In this paper a technique based on microwave heating and IR thermography measurement for dielectric constant estimation is proposed. The effect of the propagating EM wave on the temperature distribution inside the sample under test is studied for short observations time. A model was derived and a suitable data reduction is accomplished. Preliminary results are presented and discussed for the pure water case.
"Dielectric constant measurements by IR thermography in microwave heating", Proc. SPIE 4710, Thermosense XXIV, (15 March 2002); doi: 10.1117/12.459607; https://doi.org/10.1117/12.459607