Abstract
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.
Highlights
Structural health monitoring (SHM) enabling with wireless sensor networks (WSNs) is widely used for condition-based maintenance of large-scale infrastructure [1]
Since the sensing information is extracted from EM signature of antenna sensors through backscattering communication in the ultra-high frequency (UHF) radio frequency identification (RFID) band, the RFID sensing system is quite susceptible to interferences from wireless channel [14]
The defect influences the impedance of the antenna sensor, power transmission coefficient and the threshold power to activate the tag varies with crack growth
Summary
Structural health monitoring (SHM) enabling with wireless sensor networks (WSNs) is widely used for condition-based maintenance of large-scale infrastructure [1]. In the absence of power consumption from sensing component, the communication range of this type of sensor can reach up to ten meters This type of sensor can be used to monitor crack growth in large-scale infrastructures instead of other traditional technologies with wire and battery. Since the sensing information is extracted from EM signature of antenna sensors through backscattering communication in the UHF RFID band, the RFID sensing system is quite susceptible to interferences from wireless channel [14]. This scenario becomes worse for chipless RFID antenna sensors.
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