Electromagnetic scattering by a two-dimensional inhomogeneity due to an oscillating magnetic dipole
A numerical method of computing the electromagnetic response of two-dimensional earth models to an oscillating magnetic dipole is presented. The generalized electromagnetic variational integral is reduced to a sum of two-dimensional variational integrals by Fourier transformation. Discretization of each two-dimensional integral is carried out in terms of the secondary electric fields by using the finite element method. Following the variational principle, each harmonic integral is reduced to a set of simultaneous equations. From each set of electric field solutions obtained by solving the simultaneous equations, the secondary magnetic fields are computed numerically. After inversely Fourier transforming the secondary electric and magnetic fields, the total fields are finally obtained by adding the analytically calculated primary fields. Because of the systematically implied continuity of the electric field in the finite element solution, the given discontinuous conductivity is modified to a continuous one across internal boundaries. The quality of the solution for the horizontal magnetic dipole is found to be relatively poor compared to that for the vertical magnetic dipole. It is not possible to perform an absolute numerical check of the solution due to the lack of another independently developed solution against which it can be checked. As an alternative the solutions for two-dimensional models were compared to those for some elongated three-dimensional models whose cross sections correspond to the two-dimensional models. 23 figures, 1 table.
- Research Organization:
- California Univ., Berkeley (USA). Lawrence Berkeley Lab.
- DOE Contract Number:
- W-7405-ENG-48
- OSTI ID:
- 6799647
- Report Number(s):
- LBL-8275
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
580203* -- Geophysics-- Geophysical Survey Methods-- (1980-1989)
657007 -- Electricity & Magnetism-- (-1987)
71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
ALGORITHMS
CALCULATION METHODS
DIPOLES
ELECTRICAL SURVEYS
ELECTROMAGNETIC FIELDS
ELECTROMAGNETIC RADIATION
ELECTROMAGNETIC SURVEYS
FINITE ELEMENT METHOD
FOURIER TRANSFORMATION
GEOLOGIC DEPOSITS
GEOPHYSICAL SURVEYS
INTEGRAL TRANSFORMATIONS
MAGNETIC DIPOLES
MATHEMATICAL LOGIC
MULTIPOLES
NUMERICAL SOLUTION
RADIATIONS
SCATTERING
TRANSFORMATIONS
TWO-DIMENSIONAL CALCULATIONS
VARIATIONAL METHODS