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http://dx.doi.org/10.12989/sss.2016.18.6.1217

Battery-free slotted patch antenna sensor for wireless strain and crack monitoring  

Yi, Xiaohua (School of Civil and Environmental Engineering, Georgia Institute of Technology)
Cho, Chunhee (School of Civil and Environmental Engineering, Georgia Institute of Technology)
Wang, Yang (School of Civil and Environmental Engineering, Georgia Institute of Technology)
Tentzeris, Manos M. (School of Electrical and Computer Engineering, Georgia Institute of Technology)
Publication Information
Smart Structures and Systems / v.18, no.6, 2016 , pp. 1217-1231 More about this Journal
Abstract
In this research, a slotted patch antenna sensor is designed for wireless strain and crack sensing. An off-the-shelf RFID (radiofrequency identification) chip is adopted in the antenna sensor design for signal modulation. The operation power of the RFID chip is captured from wireless reader interrogation signal, so the sensor operation is completely battery-free (passive) and wireless. For strain and crack sensing of a structure, the antenna sensor is bonded on the structure surface like a regular strain gage. Since the antenna resonance frequency is directly related with antenna dimension, which deforms when strain occurs on the structural surface, the deformation/strain can be correlated with antenna resonance frequency shift measured by an RFID reader. The slotted patch antenna sensor performance is first evaluated through mechanics-electromagnetics coupled simulation. Extensive experiments are then conducted to validate the antenna sensor performance, including tensile and compressive strain sensing, wireless interrogation range, and fatigue crack sensing.
Keywords
antenna sensor; battery-free; crack sensing; strain sensing; RFID; slotted patch;
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Times Cited By KSCI : 1  (Citation Analysis)
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