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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TL;DR: In this paper, the dependence of the polarization of acoustic waves propagating in an acoustooptic tellurium crystal to the propagation direction with respect to the crystal axes is discussed.
Abstract: For acoustic waves propagating in an acoustooptic tellurium crystal, the dependence of their polarization on the propagation direction with respect to the crystal axes is discussed. The characteristic features of waves propagating in the crystal are considered; these features manifest themselves in an excess of the phase velocity of shear acoustic modes over the velocity of longitudinal modes. The change in the wave type from quasi-longitudinal to quasi-transverse as a result of the variation in the propagation direction of ultrasound is investigated. It is shown that such a behavior of bulk acoustic waves is caused by the specific relation between the elastic moduli, which differs from the corresponding relations observed in other acoustooptic materials.
14 citations
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TL;DR: The Schlieren images prove this multi reflection within the acoustic waveguide, which confirms former considerations and calculations based on the receiver signal, and can be interpreted in a better manner.
Abstract: Recently, an acoustic waveguide sensor based on multiple mode conversion of surface acoustic waves at the solid—liquid interfaces has been introduced for the concentration measurement of binary and ternary mixtures, liquid level sensing, investigation of spatial inhomogenities or bubble detection. In this contribution the sound wave propagation within this acoustic waveguide sensor is visualized by Schlieren imaging for continuous and burst operation the first time. In the acoustic waveguide the antisymmetrical zero order Lamb wave mode is excited by a single phase transducer of 1 MHz on thin glass plates of 1 mm thickness. By contact to the investigated liquid Lamb waves propagating on the first plate emit pressure waves into the adjacent liquid, which excites Lamb waves on the second plate, what again causes pressure waves traveling inside the liquid back to the first plate and so on. The Schlieren images prove this multi reflection within the acoustic waveguide, which confirms former considerations and calculations based on the receiver signal. With this knowledge the sensor concepts with the acoustic waveguide sensor can be interpreted in a better manner.
13 citations
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26 Mar 1974TL;DR: In this article, a crystal of Tl3 AsS4 having parallel optical faces is used in acousto-optical systems, where sound waves are generated in the crystal by means of a transducer connected to an RF generator and light is directed through optical faces of the crystal where it interacts with the sound waves.
Abstract: A crystal of Tl3 AsS4 having parallel optical faces is used in acousto-optical systems. Sound waves are generated in the crystal by means of a transducer connected to an RF generator and light is directed through optical faces of the crystal where it interacts with the sound waves. The acousto-optical system may be in the form of a display device, a laser modulator, a tunable filter, or other devices. An acoustic delay line using a crystal of Tl3 AsS4 is also disclosed.
13 citations
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01 Jan 1983
13 citations
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TL;DR: In this article, a method using the impedance tube technique is presented, which can measure both liquid viscosity and intrinsic sound velocity with reasonable precision, using a cylindrical wave guide.
Abstract: The attenuation of the sound energy produced by a liquid contained in a cylindrical tube (wave guide) depends on the liquid’s viscosity, sound frequency, tube wall thickness, and tube material. By measuring the acoustic impedance of plane sound waves in a cylindrical wave guide, one can obtain the liquid’s viscosity. Impedance measurements can also provide sound velocity in the liquid medium as another important physical characteristic. In this study a method using the impedance tube technique is presented. This research details the instrument’s principles of operation along pertinent analytical equations and reports experimental results conducted using viscosity standard liquids. It is shown that the instrument can measure both liquid’s viscosity and intrinsic sound velocity with reasonable precision.
13 citations