Transient processes associated with gas bubble excitation by ultrasonic pulses are investigated based on the numerical solution to the Rayleigh-Plesset equation. The results are used to consider ultrasonic methods of gas bubble detection and sizing in liquids and biological tissues on the basis of linear and nonlinear bubble properties. The possibility of frequency separation of signals received from bubbles with different sizes in the case of their pulsed excitation is experimentally demonstrated.
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