Calibration of microwave antenna for porous materials moisture evaluation using frequency domain analysis

Abstract

Abstract The article presents the possibility to use microwave contactless measuring system for evaluation of moisture of porous media, mainly building materials utilizing the frequency domain analysis. In the article the description of microwave sensing technique is presented and the methods of microwave data analysis described. In the second part of the manuscript, microwave readouts are presented and the apparent permittivity values estimated in the red brick samples depending on moisture. With the calculated data, calibration model is estimated and fitting quality evaluated. Using the achieved data and calculated values the potential of microwave sensing technique is evaluated and advantages and disadvantages presented.