Abstract
The generation and propagation of cracks are critical factors that affect the performance and life of large structures. Therefore, in order to minimize maintenance costs and ensure personal safety, it is necessary to monitor key structures. The sensor based on ultra-high frequency radio frequency identification (UHF RFID) antenna has the advantages of passive wireless, low cost, and great potential in the field of metallic structure health monitoring. In this paper, aimed at the key parts of a metallic structure, a dual-tag system is used for crack monitoring. In conjunction with mode analysis, the principles of the sensing tag and the coupling principles of the dual-tag are analyzed. Considering that the dual-tag is placed in different methods, the effect of mutual coupling on the sensing performance of the tag is studied. The results show that the frequency of the sensing tag can be tuned by adding the interference tag, and the dual-tag sensor system has reasonable sensitivity. The results also provide potential guidance for the optimal placement of multiple tags in the near-field region.
Highlights
It can be noticeably observed that the imaginary part crosses multiple color strips and the increasing amplitude of mutual impedance Z21 is obviously smaller than that of the dual-tag placed in parallel placement
This result is consistent with simulated mode analysis
The dual-tag system was used for crack monitoring
Summary
Publisher’s Note: MDPI stays neutral with regard to jurisdictional claims in published maps and institutional affiliations. Stefano Caizzzone [23] used two coupled tag antennas to achieve sub-mm resolution in crack detection by establishing the correlation between phase and crack width. This method was only sensitive to the cracks between both tag antennas making it limited in the in-situ monitoring. It is important to study the direction in which the tags are arranged and how the change of distance among tags affect the sensitivity and reliability of crack detection. The changing the direction which the tags of areUHF arranged how the change of distance among rules tags of mutual impedance arereliability studied, and the influence of frequency shift caused by affect the sensitivity and of crack detection.factors.
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