Experimental results related with the movement of the position of pressureand intensity maxima along the axis of focused acoustic beams under increasingdriving voltages and its interpretation are presented. It is shown that in thenonlinear regime the points of the pressure and intensity maximum are separatedand move differently along the axis, contrary to the linear regime, where thesepoints coincide. The considered effects are particularly strong in the case oflow-Fresnel-number beams.
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