Innovative surface acoustic wave devices: a solution for real time monitoring and self-cleaning cascade impactor

FE. Dbibih, G. Fawaz, M. Vanotti, V. Soumann, V. Blondeau-Patissier

Abstract

This paper presents a comparative study of three types of surface acoustic waves sensors (SAW) used for particulate matter (PM) detection.<br />These sensors are placed in a cascade impactor as impaction plates. Monitoring their phase variation allows us to know the quantity of fine particles present in the environment with high accuracy. Until now, the sensors used in our prototype are built on quartz substrate and present a good sensitivity to fine particles. One major concern in our application is the fouling of the sensor’s surface with particles upon long periods of exposure. This shaped our drive to develop a self- cleaning sensor relying on other substrates with a stronger electromechanical coupling coefficient (K²). Hence, the aim of this study is to demonstrate the possibility of using strongly coupled piezoelectric substrates for an accurate PM detection as well as a self-cleaning process.

Keywords

Cascade impactor; SAW sensors; Lithium Niobate; Quartz; Particulate matter; PM10; PM2.5

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IMEKO-TC19-2022-01.pdf

DOI

10.21014/tc19-2022.01

IMEKO TC

TC19 - Environmental Measurements

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