Abstract: 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 µm) and a large dynamic range (over 7 mm), along with high levels of linearity (R2 > 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.
Keywords: displacement sensor; metamaterial; structural health monitoring
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Ozbey, B.; Unal, E.; Ertugrul, H.; Kurc, O.; Puttlitz, C.M.; Erturk, V.B.; Altintas, A.; Demir, H.V. Wireless Displacement Sensing Enabled by Metamaterial Probes for Remote Structural Health Monitoring. Sensors 2014, 14, 1691-1704.
Ozbey B, Unal E, Ertugrul H, Kurc O, Puttlitz CM, Erturk VB, Altintas A, Demir HV. Wireless Displacement Sensing Enabled by Metamaterial Probes for Remote Structural Health Monitoring. Sensors. 2014; 14(1):1691-1704.
Ozbey, Burak; Unal, Emre; Ertugrul, Hatice; Kurc, Ozgur; Puttlitz, Christian M.; Erturk, Vakur B.; Altintas, Ayhan; Demir, Hilmi V. 2014. "Wireless Displacement Sensing Enabled by Metamaterial Probes for Remote Structural Health Monitoring." Sensors 14, no. 1: 1691-1704.