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- Title
Electromagnetic imaging for shape and variable conductivity.
- Authors
Wei Chien; Chien-Ching Chiu
- Abstract
We consider the inverse problem of determining both the shape and the conductivity of a two-dimensional (2D) conducting scatterer from the knowledge of the far-field pattern of TM waves by solving the ill-posed nonlinear equation. Based on the boundary condition and measured scattered field, a set of nonlinear integral equations is derived and the imaging problem is reformulated into an optimization problem. Satisfactory reconstructions are achieved by the genetic algorithm. Numerical results demonstrate that, even when the initial guess is far away from the exact one, good reconstruction can be obtained. In addition, the effect of Gaussian noise on the reconstruction results is investigated. The numerical results show that multiple incident directions permit good reconstruction of shape and, to a lesser extent, conductivity in the presence of noise in measured data. © 2004 Wiley Periodicals, Inc. Int J RF and Microwave CAE 14, 433–440, 2004.
- Subjects
ELASTIC wave scattering; ELECTROMAGNETISM; ELECTRIC conductivity; SCATTERING (Physics); ELECTRONICS
- Publication
International Journal of RF & Microwave Computer-Aided Engineering, 2004, Vol 14, Issue 5, p433
- ISSN
1096-4290
- Publication type
Article
- DOI
10.1002/mmce.20030