Velocity dispersion of plate acoustic waves in a multidomain phononic superlattice

2010 ◽  
Vol 82 (1) ◽  
Author(s):  
I. V. Ostrovskii ◽  
A. B. Nadtochiy ◽  
V. A. Klymko
Keyword(s):  
Acoustic Waves ◽  
Velocity Dispersion ◽  
Plate Acoustic Waves

Motion of microscopic grains in a periodic potential of plate acoustic waves

2003 ◽  
Vol 15 (43) ◽  
pp. 7201-7211 ◽  
Author(s):  
A M Gorb ◽  
A B Nadtochii ◽  
O A Korotchenkov
Keyword(s):  
Acoustic Waves ◽  
Periodic Potential ◽  
Plate Acoustic Waves

scholarly journals Integrated piezoelectric plate acoustic waves transducers

2008 ◽  
Vol 44 (12) ◽  
pp. 776 ◽  
Author(s):  
K.-T. Wu ◽  
C.-K. Jen ◽  
M. Kobayashi
Keyword(s):  
Acoustic Waves ◽  
Piezoelectric Plate ◽  
Plate Acoustic Waves

Higher-order Lamb waves with quasi-zero surface displacement components on a GaAs piezoelectric plate

2021 ◽  
Author(s):  
Muhammad Hamidullah ◽  
Céline Elie-Caille ◽  
Therese Leblois
Keyword(s):  
Acoustic Waves ◽  
Lamb Waves ◽  
Surface Displacement ◽  
Displacement Component ◽  
Higher Order ◽  
Acoustic Energy ◽  
Bulk Acoustic Wave ◽  
Integrated Sensor ◽  
Total Displacement ◽  
Plate Acoustic Waves

Abstract Higher-order Lamb waves with quasi-zero surface displacement components are reported on (100)-cut GaAs propagating along the <110> direction where the total displacement at the surface of the plate is less than 10% of the maximum total displacement. The dispersion curves and the displacement component profiles show the reduction of total displacement at the surface of the plate starting when the phase velocities of the higher-order modes are crossing the shear bulk acoustic wave velocity to the value as low as 5%. Due to the concentration of acoustic energy inside the plate, the reported quasi-zero plate acoustic waves (QZ-PAW) further reduce the radiation of acoustic when the plate surface is in contact with liquid. The experimental results validate the occurrence of QZ-PAW with a reduction of viscous damping insertion loss compared to previously reported quasi-longitudinal Lamb waves (QL-LW). The results demonstrate the potential QZ-PAW mode for emerging applications such as dual-mode PAW sensors, PAW devices with integrated sensor and actuator, thin-film and ultra-high frequency (UHF) PAW sensors in highly viscous liquid media.

Noncontact determination of thin films conductance by SH0 plate acoustic waves

2014 ◽  
Vol 115 (4) ◽  
pp. 044504 ◽  
Author(s):  
I. E. Kuznetsova ◽  
B. D. Zaitsev ◽  
V. I. Anisimkin ◽  
A. A. Teplykh ◽  
A. M. Shikhabudinov ◽  
...  
Keyword(s):  
Thin Films ◽  
Acoustic Waves ◽  
Plate Acoustic Waves

Dynamic poroelasticity: A unified model with the squirt and the Biot mechanisms

Geophysics ◽  
1993 ◽  
Vol 58 (4) ◽  
pp. 524-533 ◽  
Author(s):  
Jack Dvorkin ◽  
Amos Nur
Keyword(s):  
Oil Recovery ◽  
Acoustic Waves ◽  
Velocity Dispersion ◽  
Viscous Friction ◽  
Coupled Processes ◽  
Flow Mechanism ◽  
Reservoir Properties ◽  
Flow Length ◽  
Fluid Properties ◽  
The Individual

The velocities and attenuation of seismic and acoustic waves in rocks with fluids are affected by the two most important modes of fluid/solid interaction: (1) the Biot mechanism where the fluid is forced to participate in the solid’s motion by viscous friction and inertial coupling, and (2) the squirt‐flow mechanism where the fluid is squeezed out of thin pores deformed by a passing wave. Traditionally, both modes have been modeled separately, with the Biot mechanism treated in a macroscopic framework, and the squirt flow examined at the individual pore level. We offer a model which treats both mechanisms as coupled processes and relates P‐velocity and attenuation to macroscopic parameters: the Biot poroelastic constants, porosity, permeability, fluid compressibility and viscosity, and a newly introduced microscale parameter—a characteristic squirt‐flow length. The latter is referred to as a fundamental rock property that can be determined experimentally. We show that the squirt‐flow mechanism dominates the Biot mechanism and is responsible for measured large velocity dispersion and attenuation values. The model directly relates P‐velocity and attenuation to measurable rock and fluid properties. Therefore, it allows one to realistically interpret velocity dispersion and/or attenuation in terms of fluid properties changes [e.g., viscosity during thermal enhanced oil recovery (EOR)], or to link seismic measurements to reservoir properties. As an example of the latter transformation, we relate permeability to attenuation and achieve good qualitative correlation with experimental data.

scholarly journals Theoretical and experimental revision of surface acoustic waves on the (100) plane of silicon

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Alexander Tarasenko ◽  
Radim Čtvrtlík ◽  
Radim Kudělka
Keyword(s):  
Experimental Data ◽  
Phase Velocity ◽  
Acoustic Waves ◽  
Basal Plane ◽  
Velocity Dispersion ◽  
Surface Acoustic Waves ◽  
Azimuthal Angle ◽  
Acoustic Method ◽  
Phase Velocities ◽  
Phase Velocity Dispersion

AbstractThe phase velocity dispersion of the surface acoustic waves on a basal plane of Si(100) has been calculated in the whole range of the azimuthal angle of propagation. We present a detailed description of the calculations. These calculations are compared with the experimental data obtained by a laser acoustic method. Our data convincingly demonstrate the existence of a gap in the spectrum of the phase velocities. The gap means that in a definite range of the phase velocities the SAWs are absent in the whole interval of the azimuthal angles. There is an excellent coincidence between the numerical and experimental data.

Analysis of Surface Acoustic Waves in Layered Piezoelectric Media and its Applications to the Design of Saw Devices

2003 ◽  
Vol 19 (1) ◽  
pp. 225-232 ◽  
Author(s):  
T.-T. Wu ◽  
Y.-Y. Chen
Keyword(s):  
Acoustic Waves ◽  
Velocity Dispersion ◽  
Metal Layer ◽  
Effective Permittivity ◽  
Surface Acoustic Waves ◽  
Frequency Bandwidth ◽  
Piezoelectric Media ◽  
Saw Devices ◽  
Phase Velocity Dispersion

ABSTRACTIn this paper, we utilized a Stroh based formulation for solving problems of surface waves in layered piezoelectric media, and then, applied it to analyze surface acoustic wave (SAW) devices. The determination of the optimal cut of a piezoelectric crystal and the choice of the best propagation of SAW devices were given. The dispersion induced by a thin metal layer on SAW propagation in a SAW device was analyzed and discussed. Finally, we applied the formulation to calculate the effective permittivity and phase velocity dispersion of a LiNbO3/Diamond layered SAW device. Both of the null frequency bandwidth and the insertion loss of the dispersive SAW device were obtained.

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