Topic
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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01 Jan 2005
1 citations
TL;DR: In this article, the scattering of an external acoustic wave in a two-phase system is considered and the coefficients of attenuation of the energy of acoustic waves have been computed for such a system.
Abstract: The scattering of an external acoustic wave in a two-phase system is considered. For such a system respective coefficients of attenuation of the energy of acoustic waves have been computed. It is predicted that in such substances a high absorption of sound and an increase of absorption cross-section in a certain range of pressures in the liquid phase is possible. The problem of the scattering of sound in a structure similar to paper, comprising a chaotic succession of fibers and free volumes, has also been examined. It is shown that the porosity is a major characteristic of such substance.
1 citations
TL;DR: In this paper, a phase grating was formed with variations in thickness and refractive index with a period of half the wavelength of surface acoustic waves, when a thin film was deposited on a substrate in which a standing surface wave was excited.
Abstract: It was found for the first time that a phase grating was formed with variations in thickness and refractive index with a period of half the wavelength of surface acoustic waves, when a thin film was deposited on a substrate in which a standing surface wave was excited. No such phenomenon has been reported before, and its application to optical elements is expected to be a new application of surface acoustic waves.
1 citations
Patent•
23 Jun 2004
TL;DR: In this paper, an acoustic interferometer is used to measure at a plurality of intermediate positions between transmitter and sample holder, an acoustic signal including a direct signal from the transmitter and a reflected signal from a sample; and the signal processing means are arranged: -to record the acoustic signal as a function of the intermediate position, -to separate the direct signal and the reflected signals from the measured signals at each intermediate position by end-fire beampattem processing, and -to determine the acoustic reflection coefficient from an amplitude ratio of the separated reflected signal over the separated direct signal
Abstract: Arrangement for determination of an acoustic reflection coefficient of a sample by an acoustic interferometer, the interferometer including a tube, a sample holder, a transmitter, at least one receiver and signal processing means, the sample holder and the transmitter located inside the tube. In this arrangement the receiver is arranged to measure at a plurality of intermediate positions between transmitter and sample holder, an acoustic signal including a direct signal from the transmitter and a reflected signal from the sample; and the signal processing means are arranged: -to record the acoustic signal as a function of the intermediate position, -to separate the direct signal and the reflected signal from the measured signals at each intermediate position by endfire beampattem processing, and -to determine the acoustic reflection coefficient from an amplitude ratio of the separated reflected signal over the separated direct signal.
1 citations
1 citations