NONLINEAR ACOUSTIC TOMOGRAPHY OF BUBBLE CLOUDS

A method of nonlinear acoustic tomography is applied to measuring the space distribution of bubbles in a sea. The idea underlying the method consists in varying the velocity of propagation of a high-frequency s ounding wave in the bubble medium under action of a powerful pump puls e from an explosive source. The time shifts of the sounding wave are c alculated as functions of a nonlinear parameter and characteristics of the pump pulse. The relation between the cubic nonlinear parameter an d the concentration of gas bubbles is found.