Re-transmission Crack Sensor based on Re-configurable Series Ring Resonator

In this paper, a wireless crack sensor is proposed, which expands the detection coverage of EM resonator through the electrically controlling the switch on/off of series ring resonator. Simulations show that the sensor can discriminate sub-millimeter crack with an average crack depth detection sensitivity of 53.2 MHz/mm ² in the ultra-high frequency band. The proposed sensor may provide a paradigm for global monitoring of large-scale metal structures.