Three-Dimensional Dielectric Imaging with Microwave Frequency Sweeping. Phase 1.

摘要

The objective of the research is to develop a three-dimensional dielectric imaging technique by inverse Fourier transform of microwave scattering field in the Fraunhoffer zone. Since the Fraunhoffer field contains only two-dimensional information, retrieval of the third dimension is approached by the frequency of the probing radiation. To overcome the problem of dielectric relaxation with varying frequency, frequency is limited to some windows within which dielectric relaxation is negligible, or within which the dielectric relaxation may be parameterized by an a priori formula. The Phase 1 research includes a theoretical feasibility study and development of an imaging algorithm, a survey of dielectric data for selecting a suitable frequency band, analysis of the system parameters and the expected image resolution, and a computer simulation on imaging reconstruction. Results confirm that the frequency sweeping technique provides adequate data for imaging reconstruction and it is technically feasible to develop such an imaging system. They provide quantitative guidelines for the system specification.