J. Phys. IV France 02 (1992) C1-895-C1-898
EMITTING OF PHASE CONJUGATE ULTRASOUND WAVE INTO LIQUID BY PARAMETRICALLY EXCITED FERRITEA.P. BRYSEV1, F.V. BUNKIN1, L.M. KRUTIANSKY2, V.L. PREOBRAZHENSKII2, Yu.V. PYL'NOV2 and A.D. STACHOVSKY1
1 General Physics Institute, Russian Academy of Sciences, 38 Vavilov st., Moscow 117942, USSR
2 MoscowInstitute of Radio Engineering Electronics and Automation, 78 Vernadskogo pr., Moscow 117454, USSR
Phase conjugate sound waves at 6 MHz generated by polycrystalline ferrite sample at conditions of parametric magnetic field pumping over the threshold of absolute instability were studied in liquid. Conforming images of phase fronts for incident and conjugate waves were obtained. An angular anisotropy of effectivity connected with sample geometry was discovered and a method for it smoothing out is proposed. Maximum gain of acoustic wave in water was 43 dB ( 60 dB in ferrite ).
© EDP Sciences 1992