Measurement of Three-dimensional Temperature Distribution Inside Dielectric Objects Using Near-field Radiometry

Abstract

The performance of near-field microwave radiometry systems to measure non-invasively the temperature distribution inside dielectric objects is analyzed. A rigorous solution based on the Green's function theory and the fluctuation-dissipation theorem is pursued to determine the power received by an aperture antenna located at the near field of the object to be measured. Resolution properties of this measurement technique are considered to estimate its imaging capabilities. The performance of antennas located at different distances from the object to be measured are examined. It is shown that contacting type antennas are superior as far as imaging properties are considered. Numerical results are presented for several cases.