Nonlinear effects are investigating on high-intensity focused beam reflection from acoustically soft boundary. Experimental setup is used based on Ultrasound Measurement System Control Centre (Precision Acoustics). Fibre-optic Hydrophone System (Precision Acoustics) is applied for acoustic field registration in broad frequency and dynamic range. Radiator Olympus with focal distance 16cm is used for radiating signals with carrier frequency 1MHz. As a model for acoustically soft boundary water – air interface is used. Basic characteristics of focused acoustic beams reflection are studied. It is shown that transformation of wave front in reflected beam is determined by relative position reflected boundary and focal area of focusing radiator. Coincidence reflected boundary and focal plane of focusing radiator gives noticeable increase in acoustic intensity of reflected acoustic beam in comparison with the case of focusing in “infinite medium”.
$^1$Federal State Budgetary Scientific Institution "Federal Research Center The Institute of Applied Physics of the Russian Academy of Sciences" (IAP RAS)\
$^2$N.I. Lobachevsky Nizhny Novgorod State University
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