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Communication Dans Un Congrès Année : 2010

Nonlinear Acoustics of Phase Conjugate ultrasound Waves

Résumé

In this presentation, the principles of nonlinear acoustics of phase conjugate ultrasound waves (PCW) and their applications for nonlinear imaging and flow diagnostics are reviewed. The theoretical basis for description of nonlinear propagation of PCW in inhomogeneous and moving media is presented. The advantages of the magnetoacoustic technique of narrow band selective phase conjugation for applications in harmonic imaging are demonstrated. Phase conjugation of acoustic harmonics generated during nonlinear propagation of testing ultrasound beams is applied for detection of isoechogenic objects and for compensation of phase distortions in high resolution nonlinear acoustic imaging. Applications of PCW for velocimetry of complex flows are shown on examples of instantaneous measurements of velocity and composition of mixed liquids, diagnostics of flows in real blood vessels “in vitro”, imaging of immersed jets and reconstruction of space distributions of flow velocity in liquid. The problems and some results of gas flow diagnostics by means of ultrasound wave phase conjugation are discussed. Références : [1] A.Brysev, L.Krutyansky, V.Preobrazhensky: Wave phase conjugation of ultrasound beams. Uspekhi Phys. Nauk (review of topical problems) 168 (1998) 877-890. [2] V.L.Preobrazhensky: Parametrically phase conjugate waves : applications in nonlinear acoustic imaging and diagnostics. Uspekhi Phys. Nauk (review of topical problems) 176 (2006) 98-102. [3] Yu. V. Pyl’nov, V.Preobrazhensky and P. Pernod: Detection of Moving Objects and Flows in Liquids by Ultrasonic Phase Conjugation. Acoustical Physics 51 (2005) 105–109. [4] L. Krutyanskiy, V. Preobrazhenskiy, P. Pernod, O. Bou Matar: Nonlinear imaging of isoecohenic phantoms using phase conjugation of the second acoustic harmonic. Physics of Wave Phenomena. Vol.15, N°3, pp.186-190, 2007 [5] S.V. Preobrazhensky, V.L.Preobrazhensky, P. Pernod, O. Bou Matar, “Testing for inhomogeneity of the nonlinear parameter in an acoustic medium by ultrasonic phase conjugation,” Acoust. Phys.,Vol.54(1), pp. 15-19, 2008
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hal-00549633 , version 1 (22-12-2010)

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  • HAL Id : hal-00549633 , version 1

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Vladimir Preobrazhensky, Philippe Pernod. Nonlinear Acoustics of Phase Conjugate ultrasound Waves. 10ème Congrès Français d'Acoustique, Apr 2010, Lyon, France. ⟨hal-00549633⟩
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