Multifrequency microwave tomography of absorbing inhomogeneities

A method of the near-field scanning coherent tomography has been developed for the microwave diagnostics of the 3D subsurface structure of the complex permittivity. This method uses data of 2D scanning over lateral co-ordinates above the ground surface with the dipole emitter-receiver system. Multifrequency measurements provide the depth sensitivity. The regularization algorithm based on the Tikhonov´s method of generalized discrepancy has been developed for Fredholm integral equations of the 1-st kind with complex-valued functions and applied for the solution of the corresponding inverse scattering problem. Results are presented for the tomography of 3D complex permittivity distribution originated by the melting ice sample buried in the sand.