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The difference-frequency acoustic scattering from nonlinear objects

Didenkulov I., Kustov L., Martyanov A., Vyugin P.

Hydroacoustics

2006

Vol. 9

31-38

The difference-frequency acoustic scattering from nonlinear objects such as bubbles was studied for many years and used for bubble diagnostics. In the present paper we consider theoretically two problems. The first one is the difference-frequency scattering from the nonlinear layer in linearly stratified medium. The second problem is the difference frequency scattering from the system of periodic nonlinear layers. In both problems the resonance phenomena are studied and their influence on characteristics of the scattered fields are analyzed. In the third part of the paper we describe experimental method of acoustic difference-frequency vision of large-scale bubbly objects.

Acoustic tomography of a turbulent water jet

Gavrilenko V., Didenkulov I., Kustov L., Martyanov A., Nechayeva M., Vyugin P., Pronchatov-Rubtsov N.

Hydroacoustics

2003

Vol. 6

91--100

Measurement of parameters of flowing liquid is one of problems, which have many applications. in the present paper we describe linear and nonlinear acoustic tomography methods for reconstruction of parameters of a turbulent water jet with gas bubbles. Experiments on both techniques are described. in the linear acoustic method it was measured fluctuations of acoustic signal passed through the jet. In the nonlinear acoustic technique it was measured spectra of combination scattering signals in the jet. Experiments were done in a water tank with a submerged water jet. The results of the work demonstrate the possibility of the tomography of flowing bubble liquids.