Techno Press
Techno Press

Smart Structures and Systems   Volume 18, Number 6, December 2016, pages 1217-1231
DOI: http://dx.doi.org/10.12989/sss.2016.18.6.1217
 
Battery-free slotted patch antenna sensor for wireless strain and crack monitoring
Xiaohua Yi, Chunhee Cho, Yang Wang and Manos M. Tentzeris

 
Abstract     [Full Text]
    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.
 
Key Words
    antenna sensor; battery-free; crack sensing; strain sensing; RFID; slotted patch
 
Address
Xiaohua Yi, Chunhee Cho and Yang Wang: School of Civil and Environmental Engineering, Georgia Institute of Technology, Atlanta, GA 30332, USA
Manos M. Tentzeris: School of Electrical and Computer Engineering, Georgia Institute of Technology, Atlanta, GA 30332, USA
 

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