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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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Proceedings ArticleDOI
18 Sep 2005
TL;DR: In this paper, the authors considered the possibility of transferring acoustic waves of a given wavelength between two parallel guides created in a phononic crystal and showed that the demultiplexing phenomenon is affected by varying the inner radius of the hollow cylinders.
Abstract: We study theoretically the possibility of transferring acoustic waves of a given wavelength between two parallel guides created in a phononic crystal. The structure considered in this work is composed of a periodic array of steel cylinders in water that displays an absolute bandgap. Within this gap, a full transmission band exists for propagation inside a straight wave guide. We show that by choosing an appropriate coupling structure between two parallel wave guides, one can transfer a particular acoustic wavelength from one guide to the other. The coupling element is composed of two hollow cylinders interacting with four other hollow cylinders located at each side of the wave guides. We discuss how the demultiplexing phenomenon is affected by varying the inner radius of the hollow cylinders. Keywords-component; acoustic waves; phononic crystal; demultiplexer

5 citations

Journal ArticleDOI
TL;DR: In this paper, multimoding effects have been experimentally observed in thin-fdm aluminum waveguides on lithium niobate using a laser probe, which may adversely effect efficiency and minimum achievable time.
Abstract: Multimoding effects have been experimentally observed in thin-fdm aluminum waveguides on lithium niobate using a laser probe. When the waveguide is used as a convolver, these effects add dispersion and may adversely effect efficiency and minimum achievable time

5 citations

Journal ArticleDOI
01 Dec 2007
TL;DR: In this article, a common-path interferometer was used to resolve both the induced amplitude and phase changes in a chromium film with a 1-kHz Ti:sapphire regenerative amplifier.
Abstract: We excite high-amplitude longitudinal coherent acoustic strain waves in a chromium film deposited on a thin sapphire slab, by 100-fs pulses from a 1-kHz Ti:sapphire regenerative amplifier. The bipolar strain pulse that is launched into the crystal, gradually transforms into a shock wave when attenuation by thermal phonons is weaker than the nonlinear action. We detect such shock waves at the opposite side of the slab by probing the reflection of a second chromium film in a standard reflection geometry, with a common-path interferometer to resolve both the induced amplitude and phase changes. We first discuss the interferometer and its standard performance. We then present the measurements on propagating shock waves, and analyze the results on a qualitative level.

5 citations

Patent
Abbas Rastegar1
25 Jun 2012
TL;DR: In this article, a steaming fluid flow utilizing acoustic waves is described, where the common flow direction is at an angle to a direction acoustic waves are generated, and the acoustic coupling lens(es), in directing the acoustic waves into the fluid, redirects the acoustic wave from the direction of acoustic wave generation.
Abstract: Systems and methods are provided facilitating a steaming fluid flow utilizing acoustic waves. A system includes an acoustic wave generator and an acoustic coupler associated with the acoustic wave generator and coupling acoustic waves generated by the acoustic wave generator into a fluid. The acoustic coupler includes one or more acoustic coupling lenses, which direct the acoustic waves into the fluid and facilitate, at least in part, a streaming fluid flow in a common direction. In an enhanced embodiment, the common flow direction is at an angle to a direction acoustic waves are generated, and the acoustic coupling lens(es), in directing the acoustic waves into the fluid, redirects the acoustic waves from the direction of acoustic wave generation. The acoustic wave generator generates the acoustic waves in the megahertz or gigahertz range, for example, with a frequency of 20 MHz or higher.

5 citations


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