cavity) and show good agreement from 0.5 GHz up to ∼3.5 GHz and 6 GHz for N and SMA probes respectively. Then measurements made on concrete and mineral soil are reported to underline the efficiency of end effect probes for in-situ dielectric measurements. Finally, through work undertaken in the framework of the European Space Agency's SMOSHiLat project, we demonstrate the applicability of the two probes for measurements performed within these frequency ranges in complex material such as organic soil horizons. © 2016 Elsevier B.V.
Disciplines :
Electrical & electronics engineering
Environmental sciences & ecology
Author, co-author :
Demontoux, F.;  IMS Laboratory, University of Bordeaux, 16 Avenue Pey Berland, Pessac, 33607, France
Razafindratsima, S.;  I2M Laboratory, GCE Department, University of Bordeaux, Bordeaux, France
Bircher, S.;  Centre d'Etudes Spatiales de la Biosphère, Toulouse, France
Ruffié, G.;  IMS Laboratory, University of Bordeaux, 16 Avenue Pey Berland, Pessac, 33607, France
Bonnaudin, F.;  IMS Laboratory, University of Bordeaux, 16 Avenue Pey Berland, Pessac, 33607, France
Jonard, François  ;  Université de Liège - ULiège > Département de géographie > Systèmes d'information géographiques
Wigneron, J.-P.;  INRA, UMR 1391 ISPA, Villenave d'Ornon, F-33140, France
Sbartaï, M.;  I2M Laboratory, GCE Department, University of Bordeaux, Bordeaux, France
Kerr, Y.;  Centre d'Etudes Spatiales de la Biosphère, Toulouse, France
Language :
English
Title :
Efficiency of end effect probes for in-situ permittivity measurements in the 0.5–6 GHz frequency range and their application for organic soil horizons study
Publication date :
2017
Journal title :
Sensors and Actuators. A, Physical
ISSN :
0924-4247
eISSN :
1873-3069
Publisher :
Elsevier B.V.
Volume :
254
Pages :
78-88
Peer reviewed :
Peer Reviewed verified by ORBi
Available on ORBi :
since 21 September 2021

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