Wideband Frequency Domain Method of Soil Dielectric Property Measurements

Бобров, П. П.; Repin, A. V.; Родионова, О. В.

doi:10.1109/tgrs.2014.2359092

Cited by 70 publications

(17 citation statements)

References 26 publications

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“…Open-ended probes can be used to measure dielectric properties of fine-grained soil [10]. For the purpose of soil complex dielectric permittivity determination in a broad frequency range, coaxial transmission line cells are used [11][12][13][14] which allow to measure larger sample-volumes than the open-ended probes. Reference [14] introduces a frequencydomain approach based on wideband scattering-parameter measurements of soil samples inserted into a measurement cell constructed out of a EIA 1-5/8" coaxial transmission line.…”

Section: Introductionmentioning

confidence: 99%

Salinity index determination of porous materials using open-ended probes

Szypłowska

Kafarski

Wilczek

et al. 2016

Meas. Sci. Technol.

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The relations among soil water content, bulk electrical conductivity and electrical conductivity of soil solution can be described by a number of theoretical and empirical models. The aim of the paper is to examine the performance of open-ended coaxial probes with and without a short antenna in determination of complex dielectric permittivity spectra, moisture and salinity of porous materials using the salinity index approach. Glass beads of 0.26 and 1.24 mm average diameters moistened to various water contents with distilled water and KCl solutions were used to model the soil material. Due to the larger sensitivity zone, only the probe with the antenna enabled determination of bulk electrical conductivity and salinity index of the samples. The relations between bulk electrical conductivity and dielectric permittivity of the samples were highly linear, which was consistent with the salinity index model. The slope of the relation between salinity index and electrical conductivity of moistening solutions closely matched the value for sand presented in literature.

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Section: Introductionmentioning

confidence: 99%

Salinity index determination of porous materials using open-ended probes

Szypłowska

Kafarski

Wilczek

et al. 2016

Meas. Sci. Technol.

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“…The measuring cells were coaxial-line segments with a diameter of 7/3 or 16/7 mm mm and a length of 2 to 10 cm. The measurement technique is described in (Bobrov et al, 2012;Bobrov et al, 2015). 1).…”

Section: Methodsmentioning

confidence: 99%

Dielectric permittivity spectra of oil–water-saturated sandy-clayey rocks of different mineralogical compositions and relaxation properties of water in these rocks

Бобров

Миронов

Repin

2015

Russian Geology and Geophysics

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Experimental measurements of the dielectric permittivity and equivalent conductivity of sandy-clayey samples (a mixture of river sand with bentonite or kaolin) saturated with salt-solution-diesel-fuel emulsions were performed in the frequency range from 10 kHz to 1 GHz at temperatures of 25-65 ºC. It is shown that when the content of the salt solution in the saturating fluid does not exceed 10%, the dielectric permittivity in the frequency range from 1 MHz to 1 GHz depends little on the mineral composition of the sample and on the concentration of the saturating solution. When the portion of water is 33.3% or higher, increasing the concentration of the salt solution leads to an increase in the equivalent conductivity and the real part of the complex dielectric permittivity. Using the refractive model of the complex dielectric permittivity, we have estimated the dielectric properties of bound water, which depend on temperature and the type of clay (bentonite or kaolin) in the sand-clay mixture but are independent of the water saturation and the amount of clay in the sample.

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“…Measurements of ε and ε were made using the technique described in [10] in frequency band from 0.1 kHz to 1 GHz using Rohde & Schwarz ZNB8 vector network analyzer (VNA) and the LCR-meter 3532-50 Hioki HiTESTER. Depending on the measured frequency band, the same cell was either directly connected to the VNA (for measuring in the band from 100 MHz to 1 GHz) or included into the break of the central conductor of a coaxial line of a large cross section (for measuring in the band from 300 kHz to 100 MHz).…”

Section: Experiments Descriptionmentioning

confidence: 99%

“…Therefore, the authors did not pay due attention to the role of the phenomenon of dielectric relaxation caused by polarization of waterair border. We succeeded to find, using a broadband method of measurement of CDP measurement [10], that the phenomenon of hysteresis of CDP looks differently at various frequencies, and the dielectric relaxation is its reason [11].…”

Section: Introductionmentioning

confidence: 99%

Electromagnetic Waves Attenuation in the Sandstones With Grains of Different Size at Imbibition and Drying

Бобров¹

2016

PIER M

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Abstract-The results of experimental measurements of the complex dielectric permittivity (CDP) of powders of quartz granules with different sizes saturated with water and salt solution of weak concentration are given in the frequency band from 20 kHz to 1 GHz. It is shown that at values of saturation level from 0.6 to 0.9 the relaxation phenomena caused by interfacial polarization on the water-air bound can be observed. The result shows considerable reduction of attenuation in gradually saturated rocks, which allows for deeper sensing during georadar mapping. It is determined that in the dielectric relaxation band and at frequencies below it the hysteresis of the real part of the CDP and equivalent specific conductivity can be observed. Its character significantly depends on the sizes of granules. It is shown that the behavior of CDP and attenuation of an electromagnetic wave at frequencies from 0.1 to 10 MHz complicatedly depends on the sizes of granules, saturation level, salinity of the saturating solution and saturation history.

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Wideband Frequency Domain Method of Soil Dielectric Property Measurements

Cited by 70 publications

References 26 publications

Salinity index determination of porous materials using open-ended probes

Salinity index determination of porous materials using open-ended probes

Dielectric permittivity spectra of oil–water-saturated sandy-clayey rocks of different mineralogical compositions and relaxation properties of water in these rocks

Electromagnetic Waves Attenuation in the Sandstones With Grains of Different Size at Imbibition and Drying

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