ELECTROMAGNETIC SCATTERING FROM BURIED WIRES

Geophysics ◽  
1978 ◽  
Vol 43 (4) ◽  
pp. 767-781 ◽  
Author(s):  
Raymond D. Watts
Keyword(s):  
Fourier Transform ◽  
Plane Wave ◽  
Fast Fourier Transform ◽  
Electromagnetic Fields ◽  
Electromagnetic Scattering ◽  
Transverse Electric ◽  
Layered Earth ◽  
Source Field

The fast Fourier transform is used to compute the electromagnetic fields scattered by a long straight conductor buried in a layered earth. The source field is a transverse‐electric plane wave. A conductor buried less than 0.25 skin‐depths disturbs the ambient fields significantly. The position and depth of the conductor can be determined from the observed fields. A method for including several conductors, including their interactions, is discussed.

A fast, high-order quadrature sampled pre-corrected fast-Fourier transform for electromagnetic scattering

2003 ◽  
Vol 36 (5) ◽  
pp. 343-349 ◽  
Author(s):  
Stephen Gedney ◽  
Aiming Zhu ◽  
Wee-Hua Tang ◽  
Gang Liu ◽  
Peter Petre
Keyword(s):  
Fourier Transform ◽  
Fast Fourier Transform ◽  
Electromagnetic Scattering ◽  
High Order

scholarly journals EM RESPONSE OF AN ARBITRARY SOURCE ON A LAYERED EARTH: A NEW COMPUTATIONAL APPROACH

Geophysics ◽  
1975 ◽  
Vol 40 (5) ◽  
pp. 773-789 ◽  
Author(s):  
J. Lajoie ◽  
J. Alfonso‐Roche ◽  
G. F. West
Keyword(s):  
Fourier Transform ◽  
Fast Fourier Transform ◽  
Substantial Reduction ◽  
Theoretical Development ◽  
Electromagnetic Response ◽  
Fast Fourier Transform Algorithm ◽  
Large Area ◽  
Galvanic Current ◽  
Layered Earth ◽  
Rectangular Coordinates

The electromagnetic response of a layered earth is expressed in rectangular coordinates and the solution is obtained as a double inverse Fourier transform. This simplilfies the theoretical development for any EM source, grounded or not, and the fast Fourier transform algorithm may be used to evaluate the fields. In some cases where complicated source geometries are used and where the fields are required over a large area or volume, the procedure may lead to a substantial reduction in computation costs. The standard problems of the numerical fast Fourier transform algorithm may be overcome by using correction techniques such as pre‐aliasing. An analysis of the ground‐wire EM source shows that the infinite line is a poor approximation to the long grounded line due to the strong component of galvanic current in the ground.

Sign in / Sign up

Export Citation Format

Share Document