Author: Chung Chi Lin
Publisher:
ISBN:
Category :
Languages : en
Pages : 342
Book Description
Numerical Modeling of Two-dimensional Time Domain Electromagnetic Scattering by Underground Inhomogeneities
Scientific and Technical Aerospace Reports
Electromagnetic Scattering by a Two-dimensional Inhomogeneity Due to an Oscillating Magnetic Dipole
Author:
Publisher:
ISBN:
Category :
Languages : en
Pages :
Book Description
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.
Publisher:
ISBN:
Category :
Languages : en
Pages :
Book Description
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.
Electromagnetic Scattering by Two-dimensional Inhomogeneity Due to an Oscillating Magnetic Dipole
L'Office du chrestien
IGARSS.
Finite Element and Finite Difference Methods in Electromagnetic Scattering
Author: Michael A. Morgan
Publisher: Elsevier Science & Technology
ISBN:
Category : Electromagnetic theory
Languages : en
Pages : 408
Book Description
Publisher: Elsevier Science & Technology
ISBN:
Category : Electromagnetic theory
Languages : en
Pages : 408
Book Description
Electromagnetic Scattering by Two-dimensional Inhomogeneities in the Earth
Author: Gerald Wayne Hohmann
Publisher:
ISBN:
Category :
Languages : en
Pages : 330
Book Description
Publisher:
ISBN:
Category :
Languages : en
Pages : 330
Book Description
Time-domain Computation of Electromagnetic Wave Scattering by the Method of Conforming Boundary Elements
Author: Andreas C. Cangellaris
Publisher:
ISBN:
Category :
Languages : en
Pages : 362
Book Description
Publisher:
ISBN:
Category :
Languages : en
Pages : 362
Book Description