Technical Papers and Presentations

Due to the increasing demand for hydrogen gas sensors for applications such as automation, transportation, or environmental monitoring, the need for sensitive and reliable sensors with a short response time is increasing. This paper presents an empirical model that studies the sensitivity of acoustic hydrogen gas sensors. A parametric study based on the variation of physical properties of sensitive layers was implemented using COMSOL Multiphysics®. Palladium is used as a sensitive layer because of its high ability to interact with hydrogen molecules. This model shows that the variation of frequency depends simultaneously on the physical and mechanical parameters variations of a sensitive layer. This study was performed considering acoustic delay lines operating in the ISM bands, at around 430 MHz and 920 MHz.