Time Domain Inverse Scattering of Buried Inhomogeneous Dielectric Cylinders

Abstract

This paper presents the studies of time domain inverse scattering for a two-dimensional inhomogeneous dielectric cylinder buried in a half-space by the finite difference time domain (FDTD) method and evolutionary algorithms (EAs). For forward scattering, the FDTD method is employed to calculate the scattered E fields, while for the inverse scattering the evolutionary algorithms are utilized to determine the permittivity of the buried cylindrical scatterer with arbitrary cross section. The results obtained for different examples show that the dynamic differential evolution (DDE) algorithms outperform the non-uniform steady state genetic algorithm (NU-SSGA) variants in terms of finding best optima. The suitability and efficiency of applying these two methods for microwave imaging of 2-D inhomogeneous dielectric cylinders are examined. Moreover, when the measured scattered fields are contaminated with Gaussian noise, DDE is able to yield good reconstructed quality.

Nondestructive Evaluation of Buried Dielectric Cylinders by Asynchronous Particle Swarm Optimization

“…In the last example, to test the problem of reference [33], we have conducted the following studies: a two dimensional inhomogeneous dielectric cylinder buried in half space and slab medium, respectively.…”

“…Recently, there are a few reports on this subject of 2-D object about inhomogeneous dielectric cylinder under time domain [32]- [34]. The reference [33] focuses on two-dimensional inhomogeneous dielectric cylinder buried in a half-space by using dynamic differential evolution (DDE) and non-uniform steady state genetic algorithm (NU-SSGA). To the best of our knowledge, there is still no investigation on using the APSO to reconstruct the electromagnetic imaging of inhomogeneous dielectric cylinders with arbitrary cross section in a three-layered slab medium under time domain.…”

Solving time domain microwave imaging for two-dimensional inhomogeneous dielectric cylinder

“…Recently, there are a few reports on this subject of two‐dimensional (2D) object about inhomogeneous dielectric cylinder under time domain . To the best of our knowledge, there is still no investigation on using the asynchronous particle swarm optimization (APSO) and DDE to reconstruct the electromagnetic imaging of inhomogeneous dielectric cylinders with arbitrary cross section in a three‐layered slab medium under time domain to comparative study.…”