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 Jul 2017
TL;DR: In this paper, a sensor based on surface and plate acoustic waves propagating in LiNbO3 crystal was developed to detect viscosity, electric conductivity, and temperature of one and the same micro-liter liquid sample.
Abstract: This work deals with developing the sensor capable to detect viscosity, electric conductivity, and temperature of one and the same micro-liter liquid sample. The sensor is based on surface and plate acoustic waves propagating in LiNbO3 crystal. Properties of the waves and parameter of the sensor are measured and presented.
26 Dec 2007
TL;DR: In this article, the authors presented an experimental evidence to correlate the acousto-optic effect of nematic liquid crystals to modal excitations of guided acoustic waves, and showed that homeotropically and homogeneously aligned liquid crystals can be affected by symmetric and antisymmetric modes, respectively.
Abstract: This paper presents an experimental evidence to correlate the acousto-optic effect of nematic liquid crystals to modal excitations of guided acoustic waves. The optic axes of liquid crystal molecules in a cell can be tilted by ultrasound at oblique incidence. The cell filled with homeotropically aligned liquid crystal material, 5CB, is fully immersed in a water tank situated between two crossed polarizers. Multi-modal guided acoustic waves have been excited in cell by changing the angle of incidence and driving frequency. The liquid crystal material sandwiched between two glass plates is regarded as a Newtonian fluid and modeled to be an isotropic hypothetical solid. The phase velocity dispersion curves and associated modal strains within the liquid crystal cell are determined numerically. Comparison between measured data and prediction reveals that guided acoustic waves have influence on the acousto-optic response of liquid crystals rather than bulk acoustic waves. Simulated results show that homeotropically and homogeneously aligned liquid crystals can be affected by symmetric and antisymmetric modes, respectively.
01 Jan 2014
TL;DR: In this article, the Raman instability model was used to model the interaction of an ultra-intense laser pulse and a plasma, which leads to the so-called Euler-Maxwell system.
Abstract: In this chapter, we go back to laser–plasma interaction by addressing the coupling of the laser waves with the electron plasma waves. So we derive the so-called Raman instability model. In the case of the fixed-ion assumption, it leads to a three-wave coupling system that shows the same structure as the system of Brillouin instability. In the second part of this chapter, we deal with the modelling of the interaction of an ultra-intense laser pulse and a plasma. This leads to the so-called Euler–Maxwell system. We give some mathematical properties of this system and we show how an envelope description may be useful in some cases.
TL;DR: In this article, a method for describing a moving film vortex structure and its interaction with surface acoustic waves is proposed, and it is shown that the moving vortex structure can amplify (generate) surface acoustic wave.
Abstract: A method is proposed for describing a moving film vortex structure and its interaction with surface acoustic waves. It is shown that the moving vortex structure can amplify (generate) surface acoustic waves. In contrast to a similar effect in semiconductor films, this effect can appear when the velocity of the vortex structure is much lower than the velocity of the surface acoustic waves. A unidirectional collective mode is shown to exist in the moving vortex structure. This mode gives rise to an acoustic analogue of the diode effect that is resonant in the velocity of the vortex structure. This acoustic effect is manifested as an anomalous attenuation of the surface acoustic waves in the direction of the vortex-structure motion and as the absence of this attenuation for the propagation in the opposite direction.
TL;DR: In this article, focused, high power modulated CO2 laser radiation by gaseous CO2 leads to pronounced non-linear acoustic wave generation by virtue of significant heating of the gas in the focal volume.