Abstract
Diffraction tomography (DT) is a quantitative technique for high-resolution subsurface imaging. In general, DT algorithms are used for subsurface imaging with propagating waves. In this study an imaging algorithm is developed and tested for use with broadband electromagnetic induction for a so-called `multimonostatic' measurement geometry; a primary and secondary coil are coincident and move in unison over a uniformly spaced grid, on or above the ground surface. The algorithm is formulated in three dimensions and tested on simulated data for inhomogeneities that are both two and three dimensional. The algorithm is also applied, in two dimensions, to data acquired over a pair of parallel tunnels. One important finding is that good images can be reconstructed when the frequency band is limited to the case where all skin depths are greater than the depth of inhomogeneities.
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