ELECTRICAL PROPERTIES OF COAL AS A FUNCTION OF TEMPERATURE AND FREQUENCY, POLARIZATION, AND DIRECTION OF THE ELECTROMAGNETIC WAVE FOR UCG APPLICATION.

Constantine A. Balanis, J. L. Jeffrey, Y. K. Yoon

Research output: ResearchChapter

Abstract

The development of electromagnetic systems to detect and monitor an in-situ underground coal gasification process requires a knowledge of the electrical properties of coal. Using a two-path interferometer at microwave frequencies, the samples were tested as a function of temperature, electric field polarization and direction of the coal samples. There were not any significant changes in the electrical properties of coal as a function of temperature from ambient up to 700 degree F. However, there were significant variations in the conductivity as a function of polarization, with the vertical polarization possessing lower conductivity. Measurements of electrical properties of coal were also made in the 0. 5-100 MHz region using capacitance techniques. In general, there was a decrease in the values of dielectric constant and an increase in conductivity as the frequency increased.

LanguageEnglish (US)
Title of host publicationUnknown Host Publication Title
Pages335-341
Number of pages7
StatePublished - 1800
Externally publishedYes
EventProc of the Annu Underground Coal Convers Symp, 3rd, Fallen Leaf Lake -
Duration: Jun 6 1977Jun 9 1977

Other

OtherProc of the Annu Underground Coal Convers Symp, 3rd, Fallen Leaf Lake
Period6/6/776/9/77

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Electromagnetic waves
Electric properties
Coal
Polarization
Temperature
Coal gasification
Microwave frequencies
Interferometers
Permittivity
Capacitance
Electric fields

ASJC Scopus subject areas

  • Engineering(all)

Cite this

ELECTRICAL PROPERTIES OF COAL AS A FUNCTION OF TEMPERATURE AND FREQUENCY, POLARIZATION, AND DIRECTION OF THE ELECTROMAGNETIC WAVE FOR UCG APPLICATION. / Balanis, Constantine A.; Jeffrey, J. L.; Yoon, Y. K.

Unknown Host Publication Title. 1800. p. 335-341.

Research output: ResearchChapter

Balanis, CA, Jeffrey, JL & Yoon, YK 1800, ELECTRICAL PROPERTIES OF COAL AS A FUNCTION OF TEMPERATURE AND FREQUENCY, POLARIZATION, AND DIRECTION OF THE ELECTROMAGNETIC WAVE FOR UCG APPLICATION. in Unknown Host Publication Title. pp. 335-341, Proc of the Annu Underground Coal Convers Symp, 3rd, Fallen Leaf Lake, 6/6/77.
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