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Transient electromagnetic modelling of an isolated wire loop over a conductive medium
Author(s) -
Persova Marina G.,
Soloveichik Yuri G.,
Trigubovich Georgy M.,
Vagin Denis V.,
Domnikov Petr A.
Publication year - 2014
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 - 10.1111/1365-2478.12122
Subject(s) - electrical conductor , transient (computer programming) , finite element method , loop (graph theory) , current (fluid) , electromagnetic field , mechanics , current loop , coupling (piping) , physics , transmitter , transient response , coaxial , acoustics , magnetic flux , magnetic field , electrical engineering , computer science , engineering , mechanical engineering , channel (broadcasting) , mathematics , operating system , combinatorics , quantum mechanics , thermodynamics
A large closed wire loop is generally used in field experiments for testing airborne electrical exploration equipment. Thus, methods are required for the precise calculation of an electromagnetic response in the presence of a closed wire loop. We develop a fast and precise scheme for calculating the transient response for such a closed loop laid out at the surface of a horizontally layered conductive ground. Our scheme is based on the relationship between the magnetic flux flowing through a closed loop and the current induced in it. The developed scheme is compared with 2D and 3D finite‐element modelling for several positions of an airborne electromagnetic system flying over a closed loop. We also study the coupling effect between the current flowing in the closed loop and the current flowing in the horizontally layered conductive medium. The result shows that for the central position of the transmitter, the difference between axisymmetrical finite‐element modelling and our scheme is less than 1%. Moreover, for the non‐coaxial transmitter–receiver–loop system, the solution obtained by our scheme is in good agreement with full 3D finite‐element modelling, and our total simulation time is substantially lower: 1 minute versus 120 hours.