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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04 May 2017TL;DR: In this paper, the inner surface of the housing wall is made in at least half of its entire area of a thermally insulating material, and an acoustic wave sensor is provided at least partially inside the housing and configured to detect acoustic waves.
Abstract: A device for detecting acoustic waves may include a housing having a housing wall with an inner surface, and an acoustic wave sensor provided at least partially inside the housing and configured to detect acoustic waves. The inner surface of the housing wall is made in at least half of its entire area of a thermally insulating material.
5 citations
TL;DR: In this paper, a new method to measure the acoustic impedance of a solid medium which presents only one plane surface is described, based on the resonance of the liquid coupling layer between the transducer and the medium investigated.
Abstract: Abstmcr-A new method to measure the acoustic impedance of a solid medium which presents only one plane surface is described. This method is based on the resonance of the liquid coupling layer between the transducer and the medium investigated. First, the resonance of the layer is studied, and from its relative amplitude the acoustic impedance of the medium can be deduced. Second, the influence of the lack of parallelism of the coupling layer is determined, and a model is proposed to explain the experimental results. From the observation of the resonance when the transducer is inclined, it is possible to adjust correctly the parallelism of the layer so the acoustic impedance of the medium can be obtained with an accuracy varying between 4 and 8 percent.
5 citations
27 Sep 2012
TL;DR: In this article, the authors reported the first direct measurement of sound speed in liquid water at temperatures up to 250°C and pressures up to 14 MPa, using a specialized measurement cell for sound speed measurements and determination of B/A as a function of temperature and pressure.
Abstract: This work reports, for the first time, the direct measurement of sound speed in liquid water at temperatures up to 250°C and pressures up to 14 MPa. These measurements enabled the determination of the acoustic nonlinearity parameter, B/A, an important property of liquids. From an applications perspective, B/A determines the efficiency of devices that are based on acoustic nonlinear mixing. The objective of the present work was to use a specialized measurement cell for sound speed measurements and the determination of B/A in liquid water as a function of temperature and pressure. Sound speed was measured using Swept Frequency Acoustic Interferometry, while B/A was determined from the derivatives of the sound speed with respect to pressure and temperature. B/A at ambient pressure and temperature was determined to be 4.8, in good agreement with literature values. At 250°C and 14 MPa, B/A was found to be roughly twice its ambient temperature value.
5 citations
TL;DR: In this paper, the rocking curves of neutron Bragg reflections from LiNbO3 crystals were measured with and without acoustic waves excited on their surfaces, and a qualitative interpretation based on the diffraction of distorted crystals was given.
Abstract: The rocking curves of neutron Bragg reflections from LiNbO3 crystals were measured with and without acoustic waves excited on their surfaces. Travelling waves and standing waves were excited on the LiNbO3 crystals, and symmetric Bragg-case diffractions of the (030) planes were used. Enhancement of the integrated intensity and increase in the peak height were observed. A qualitative interpretation based on the diffraction of distorted crystals is given.
5 citations
TL;DR: Giant quantum oscillations and large amplitude, low field resonances, of the electromagnetically generated acoustic shear waves in bismuth are observed at helium temperatures as discussed by the authors, which is the state of the art.
5 citations