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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.


Papers
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Journal ArticleDOI
TL;DR: In this paper, an effective method for the excitation of ultrasonic waves in thin liquid films based on the pulsed heating of these films by an interference field of coherent radiation was made.
Abstract: An investigation was made of an effective method for the excitation of ultrasonic waves in thin liquid films based on the pulsed heating of these films by an interference field of coherent radiation. The perturbations induced in the medium were measured from the diffraction of a cw laser beam. It is shown that the optimal conditions for the generation of monochromatic sound packets are achieved for exciting radiation having a pulse duration considerably shorter than the period of the acoustic waves. A method of determining the velocity and attenuation of the sound is proposed and the importance of edge effects in the relaxation processes of the perturbations is studied.

3 citations

Journal ArticleDOI
TL;DR: In this article, it was demonstrated theoretically and experimentally that linear velocities of reflecting objects may be measured using a resonant ring interferometer with a low-frequency light source.
Abstract: It is demonstrated theoretically and experimentally that linear velocities of reflecting objects may be measured using a resonant ring interferometer with a low-frequency light source. The limiting sensitivity of this interferometer is estimated. It is shown that a resonant ring interferometer can be used to measure extremely low linear velocities corresponding to subhertz Doppler frequency shifts of light, which cannot be measured by conventional Doppler techniques based on direct measurements of the frequency difference between the initial and reflected waves.

3 citations

Patent
16 Apr 2015
TL;DR: In this article, a method to attenuate acoustic waves is described, which involves shifting the phases of a plurality of portions of the acoustic waves and merging the portions of acoustic waves after phase shifting.
Abstract: Apparatuses and methods to attenuate acoustic waves are provided. The method may include shifting the phases of a plurality of portions of the acoustic waves and merging the portions of the acoustic waves after phase shifting. Because, for example, the phases of the acoustic waves may be out-of-sync when being merged, the acoustic waves may be attenuated. A muffler incorporating the method of attenuating acoustic waves can include a plurality of acoustic paths, each of which may have different acoustic impedance and/or length. The acoustic paths may help the acoustic waves have out-of-sync phases after the acoustic waves passing through the acoustic paths, resulting in acoustic wave attenuation.

3 citations

Proceedings ArticleDOI
08 Oct 2002
TL;DR: In this article, the authors presented a method for generating a narrow beam such that the direction of radiation is variable using an annular array, where a sound source using this method has a clearance between each neighboring element of the array.
Abstract: We present a method for generating a narrow beam such that the direction of radiation is variable using an annular array. A sound source using this method has a clearance between each neighboring element of the array. These clearances are applied to decentring the array elements and the direction of radiated ultrasonic beam becomes controllable. The validity of this method is confirmed with numerical calculations, and it is shown that the beam radiated at a direction of 15 degrees from the perpendicular of the source plane still keeps the sharp profile. The sound source fabricated by this method has small, simple and planar structure, and it suggests the capability of a sound source based on this method developing into various acoustic devices.

3 citations


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