Abstract

Acoustic Vision with the Nonlinear Scattered Fields

N.Pronchatov-Rubtsov, A.I.Martyanov, L.M.Kustov, P.N.Vyugin (Nizhny Novgorod State University, Nizhny Novgorod, Russia); I.N.Didenkulov (Institute of Applied Physics RAS, Nizhny Novgorod, Russia)

e-mail: nikvas@rf.unn.runnet.ru

It is known that some of objects have strongly nonlinear acoustic responses. Among such objects are gas bubbles in a fluid or cracks in a solid. Different nonlinear acoustic methods have been developed for diagnostics of such acoustically nonlinear objects. Those methods allow one mainly to detect acoustically nonlinear inhomogeneities. However for the case when size of an object is large compared to the wavelength one may suggest methods of nonlinear acoustic imaging of such objects. This paper describes a method of acoustic vision based on the use of combination acoustic scattering. Experiments were done with bubble objects in water. It was shown experimentally that the use of the difference-frequency scattering for acoustic vision is more effective compared to the linear method due to much less reverberation and due to higher sensitivity. This work was supported by the RFBR grants 01-02-17653 and 01-02-16938.

Section : 4