US Patent 7330120 Remote measurement of motion employing RFID

A system and method for making measurements using and RFID system includes a transceiver, a transponder and a sensor configured within the transponder. The transceiver is configured to send and receive radio frequency signals. The transponder is configured to receive radio frequency signals from the transceiver and to send radio frequency signals to the transceiver. The transponder includes a sensor. The transceiver is configured to send an activation signal to the transponder thereby enabling the first transponder sensor to make a vibration measurement and to hold the measurement.