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DETERMINATION OF ELECTRIC ROCK PARAMETERS FROM THE FIELD STRUCTURE OF A MAGNETIC DIPOLE *
Author(s) -
BITTERLICH W.,
KELLNER A. W.
Publication year - 1970
Publication title -
geophysical prospecting
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.735
H-Index - 79
eISSN - 1365-2478
pISSN - 0016-8025
DOI - 10.1111/j.1365-2478.1970.tb02127.x
Subject(s) - ellipse , polarization (electrochemistry) , anisotropy , dipole , dielectric , isotropy , magnetic field , magnetic dipole , field (mathematics) , computational physics , physics , geology , condensed matter physics , mineralogy , geometry , optics , mathematics , chemistry , quantum mechanics , pure mathematics , optoelectronics
A bstract In the theoretical part of the present paper, formulas have been analyzed for a magnetic dipole in a homogeneous and unbounded medium. The magnetic field is elliptically polarized in the region between the quasistatic zone and the far field. Since the position and the shape of the polarization ellipses depend on the complex wave number, k , it is possible to determine k by measuring the polarization ellipses. From k , the conductivity and the dielectric constant of the medium are easily calculated. The functions required for the measuring method have been computed and plotted in graphs. In the experimental part it was examined how far the theory may be applied to measurements of propagation through rock at frequencies ranging from 100‐1000 kHz. These measurements showed that reasonably defined mean values of rock parameters can be given only if the deviations of the field from the theoretically expected field are not too high. These deviations have been named field distortions and have been examined by means of statistical methods (variance ratio tests). Gallery cavity and inhomogeneity or anisotropy of the medium account for these distortions.