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Proceedings Paper

Finite-difference modeling of borehole georadar data
Author(s): Klaus Holliger; T. Bergmann
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Paper Abstract

High-frequency electromagnetic wave propagation in the vicinity of boreholes is complex and can be described only partially by analytical or asymptotic methods. To improve our understanding of the governing physical processes we present a finite-difference solution of Maxwell's equations in cylindrical coordinates. This approach allows us to model the full electromagnetic wavefield associated with a typical borehole georadar experiment and to assess the adequacy of the ray-based interpretation methods currently used. We find that the nature of the medium filling the borehole or changes in the material properties along the borehole wall may have a major impact on the amplitude radiation pattern. As a result of waveguide effects, the radiation pattern of a vertical electric dipole located in a water-filled borehole is significantly distorted with respect to the corresponding reference full-space radiation pattern. Even more severe distortions of the amplitude radiation pattern may result when the emitting or receiving antenna is located near material boundaries or near the upper or lower end of the borehole.

Paper Details

Date Published: 27 April 2000
PDF: 6 pages
Proc. SPIE 4084, Eighth International Conference on Ground Penetrating Radar, (27 April 2000); doi: 10.1117/12.383525
Show Author Affiliations
Klaus Holliger, Swiss Federal Institute of Technology/Zurich (Switzerland)
T. Bergmann, Univ. of Hamburg (Germany)

Published in SPIE Proceedings Vol. 4084:
Eighth International Conference on Ground Penetrating Radar
David A. Noon; Glen F. Stickley; Dennis Longstaff, Editor(s)

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