Journal
SENSORS
Volume 18, Issue 7, Pages -Publisher
MDPI
DOI: 10.3390/s18072130
Keywords
antenna sensor; circular patch; crack characterization; ultra-high frequency (UHF); radio frequency identification (RFID); structural health monitoring (SHM)
Funding
- National Natural Science Foundation of China (NSFC) [61701120, 61574049]
- EPSRC [EP/J012343/1] Funding Source: UKRI
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An exponential increase in large-scale infrastructure facilitates the development of wireless passive sensors for permanent installation and in-service health monitoring. Due to their wireless, passive and cost-effective characteristics, ultra-high frequency (UHF) radio frequency identification (RFID) tag antenna based sensors are receiving increasing attention for structural health monitoring (SHM). This paper uses a circular patch antenna sensor with an open rectangular window for crack monitoring. The sensing mechanism is quantitatively studied in conjunction with a mode analysis, which can uncover the intrinsic principle for turning an antenna into a crack sensor. The robustness of the feature is examined when the variation of crack position associated with an aluminum sample and the antenna sensor is considered. The experimental results demonstrate a reasonable sensitivity and resolution for crack characterization.
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