scholarly journals Integrating microfluidics and biosensing on a single flexible acoustic device using hybrid modes

Lab on a Chip ◽  
2020 ◽  
Vol 20 (5) ◽  
pp. 1002-1011 ◽  
Author(s):  
Ran Tao ◽  
Julien Reboud ◽  
Hamdi Torun ◽  
Glen McHale ◽  
Linzi E. Dodd ◽  
...  
Keyword(s):  
Thin Film ◽  
Lamb Waves ◽  
Shear Waves ◽  
Hybrid Wave ◽  
Microfluidic Actuation ◽  
Acoustic Device ◽  
Thickness Shear ◽  
Wave Modes

A flexible thin film acoustofluidic device generates hybrid wave modes for microfluidic actuation (Lamb waves) and biosensing (thickness shear waves).

The Horizontally Polarized Shear Waves in Multilayered Piezo-Composites with 2-2 Connectivity

2004 ◽  
Vol 261-263 ◽  
pp. 465-470
Author(s):  
Zheng Hua Qian ◽  
Feng Jin ◽  
Zi Kun Wang ◽  
Kikuo Kishimoto
Keyword(s):  
Thin Film ◽  
Thin Films ◽  
Phase Velocity ◽  
Polymer Composites ◽  
Piezoelectric Ceramic ◽  
Shear Waves ◽  
Electrical Performance ◽  
Sh Waves ◽  
Structural Applications ◽  
Waves Propagation

Following the advances in structural applications, composite structures are being used commonly in transducer applications to improve acoustic, mechanical and electrical performance of piezoelectric devices. Functional composite transducers for sensors and actuators generally consist of ceramics and polymers, the disadvantage of the brittleness nature of the piezoelectric ceramics can be overcome and the structures especially good for sensing can be allowed for building up. Propagation behavior of horizontally polarized shear waves (SH-waves) in piezoelectric ceramic-polymer composites with 2-2 connectivity is taken into account. The multilayer structures are consisted of piezoelectric thin films bonded perfectly with polymeric thin films alternately. The phase velocity equations of SH-waves propagation in the piezoelectric ceramic-polymer composites with 2-2 connectivity are obtained for the cases of wave propagation in the direction perpendicular to the layering and along the layering, respectively. Filter effect of this kind of structure and the effect of volume fraction and shear modulus ratio of piezoelectric layer to polymer layer on the phase velocity are discussed in detail, respectively. One practical combination of piezoelectric thin film-polymer thin film multilayer system is chosen to carry out the numerical simulation, some basic properties of SH-waves propagation in above multilayered structures are revealed.

scholarly journals Spin-wave modes in transition from a thin film to a full magnonic crystal

2019 ◽  
Vol 99 (2) ◽  
Author(s):  
M. Langer ◽  
R. A. Gallardo ◽  
T. Schneider ◽  
S. Stienen ◽  
A. Roldán-Molina ◽  
...  
Keyword(s):  
Thin Film ◽  
Spin Wave ◽  
Magnonic Crystal ◽  
Wave Modes

Simulation of Lamb Wave Propagation Using Excitation Potentials

2017 ◽  
Author(s):  
Mohammad Faisal Haider ◽  
Victor Giurgiutiu ◽  
Bin Lin ◽  
Lingyu Yu
Keyword(s):  
Elastic Waves ◽  
Lamb Wave ◽  
Lamb Waves ◽  
Plate Thickness ◽  
Signal Amplitude ◽  
Pressure Potential ◽  
Theoretical Formulation ◽  
Damage Process ◽  
Plane Displacement ◽  
Wave Modes

Acoustic emission (AE) can be used to measure energy associated with inelastic deformation such as slip, twinning, and microcracking, etc. in a structure. By obtaining AE information during a damage process, the failure indication can be detected. Therefore, better understanding of AE from a damage process is essential for proper damage detection. Elastic waves emission from a damage process due to energy release can be generalized by excitation potentials. There are two types of potentials exists in a plate for straight crested Lamb waves: pressure potential and shear potential. Theoretical formulation showed that due to excitation potentials the elastic waves in a plate followed the Raleigh-Lamb wave equation. The total energy released from damage can be decomposed as pressure potential and shear potential. Each potential has contribution to different wave modes. A numerical simulation was conducted to identify different wave modes due to excitation potentials. Out of plane displacement was calculated numerically on top of the plate at 500 mm distance from excitation point in each of 2mm, 6mm and 12 mm thick stainless steel plate. There were large losses in peak signal amplitude of anti-symmetric fundamental mode (A0) with increasing plate thickness from 2mm to 12 mm.

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