Series Expansion of Polarization Currents for Imaging of Large Dielectric Cylinders

Abstract

For the reconstruction of a large and high-contrast two-dimensional dielectric object, an inversion algorithm is proposed where the polarisation current inside the object is expanded in terms of Fourier series in the angular direction and eigenfunctions with orthogonality and completeness relations in the radical direction. By using this algorithm and a hybrid optimization algorithm combining the genetic algorithm and the Levenberg-Marquardt algorithm, circular dielectric cylinders of a diameter of four wavelengths are reconstructed with multiple incidences of plane waves in the presence of 20% Gaussian noise in the scattered fields. (C) 2000 John Wiley & Sons, Inc.