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Open AccessArticle

Perturbation Analysis of a Multiple Layer Guided Love Wave Sensor in a Viscoelastic Environment

1
Department of Mechanical Engineering, College of Engineering, University of South Florida, Tampa, FL 33610, USA
2
Center for Research and Education in Nanobioengineering, University of South Florida, Tampa, FL 33612, USA
3
Department of Internal Medicine and Pharmacy Graduate Programs, University of South Florida, Tampa, FL 33612, USA
4
Microfluidics and Acoustics Laboratory, College of Engineering, University of South Florida, Tampa, FL 33610, USA
5
James A Haley VA Hospital, Tampa, FL 33612, USA
6
Department of Electrical Engineering, University of South Florida, Tampa, FL 33610, USA
7
Department of Molecular Medicine, University of South Florida, Tampa, FL 33612, USA
*
Author to whom correspondence should be addressed.
Sensors 2019, 19(20), 4533; https://doi.org/10.3390/s19204533
Received: 4 September 2019 / Revised: 14 October 2019 / Accepted: 15 October 2019 / Published: 18 October 2019
(This article belongs to the Special Issue Advances in Surface Acoustic Wave Sensors)
Surface acoustic wave sensors have the advantage of fast response, low-cost, and wireless interfacing capability and they have been used in the medical analysis, material characterization, and other application fields that immerse the device under a liquid environment. The theoretical analysis of the single guided layer shear horizontal acoustic wave based on the perturbation theory has seen developments that span the past 20 years. However, multiple guided layer systems under a liquid environment have not been thoroughly analyzed by existing theoretical models. A dispersion equation previously derived from a system of three rigidly coupled elastic mass layers is extended and developed in this study with multiple guided layers to analyze how the liquid layer’s properties affect the device’s sensitivity. The combination of the multiple layers to optimize the sensitivity of an acoustic wave sensor is investigated in this study. The Maxwell model of viscoelasticity is applied to represent the liquid layer. A thorough analysis of the complex velocity due to the variations of the liquid layer’s properties and thickness is derived and discussed to optimize multilayer Surface acoustic wave (SAW) sensor design. Numerical simulation of the sensitivity with a liquid layer on top of two guided layers is investigated in this study as well. The parametric investigation was conducted by varying the thicknesses for the liquid layer and the guided layers. The effect of the liquid layer viscosity on the sensitivity of the design is also presented in this study. The two guided layer device can achieve higher sensitivity than the single guided layer counterpart in a liquid environment by optimizing the second guided layer thickness. This perturbation analysis is valuable for Love wave sensor optimization to detect the liquid biological samples and analytes. View Full-Text
Keywords: surface acoustic wave; love wave; guided layers; perturbation; ZnO surface acoustic wave; love wave; guided layers; perturbation; ZnO
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Wang, T.; Murphy, R.; Wang, J.; Mohapatra, S.S.; Mohapatra, S.; Guldiken, R. Perturbation Analysis of a Multiple Layer Guided Love Wave Sensor in a Viscoelastic Environment. Sensors 2019, 19, 4533.

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