Abstract
The results of experimental studies of the effect of initial aperture of intense acoustic beams at a frequency of 3 MHz on the frequency and spatio‐temporal parameters of nonlinear acoustic waves propagated in pure degassed water are presented. The experiments were carried out in weakly diverging acoustic waves generated by piston‐like piezo‐ceramic radiators. A wideband miniature calibrated MHA9 receiver by Force Technology, capable of correctly analyzing over 20 harmonics of the received acoustic signal, was used in the experiments. The influence of initial aperture of the beam is studied on the spatial distributions of higher‐harmonic amplitudes in nonlinear waves formed at moderate values of the Reynolds number Re. The received‐signal profiles as functions of the reception point in the acoustic beam are analyzed for various relationships between the nonlinear and diffraction effects.
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