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Acoustic interferometer

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


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TL;DR: A time-dependent three-dimensional acoustic scattering problem is considered and a new numerical method to compute the scattered acoustic field is proposed, which obtains thetime-dependent scattered field as a superposition of time-harmonic acoustic waves and computes the time- Harmonicoustic waves by a new "operator expansion method".
Abstract: A time-dependent three-dimensional acoustic scattering problem is considered. An incoming wave packet is scattered by a bounded, simply connected obstacle with locally Lipschitz boundary. The obstacle is assumed to have a constant boundary acoustic impedance. The limit cases of acoustically soft and acoustically hard obstacles are considered. The scattered acoustic field is the solution of an exterior problem for the wave equation. A new numerical method to compute the scattered acoustic field is proposed. This numerical method obtains the time-dependent scattered field as a superposition of time-harmonic acoustic waves and computes the time-harmonic acoustic waves by a new “operator expansion method.” That is, the time-harmonic acoustic waves are solutions of an exterior boundary value problem for the Helmholtz equation. The method used to compute the time-harmonic waves improves on the method proposed by Misici, Pacelli, and Zirilli [J. Acoust. Soc. Am. 103, 106–113 (1998)] and is based on a “perturbative series” of the type of the one proposed in the operator expansion method by Milder [J. Acoust. Soc. Am. 89, 529–541 (1991)]. Computationally, the method is highly parallelizable with respect to time and space variables. Some numerical experiments on test problems obtained with a parallel implementation of the numerical method proposed are shown and discussed from the numerical and the physical point of view. The website: http://www.econ.unian.it/recchioni/w1 shows four animations relative to the numerical experiments.

18 citations

Journal ArticleDOI
TL;DR: In this article, four experimentally measured properties of waves which propagate in a medium having a dispersion relation D(k,ω)=1-ω02/ω2+k02/k2=0 where ω0 and k0 are characteristics of the medium.
Abstract: Reviews four experimentally measured properties of waves which propagate in a medium having a dispersion relation D(k,ω)=1-ω02/ω2+k02/k2=0 where ω0 and k0 are characteristics of the medium. A transmission line, ion acoustic waves and electron plasma waves are examined and some similarity is found in their properties.

18 citations

Journal ArticleDOI
TL;DR: In this paper, a two-zone-plate common-path interferometer operating at a wavelength of 13 nm was used for interferometry with a laser-driven high-harmonic source.
Abstract: We report on interferometry using a two-zone-plate common-path interferometer operating at a wavelength of 13 nm. The interferometer was set up with a laser-driven high-harmonic source emitting radiation with the high degree of spatial and temporal coherence necessary for interferometry. The interferometer is suited for investigations of the coherence properties of the light source employed, as well as for simultaneous measurements of the real and imaginary part of the complex index of refraction in the 100 eV regime. This is demonstrated in a proof of principle experiment with a piece of Zr-foil as the phase-shifting and absorbing sample.

18 citations

Journal ArticleDOI

18 citations

Journal ArticleDOI
TL;DR: In this paper, it was shown that the sum of the forces due to acoustic radiation and hydrodynamic flow, when a beam of plane waves is incident upon an absorber, is independent of the absorption in the medium and (within considerable limits) of the distance between the acoustic source and the absorber.
Abstract: The hydrodynamic flow associated with acoustic waves in viscous fluids is usually regarded as a disturbing effect in measuring acoustic intensities by radiation pressure. It is shown, however, by a simple application of the hydrodynamic momentum theorem, that the sum of the forces due to acoustic radiation and to the hydrodynamic flow, when a beam of plane waves is incident upon an absorber, is independent of the absorption in the medium and (within considerable limits) of the distance between the acoustic source and the absorber, if certain conditions are observed. This makes it possible to measure, in a simple way, the intensity of an acoustic beam at the source by measuring the total force due to radiation and flow without knowledge of the absorption coefficient of the fluid and without the use of thin screening films, which are commonly applied in order to eliminate the flow.

18 citations


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Performance
Metrics
No. of papers in the topic in previous years
YearPapers
20223
20182
201722
201627
201529
201433