Multiphysics Modeling of Printed Surface Acoustic Wave Thermometer
Surface acoustic wave (SAW) devices consisting of interdigitated transducers printed on piezoelectric substrates have resulted in low-cost, low-power, and small-footprint thermometers for high temperature and radioactive environments. This study developed temperature-dependent finite element models in both time- and frequencydomain. Modeling accuracy was evaluated using an aerosol-jet printed SAW thermometer measured from room temperature to 200 Celsius. Time-domain simulation results enabled acoustic wave propagation visualization and successfully guided the signal denoising of measured scattering parameters. Frequency-domain simulation accurately predicted the temperature-driven natural frequency drift in SAW transducers while maintaining high computational efficiency. The models developed in this study will facilitate computer-aided design of future SAW transducers and expand their applications in harsh environments.
Draper, Alejandro and Deng, Zhangxian. (2022). "Multiphysics Modeling of Printed Surface Acoustic Wave Thermometer". In Proceedings of SPIE (Sensors and Smart Structures Technologies for Civil, Mechanical, and Aerospace Systems series, Volume 12046, no. 1204608). SPIE: Society of Photo-Optical Instrumentation Engineers. https://doi.org/10.1117/12.2613141