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Caracterisation of liquid flows with method of parametrical wave phase conjugation

Abstract : The object of this work is the investigation of parametrically phase conjugate waves propagation in moving media and the demonstration of their possible applications for liquid flow velocimetry. The investigation of nonlinear effects accompanying the propagation and interaction of phase conjugate waves in moving media such as higher harmonics generation and Brillouin scattering is made. A possibility of application of these effects for precision improvement of conventional acoustic systems of flow velocimetry is considered. It is shown that the phase synchronization principle for cascade generation of higher harmonics is still valid in moving media which allows to improve the sensitivity of measurement proportionally to the number of used harmonic. It is also shown that the phase shift of Stokes component of differential frequency generated in moving media by Brillouin scattering of phase conjugate wave with the reference one corresponds to the one of the phase conjugate wave. The effects of higher harmonics generation and Brillouin scattering can be used simultaneously to improve the sensitivity and precision of liquid flow velocity measurements. The possible applications of wave phase conjugation effect to liquid flows velocimetry are presented. A method of simultaneous measurement of mixture relative concentrations and flow velocity is elaborated.
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Submitted on : Friday, November 23, 2012 - 9:53:30 AM
Last modification on : Friday, November 23, 2012 - 4:28:05 PM
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  • HAL Id : tel-00756462, version 1

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Nikolay Smagin. Caracterisation of liquid flows with method of parametrical wave phase conjugation. Acoustics [physics.class-ph]. Ecole Centrale de Lille, 2008. Russian. ⟨tel-00756462⟩

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