Microwave Imaging for Nondestructive Testing of Dielectric Structures: Numerical Simulations Using an Inexact Newton Technique

In this paper, a microwave imaging technique for nondestructive testing (NDT) of dielectric structures is presented. In the proposed approach, the nonlinear and highly ill-posed system of integral equations of the electromagnetic inverse scattering is solved by means of a regularizing inexact Newton technique using the truncated Landweber algorithm. The underlying theory is outlined and some numerical simulations are reported to assess the capabilities of the proposed technique in testing dielectric objects such as cement beams in noisy environments.