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Sensors 2017, 17(6), 1209;

Amorphous SiC/c-ZnO-Based Quasi-Lamb Mode Sensor for Liquid Environments

Institute of Photonics and Nanotechnologies, IFN-CNR, Via Cineto Romano 42, 00156 Rome, Italy
Research Center in Industrial Technologies CRTI, ex-CSC, P.O. Box 64, Cheraga, 16014 Algiers, Algeria
Author to whom correspondence should be addressed.
Academic Editors: Stefano Mariani, Francesco Ciucci, Dirk Lehmhus, Thomas Messervey, Alberto Vallan and Stefan Bosse
Received: 1 April 2017 / Revised: 15 May 2017 / Accepted: 23 May 2017 / Published: 25 May 2017
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The propagation of the quasi-Lamb modes along a-SiC/ZnO thin composite plates was modeled and analysed with the aim to design a sensor able to detect the changes in parameters of a liquid environment, such as added mass and viscosity changes. The modes propagation was modeled by numerically solving the system of coupled electro-mechanical field equations in three media. The mode shape, the power flow, the phase velocity, and the electroacoustic coupling efficiency (K2) of the modes were calculated, specifically addressing the design of enhanced-coupling, microwave frequency sensors for applications in probing the solid/liquid interface. Three modes were identified that have predominant longitudinal polarization, high phase velocity, and quite good K2: the fundamental quasi symmetric mode (qS0) and two higher order quasi-longitudinal modes (qL1 and qL2) with a dominantly longitudinal displacement component in one plate side. The velocity and attenuation of these modes were calculated for different liquid viscosities and added mass, and the gravimetric and viscosity sensitivities of both the phase velocity and attenuation were theoretically calculated. The present study highlights the feasibility of the a-SiC/ZnO acoustic waveguides for the development of high-frequency, integrated-circuit compatible electroacoustic devices suitable for working in a liquid environment. View Full-Text
Keywords: Lamb modes; amorphous SiC; ZnO; coupling configurations; sensors; viscous liquids Lamb modes; amorphous SiC; ZnO; coupling configurations; sensors; viscous liquids

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Caliendo, C.; Hamidullah, M.; Laidoudi, F. Amorphous SiC/c-ZnO-Based Quasi-Lamb Mode Sensor for Liquid Environments. Sensors 2017, 17, 1209.

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