scispace - formally typeset
Search or ask a question
Topic

Acoustic interferometer

About: Acoustic interferometer is a research topic. Over the lifetime, 1493 publications have been published within this topic receiving 19355 citations.


Papers
More filters
Journal ArticleDOI
TL;DR: In this paper, a numerical technique characterized by a unified approach for the analysis of different types of acoustic waves utilized in resonators in which a periodic metal grating is used for excitation and reflection of such waves is described.
Abstract: A numerical technique characterized by a unified approach for the analysis of different types of acoustic waves utilized in resonators in which a periodic metal grating is used for excitation and reflection of such waves is described. The combination of the Finite Element Method analysis of the electrode domain with the Spectral Domain Analysis (SDA) applied to the adjacent upper and lower semi-infinite regions, which may be multilayered and include air as a special case of a dielectric material, enables rigorous simulation of the admittance in resonators using surface acoustic waves, Love waves, plate modes including Lamb waves, Stonely waves, and other waves propagating along the interface between two media, and waves with transient structure between the mentioned types. The matrix formalism with improved convergence incorporated into SDA provides fast and robust simulation for multilayered structures with arbitrary thickness of each layer. The described technique is illustrated by a few examples of its application to various combinations of LiNbO3, isotropic silicon dioxide and silicon with a periodic array of Cu electrodes. The wave characteristics extracted from the admittance functions change continuously with the variation of the film and plate thicknesses over wide ranges, even when the wave nature changes. The transformation of the wave nature with the variation of the layer thicknesses is illustrated by diagrams and contour plots of the displacements calculated at resonant frequencies.

26 citations

Journal ArticleDOI
TL;DR: In this article, the authors investigate the internal waves that are produced in a stratified fluid having constant Brunt-Vaisala frequency by a cylinder which executes small vibrations at a lower frequency.
Abstract: The paper describes an investigation of the internal waves that are produced in a stratified fluid having constant Brunt—Vaisala frequency by a cylinder which executes small vibrations at a lower frequency. Explicit solutions are found for slender cylinders having arbitrary cross-sections. When the cross-sectional area of the cylinder varies with time it is found necessary in calculating the surface pressures and power output to take account of terms in the governing equations that are significant only at distances from the cylinder comparable to or larger than the scale height of the density variations. For this case a simple expression for the power output is obtained in terms of the rate of change of the cross-sectional area of the cylinder. When the vibrating cylinder is rigid its cross-sectional area is independent of time and then the expression for the power output is very similar to von Karman's expression for the drag of a body of revolution in supersonic flow. In both the above cases it is found that one quarter of the power is radiated in each of the four directions that are inclined at a particular angle to the horizontal.

26 citations

Journal ArticleDOI
TL;DR: In this paper, the initial propagating transient acoustic field in air generated by an impacted plate is visualized and the transient traveling flexural waves in the plate created by the impact are shown, simultaneously.
Abstract: The initial propagating transient acoustic field in air generated by an impacted plate is visualized. The transient traveling flexural waves in the plate created by the impact are shown, simultaneously. The experiments are performed using double pulsed holographic interferometry. It is shown that flexural waves in a plate act as a series of traveling acoustic sources. Since the flexural waves in the plate are dispersive the trace matched acoustical waves further away from the impact source propagate at a smaller angle relative to the plate than those closer to the impact. An observer situated close to the plate and away from the impact point will first receive high‐frequency components of the sound. A quantitative evaluation of the acoustic field also shows that if there is a transient increase in pressure on one side of the plate there will be a similar decrease on the other side.

26 citations

Journal ArticleDOI
TL;DR: In this paper, the authors used the synchronized particle image velocimetry (PIV) technique to measure the acoustic velocity fields at different phases over the excitation signal period and compared the experimental velocity fields for the quasi-nonlinear cases with the analytical results obtained from the time-harmonic solution of the wave equation.

26 citations

Journal ArticleDOI
TL;DR: In this paper, a model of sound radiation from an infinite plate with an absorptive facing is proposed and investigated theoretically from the viewpoint of acoustic power, in which the motion of the perforated board is made equal to that of the vibrating surface.

26 citations


Network Information
Related Topics (5)
Wave propagation
55K papers, 1.1M citations
76% related
Scattering
152.3K papers, 3M citations
72% related
Magnetic field
167.5K papers, 2.3M citations
71% related
Electron
111.1K papers, 2.1M citations
71% related
Magnetization
107.8K papers, 1.9M citations
70% related
Performance
Metrics
No. of papers in the topic in previous years
YearPapers
20223
20182
201722
201627
201529
201433