Electromagnetic Inverse Scattering Problems for Strong Scatterers
Otto, Gregory Patrick
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https://hdl.handle.net/2142/72022
Description
Title
Electromagnetic Inverse Scattering Problems for Strong Scatterers
Author(s)
Otto, Gregory Patrick
Issue Date
1993
Doctoral Committee Chair(s)
Chew, Weng C.
Department of Study
Electrical Engineering
Discipline
Electrical Engineering
Degree Granting Institution
University of Illinois at Urbana-Champaign
Degree Name
Ph.D.
Degree Level
Dissertation
Keyword(s)
Engineering, Electronics and Electrical
Physics, Electricity and Magnetism
Abstract
The application of electromagnetic waves to inverse scattering problems can provide information about a distant object or allow an object to be analyzed without using invasive procedures. This dissertation develops two-dimensional theories for solving the inverse scattering problem of strong scatterers, especially metallic objects and high-contrast dielectric objects. These theories advance the solutions of nonlinear inverse problems, which are useful for practical problems. Applications requiring a full nonlinear solution include medical and geophysical settings.
The work presented here uses full-wave multiple scattering solutions to completely model the wave-object interaction. This treatment allows sharp resolution capability, even though no initial guess is assumed. Both polarizations are investigated, and the solutions are found to surpass other methods for high-contrast objects. Time-harmonic data are used to reconstruct some near-resonant objects, as well as some lossy objects. Perhaps the most notable contribution of this work is the definition of a new object function, which reduces the nonlinearity between the unknown body and the scattered field it produces.
To help bridge the gap between theory and application, a microwave imaging array is constructed. Then, a calibration procedure is devised to relate the measured data to the theoretical work. The successful use of experimental strong scattering data in the new algorithms reveals the benefit of the theories developed in this dissertation.
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