Autor: Martyanov, A. I. - Katalog OPAC zbiorów

Skocz do pozycji: 1.

Tytuł:: Feasibility of a nonlinear acoustic method for monitoring of bubbles and fishes
Autorzy:: Didenkulov, I. N.
Martyanov, A. I.
Selivanovsky, D. A.
Powiązania:: https://bibliotekanauki.pl/articles/331838.pdf
Data publikacji:: 1999
Wydawca:: Polskie Towarzystwo Akustyczne
Opis:: A problem of remote counting of bubbles and fishes in shallow waters is complicated due to strong reverberation. Traditional way to solve this problem is the use of narrow acoustic beams and short pulse signals, but it is not applicable for all the situations, in particular, in rivers. Reverberation can be suppressed by methods of nonlinear acoustics, since signals scattered by nonlinear targets contain frequencies which are different from primary emitted ones. Bubble-like objects (free bubbles or swimbladder fishes) have strong nonlinear responses. In the present paper a difference frequency method of counting of bubble-like objects is theoretically considered. Since such a nonlinear scattering is resonant bubble and fish sizing becomes possible. For moving targets nonlinear acoustic response exhibits a specific frequency shift, which can be used for velocity estimation.
Źródło:: Hydroacoustics; 1999, 2; 273-278
1642-1817
Pojawia się w:: Hydroacoustics
Dostawca treści:: Biblioteka Nauki

Artykuł

Skocz do pozycji: 2.

Tytuł:: Bubble diagnostics with the nonlinear acoustic scattering method
Autorzy:: Didenkulov, I. N.
Martyanov, A. I.
Selivanovsky, D. A.
Pronchatov-Rubtsov, N.V.
Powiązania:: https://bibliotekanauki.pl/articles/332477.pdf
Data publikacji:: 2001
Wydawca:: Polskie Towarzystwo Akustyczne
Opis:: The highly nonlinear response of a bubble to an acoustic excitation makes nonlinear methods possible for bubble observation and sizing. There are various nonlinear acoustic methods of bubble detection. The difference frequency method is described, with application to the bubble concentration measurements in the sea. The results of observations on bubble populations of different sizes with a nonlinear acoustic bubble counter are given. The bubble counter was put in the subsurface ocean layer from the drifting vessel. The unit detected single bubbles of known sizes when they passed through the working volume created by the intersection of high-frequency acoustic beams. Data on bubble concentration are presented and discussed. Experiments on bubble motion diagnostics in the cavitation water jet are also described.
Źródło:: Hydroacoustics; 2001, 4; 43-52
1642-1817
Pojawia się w:: Hydroacoustics
Dostawca treści:: Biblioteka Nauki

Artykuł

Skocz do pozycji: 3.

Tytuł:: Acoustic tomography of a turbulent water jet
Autorzy:: Gavrilenko, V.
Didenkulov, I.
Kustov, L.
Martyanov, A.
Nechayeva, M.
Vyugin, P.
Pronchatov-Rubtsov, N.
Powiązania:: https://bibliotekanauki.pl/articles/331748.pdf
Data publikacji:: 2003
Wydawca:: Polskie Towarzystwo Akustyczne
Tematy:: acoustic tomography
turbulent water
hydroacoustics
Opis:: 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.
Źródło:: Hydroacoustics; 2003, 6; 91-100
1642-1817
Pojawia się w:: Hydroacoustics
Dostawca treści:: Biblioteka Nauki

Artykuł

Skocz do pozycji: 4.

Tytuł:: The difference-frequency acoustic scattering from nonlinear objects
Autorzy:: Didenkulov, I.
Kustov, L.
Martyanov, A.
Vyugin, P.
Powiązania:: https://bibliotekanauki.pl/articles/332207.pdf
Data publikacji:: 2006
Wydawca:: Polskie Towarzystwo Akustyczne
Opis:: 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.
Źródło:: Hydroacoustics; 2006, 9; 31-38
1642-1817
Pojawia się w:: Hydroacoustics
Dostawca treści:: Biblioteka Nauki

Artykuł

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