13 April 2011 Temperature and stiffness correction of SAW devices for wireless strain sensing
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Abstract
Surface acoustic wave (SAW) devices are solid-state components in which a wave propagates along the surface of a piezoelectric material. Changes in strain or temperature cause shifts in the acoustic wave speed and/or the path length, enabling SAW devices to act as sensors. We present experimental studies on lithium niobate SAW devices acting as passively-powered devices. Sensitivity, reproducibility, and linearity are excellent when measuring strain at constant temperature, but the devices are also sensitive to temperature changes. We show experimental results of strain measurement incorporating temperature compensation.
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Irving J. Oppenheim, Nicola S. Carey, T.-L. Chin, Peng Zheng, David W. Greve, "Temperature and stiffness correction of SAW devices for wireless strain sensing", Proc. SPIE 7981, Sensors and Smart Structures Technologies for Civil, Mechanical, and Aerospace Systems 2011, 79811F (13 April 2011); doi: 10.1117/12.880176; https://doi.org/10.1117/12.880176
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