A comparative evaluation of patch resonators layouts for moisture measurement in historic masonry units
Monitoring water content in cultural heritage materials through non-invasive and easy-to-use TDR/TDT (time-domain reflectometry / time-domain transmission) measurement systems has the potential to enhance conservation/restoration activities. In this study, two different probes for TDR/TDT technology, Square Patch Resonator (SPR) and Split Ring Resonator (SRR), were compared. The two probes were tested on two different materials (leccese and gentile stone), each one of them at three different levels of water content.