Sensing system based on multiple resonant electromagnetic cavities

A sensor for measuring parameters experienced by a structure, the sensor comprising:

• a) a body having an electromagnetic resonator for producing a wireless response signal in response to a wireless interrogation signal, the body being coupled to the structure to allow a selected parameter to alter the resonance properties of the electromagnetic resonator thereby altering the wireless response signal;
• and,
• b) at least two couplers coupled to the sensor, the couplers adapted to transfer the wireless interrogation signal from a first antenna into the electromagnetic resonator to measure separate select parameters, and to transfer the respective wireless response signals of the select parameters measured out of the electromagnetic cavity to the first antenna.

A sensor for measuring parameters experienced by a structure, the sensor comprising:

• a) a body having an electromagnetic resonator for producing a wireless response signal in response to a wireless interrogation signal, the body being coupled to the structure to allow a selected parameter to alter the resonance properties of the electromagnetic resonator thereby altering the response signal, the electromagnetic resonator of the sensor having at least two rods therewithin, each rod to form within the electromagnetic resonator a resonator system, so that the resonator system associated with a first rod has a resonant frequency substantially separated from the resonant frequency of a second resonator system associated with a second rod;
• and,
• b) a coupler coupled to the sensor, the coupler adapted to transfer the wireless interrogation signal from an antenna into the electromagnetic resonator to measure separate select parameters, and to transfer the respective wireless response signals of the select parameters measured out of the electromagnetic cavity to the same or a different antenna.