The processes of propagation of phase conjugate ultrasound waves in stationary and moving random media containing micro-inclusions in the form of gas bubbles and solid spheres are studied experimentally and theoretically. Wave phase conjugation at frequency 10 MHz was implemented by the supercritical parametric method. The qualitative difference of the statistical properties of scattered and phase conjugate acoustic fields is established. In contrast with detected stochastic signals of the scattered waves the signals of the phase conjugate waves are regular and more informative for determination of concentrations and parameters of the scatterers. The theoretical model describing observed features of the coherent backscattering of phase conjugate waves is developed.
Joint International Laboratory LICS/LEMAC: 1)Wave research center of A.M. Prokhorov General Physics Institute RAS, 38 Vavilova str.,119991 Moscow, Russia 2)Institute of Electronics, Microelectronics and Nanotechnology (IEMN UMR CNRS 8520) PRES Lille North of France, ECLille, B.P. 48, 59651 Villeneuve d'Ascq Cedex, France
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