Wireless system for passive surface acoustic wave sensors.

Abstract

With the advancement in the development of connected devices and the Internet of Things (IoT), continuous monitoring of physical and chemical parameters has become a current challenge for our society. Additionally, surface acoustic wave (SAW) devices, widely used as ilters in telecommunications, now serve the function of sensors. It is within these two contexts that the work of this thesis is situated. The goal is to develop a wireless reading system using one of these sensors, particularly the Love Wave (LW) sensor with recognized sensitivity in liquid media. Few studies involve this device by performing a remote reading, and exclusively using its acoustic response. In this thesis, we employ a more general approach considering its electromagnetic response and a speciic measurement and data acquisition protocol for detecting saline solutions on its surface. Given its passive nature, a wireless reading system is demonstrated, as well as discussion on its key characteristics, advantages, disadvantages, and limitations.