Autor: Tegowski, J. - Katalog OPAC zbiorów

Skocz do pozycji: 1.

Tytuł:: Nonlinear acoustical methods in the detection of gassy sediments in the gulf of Gdańsk
Autorzy:: Tęgowski, J.
Jakacki, J.
Klusek, Z.
Rudowski, S.
Powiązania:: https://bibliotekanauki.pl/articles/331810.pdf
Data publikacji:: 2003
Wydawca:: Polskie Towarzystwo Akustyczne
Tematy:: nonlinear acoustical methods
gulf of Gdańsk
acoustical signals
gas
Opis:: The application of nonlinear backscattering of acoustical signals in detection of gas bubbles in subsurface layer of sediment of the Gulf of Gdansk is presented. Gas bubbles concentration was estimated assuming that nonlinear scattering in soft sediments is similar as in water. Summary, difference and double harmonics generated only by gas bubbles were recorded and used for bubble density estimation. Comparisons of the concentrations received from different nonlinear components show generally agreement in calculated bubble density distributions, although values of densities acquired from almost identical volumes in a single transmission differ.
Źródło:: Hydroacoustics; 2003, 6; 151-158
1642-1817
Pojawia się w:: Hydroacoustics
Dostawca treści:: Biblioteka Nauki

Artykuł

Skocz do pozycji: 2.

Tytuł:: Modelling multistatic of target detection
Autorzy:: Klusek, Z.
Elminowicz, A.
Tęgowski, J.
Szczucka, J.
Dragan, A.
Powiązania:: https://bibliotekanauki.pl/articles/331565.pdf
Data publikacji:: 2008
Wydawca:: Polskie Towarzystwo Akustyczne
Tematy:: Gdansk Gulf
chirp signals
hydroacoustic
Opis:: The paper presents a numerical approach to modelling the detection of underwater targets with a bi- or multistatic active sonar systems in the shallow water areas using different waveform signals. The results of the numerical modelling of surface, bubble clouds and bottom reverberation for CW and using up and down time-varying instantaneous frequency of chirp signals are presented. Some suggestions are made on the basis of the development and practicality for the shallow sea modeling techniques and approaches to existing sonar models. The paper reports the literature of the model components required for active sonar modelling for different propagation conditions. Some examples of scattering of CW and chirp source signals at bubble clouds and corrugated surfaces, and coherence are given. Active propagation and the system performance are surveyed and modelled adaptable to the specific environmental condition of the shallow sea area of the Gdansk Gulf.
Źródło:: Hydroacoustics; 2008, 11; 131-138
1642-1817
Pojawia się w:: Hydroacoustics
Dostawca treści:: Biblioteka Nauki

Artykuł

Skocz do pozycji: 3.

Tytuł:: Acoustical techniques of underwater meadow monitoring in the Puck Buy (Southern Baltic Sea)
Autorzy:: Klusek, Z.
Gorska, N.
Tęgowski, J.
Groza, K.
Faghani, D.
Gajewski, L.
Nowak, J.
Kruk-Dowgiałło, L.
Opioła, R.
Powiązania:: https://bibliotekanauki.pl/articles/332109.pdf
Data publikacji:: 2003
Wydawca:: Polskie Towarzystwo Akustyczne
Tematy:: acoustic techniques
underwater meadows
Puck Bay
Baltic Sea
Opis:: The main motivation of this paper was to develop acoustical techniques to monitor underwater meadows. The data, collected with down-looking echo sounder, were used to develop method of bottom detection and tracking and measurement of vegetation canopy height in the Puck Bay. This method and its accuracy are discussed in details. The other possibilities of recognition between covered and uncovered bottom were also reviewed. The effectiveness of using side scan sonar in study vegetation spatial distribution is demonstrated.
Źródło:: Hydroacoustics; 2003, 6; 79-90
1642-1817
Pojawia się w:: Hydroacoustics
Dostawca treści:: Biblioteka Nauki

Artykuł

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