Source Publication Title
INSPIRE-University Transportation Center Webinars
06 Mar 2019, 11:00 am
A battery-free antenna sensor can wirelessly measure strain on a structure. Bonded to the surface of a base structure, the antenna sensor deforms when the structure is under strain, causing the antenna’s electromagnetic resonance frequency to change. This resonance frequency change can be wirelessly interrogated and recorded by a reader through electromagnetic backscattering. A radio frequency identification (RFID) chip on the sensor harnesses a small amount of energy from the interrogation signal and responds to the reader. The resonance frequency change identified by the reader is then used to determine the strain applied on the structure. The latest antenna sensor prototype adopts a thermally stable substrate as demonstrated in outdoor tests. Considering nonlinear constitutive relations, multi-physics simulation is performed to more accurately model the behaviors of the antenna sensor. In both simulation and laboratory experiments, the antenna sensor is shown to be capable of wirelessly measuring small strain changes. Finally, an emulated crack testing of the antenna sensor is presented, demonstrating the capability of measuring crack growth in application settings.
Dr. Yang Wang is an Associate Professor in Civil and Environmental Engineering at the Georgia Institute of Technology, where he also holds an adjunct position in Electrical and Computer Engineering. Prior to joining Georgia Tech, Dr. Wang received a Ph.D. degree in Civil Engineering and an M.S. degree in Electrical Engineering at Stanford University in 2007. Dr. Wang’s research interests include structural health monitoring, wireless and mobile sensors, structural system identification, model updating, and decentralized structural control. He received an NSF Early Faculty Career Development (CAREER) Award in 2012 and a Young Investigator Award from the Air Force Office of Scientific Research (AFOSR) in 2013. Dr. Wang is the author and coauthor of over 120 journal and conference papers. He currently serves as an Associate Editor for the ASCE (American Society of Civil Engineers) Journal of Bridge Engineering and for the Structural Health Monitoring journal. Dr. Wang is an Associate Director and Principal Investigator of the INSPIRE University Transportation Center.
Wang, Yang, "Battery-Free Wireless Strain Measurement using an Antenna Sensor" (2019). INSPIRE Archived Webinars. 7.
Civil, Architectural and Environmental Engineering
INSPIRE - University Transportation Center
Video - Presentation
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