Pulse and multifrequency near-field subsurface diagnostics

In this paper, last results of theoretical and experimental studies of the near-field non-invasive diagnostics of subsurface dielectric inhomogeneities are presented. New methods of this diagnostics based on the sounding with pulse signals is proposed and demonstrated. Like in the multifrequency method, measurements of the scattered signal are in use to solve corresponding inverse scattering problems. Solving algorithms for sounding of various kinds of inhomogeneities: profiling of one-dimensional inhomogeneities, tomography of 3D distributed inhomogeneities, or computer holography of the shape of solid subsurface targets are proposed. The study includes the comparison of the pulse method with the early-developed multifrequency diagnostics.