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Journal of Radio Electronics Online scientific journal · eISSN 1684-1719
2023, № 1 · RADIO WAVE PROPAGATION

Influence of relaxations in soil water on the temperature dependence of soil permittivity

A. Karavayskiy1, Y. Lukin1

1 Kirensky Institute of Physics of the Siberian Branch of the Russian Academy of Sciences, Krasnoiarsk, Russia
Full text DOI: 10.30898/1684-1719.2023.1.4 UDC 537.86 EDN HBMRHE

Abstract

The influence of the dielectric constant spectra of bound and unbound water in mineral soil on the temperature dependences of the dielectric constant of mineral soil in the electromagnetic field frequency range from 50 MHz to 15 GHz was studied. The reasons for the appearance of the crossover frequency of the dielectric constant of mineral soil, obtained at different temperatures, but for a sample of the same moisture, were studied. It was proved that the appearance of crossover points in the frequency range up to 1.5 GHz is related to the Maxwell-Wagner effect in bound water. The dependences of the value of the crossover frequency of the dielectric constant of mineral soil on temperature and the volume content of bound and unbound water were studied.

  • dielectric constant
  • mineral soil
  • soil moisture
  • bound water
  • Maxwell-Wagner effect
Аннотация (на русском)

Влияние диэлектрических релаксаций почвенной воды на температурную зависимость диэлектрической проницаемости почвы

С помощью обобщенной рефракционной диэлектрической модели смеси изучено влияние спектров относительной диэлектрической проницаемости связанной и несвязанной воды в минеральной почве на характер температурной зависимости относительной диэлектрической проницаемости естественной минеральной почвы, с содержанием глинистой фракции 41,3 %, в диапазоне частот электромагнитного поля от 50 МГц до 15 ГГц. Изучены причины появления пересечений спектров относительной диэлектрической проницаемости минеральной почвы, полученных при различных температурах, но для образца одной влажности. Доказано, что появление такой точки пересечения в диапазоне частот до 1,5 ГГц связано с эффектом Максвелла-Вагнера в связанной воде. Изучены зависимости частоты точки пересечения спектров относительной диэлектрической проницаемости минеральной почвы от температуры и объемного содержания связанной и несвязанной воды.

For citation

Karavayskiy A., Lukin Y. Influence of relaxations in soil water on the temperature dependence of soil permittivity // Journal of Radio Electronics. – 2023. – No. 1. https://doi.org/10.30898/1684-1719.2023.1.4

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