Radar investigation of masonry structures

摘要

For the investigation of the influence of structural features in masonry on the propagation of electromagnetic impulse emitted by radar, different physical models containing various brick materials were constructed. As structural defects, full and empty joints, layered structures and larger air voids were considered. Some of the simpler models were stored in a tank filled with distilled water or with salt solution containing 2 mass/100 of NaCl. Radar measurements were performed using the nominal 500 MHz, 900 MHz, 1GHz and 1.5 GHz antennas in reflection configuration. Horizontal and vertical traces were recorded in different polarisations of the electric field. In some cases, the results are presented as time slices visualising the position of defects.