부산대학교 도서관

In this paper, we study the problem of time reversal imaging of a dielectric object embedded inside another dielectric cylinder. The forward problem is solved using numerical simulation of scattering from a cross section of a cylinder by COMSOL and the multistatic data matrix (MDM) is obtained. The background Green's function (DGF) is computed by that of a point source near an infinitely long dielectric cylinder and TR-DORT is evaluated using this background DGF. Results demonstrate that while using a homogeneous DGF for imaging yields erroneous results, employing this Green's function the scatterer inside the cylinder is correctly imaged. Furthermore, small variation in permittivity of embedded dielectric cylinder is detected by studying the largest eigenvalue of the MDM matrix.