This road bed moisture sensor was developed for our partner, Bridge Preservation, to monitor bridge decks for moisture ingress. The sensor antenna is designed to be mounted on a bridge deck or on top of a 6×6 inch grid of rebar. A UHF EPC RFID reader can read this battery-free sensor through several inches of asphalt or concrete – even when wet. The sensor reports a “Wet” or “Dry” reading, along with the temperature.
This sensor can be adapted for many other types of battery-free wireless embedded road bed sensing.