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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: In this article, the authors model the signal of a trapped interferometer using two short laser pulses, separated by time T, which act as a phase grating for the matter waves.
Abstract: Using a thermal gas, we model the signal of a trapped interferometer. This interferometer uses two short laser pulses, separated by time T, which act as a phase grating for the matter waves. Near time 2 T , there is an echo in the cloud’s density due to the Talbot-Lau effect. Our model uses the Wigner function approach and includes a weak residual harmonic trap. The analysis shows that the residual potential limits the interferometer’s visibility, shifts the echo time of the interferometer, and alters its time dependence. Loss of visibility can be mitigated by optimizing the initial trap frequency just before the interferometer cycle begins.
1 citations
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01 Jan 1970
1 citations
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TL;DR: In this paper, the effect of liquid on the propagation of sound in a thin pipe (capillary) has not yet been solved, but the authors theoretically seek a solution to this problem.
Abstract: In [2, 3], the effect of reducing the wave velocity was found for elastic rods made in the form of a thin strip or fiber and immersed in a liquid. A reduction of the velocity is observed only in thin samples with a thickness on the order of a hundred microns. The effect found is caused by the fact that the so-called boundary layer of a liquid vibrates together with the rod. The thickness of this layer depends on the vibration frequency and the density and viscosity of the liquid. When the sound velocity depends on the viscosity, the effect discovered is employed for the determination of the viscosity of liquids. An advantage of this method is its ability to provide high-rate measurements, which makes it possible to control the chemical reactions with a time-dependent viscosity that proceed in liquids. As a sensor, we used metallic strips and fibers with a diameter of approximately 0.1 mm [2, 3], which were immersed in the liquid under investigation. The use, for this purpose, of a thin capillary filled with the liquid presents a number of advantages, among them the possibility of operating with a very small quantity (specified by the capillary volume) of liquid. The problem of the effect of liquid on the propagation of sound in a thin pipe (capillary) has not yet been solved. The goal of this study is to theoretically seek a solution to this problem.
1 citations
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TL;DR: In this paper, the authors studied the temperature distribution in water for a kilowatt pulse with a duration of the order of a millisecond in terms of the beam parameters and the optical absorption coefficient of water.
Abstract: Acoustic waves in water may be produced by the absorption of infrared energy from a pulsed laser. The temperature distribution in water for a kilowatt pulse with a duration of the order of a millisecond can be described in terms of the beam parameters and the optical absorption coefficient of water. The expression for the temperature distribution has been solved numerically. The acoustic waves were studied by the use of hydrophones in an anechoic tank filled with tap water. Cylindrical waves with exponentially decreasing amplitudes with depth were produced by the absorption of laser radiation. The velocity of these waves was in close agreement with the velocity of acoustic waves in water.
1 citations