Abstract of the paper ``FDFD: A 3D finite-difference frequency-domain code for electromagnetic induction tomography''
with Nathan J. Champagne II and H. Michael Buettner
A new 3D code for ElectroMagnetic Induction Tomography (EMIT) with
intended applications to environmental imaging problems has been developed.
The approach consists of calculating the fields within a volume using an implicit
finite-difference frequency-domain (FDFD) formulation.
The volume is terminated by an anisotropic perfectly matched layer (PML) region
that
simulates an infinite domain by absorbing outgoing waves.
Extensive validation of this code has been done using analytical and
semianalytical
results from other codes and some of those results are presented in this paper.
The new code is written in Fortran 90 and is designed to be easily
parallelized, but this feature has yet to be tested.
Finally, an adjoint method, developed for solving the
inverse problem for conductivity imaging (for mapping underground plumes),
uses this code as its forward field solver.
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