Wireless Displacement Sensing Enabled by Metamaterial Probes for Remote Structural Health Monitoring
Puttlitz, C. M.
Erturk, V. B.
Demir, H. V.
Multidisciplinary Digital Publishing Institute
Ozbey, B., Unal, E., Ertugrul, H., Kurc, O., Puttlitz, C. M., Erturk, V. B., ... & Demir, H. V. (2014). Wireless Displacement Sensing Enabled by Metamaterial probes for remote structural health monitoring. Sensors, 14(1), 1691-1704.
Please cite this item using this persistent URLhttp://hdl.handle.net/11693/11087
We propose and demonstrate a wireless, passive, metamaterial-based sensor that allows for remotely monitoring submicron displacements over millimeter ranges. The sensor comprises a probe made of multiple nested split ring resonators (NSRRs) in a double-comb architecture coupled to an external antenna in its near-field. In operation, the sensor detects displacement of a structure onto which the NSRR probe is attached by telemetrically tracking the shift in its local frequency peaks. Owing to the NSRR's near-field excitation response, which is highly sensitive to the displaced comb-teeth over a wide separation, the wireless sensing system exhibits a relatively high resolution (<1 mu m) and a large dynamic range (over 7 mm), along with high levels of linearity (R-2 > 0.99 over 5 mm) and sensitivity (>12.7 MHz/mm in the 1-3 mm range). The sensor is also shown to be working in the linear region in a scenario where it is attached to a standard structural reinforcing bar. Because of its wireless and passive nature, together with its low cost, the proposed system enabled by the metamaterial probes holds a great promise for applications in remote structural health monitoring.