ULTRASONIC SELF-FOCUSING AND SELF-TRANSPARENCY IN THE LIQUID

Process of thermal self -action of powerful ultrasonic signals in visc ous liquids are theoretically and experimentally investigated. Simulta neous realization of acoustic beam self-focusing and sound induced sel f-transparency of liquid gives a new nonlinear effect of high energy w ave packet self-concentration. A pulse with duration DELTAt approximat ely 10s is formed inside the liquid, the intensity of ultrasound in it s peak is several times greater than the input level. The parameters o f this process are calculated, which axe in a good agreement with expe rimental data.