Hydroacoustical Underwater Array
Development of an Experimental Parametric Acoustical Array as a New Tool for Long-Range Ocean Monitoring
Tech Area / Field
- ENV-MIN/Monitoring and Instrumentation/Environment
8 Project completed
Senior Project Manager
Rudneva V Ya
Federal State Unitary enterprise “N. Andreyev Acoustics institute”, Russia, Moscow
- Southern Federal Unversity, Taganrog, Russia, Rostov reg., Taganrog
- Nansen Environmental and Remote Sensing Center, Norway, Bergen\nFoundation of research and technology/Institute of applied and computational mathematics, Greece, Heraklione
Project summaryProject is aimed at the development of a new technique for remote ocean monitoring.. The main objective of the project is To design and develop a full scale experimental model of the power parametric array for long distance ocean monitoring. The specific feature for such underwater array, opperating on the principals of nonlinear acoustics, is extremely sharp directivity (1o-3o angular resolution) for low frequency acoustical signals. The effective width of this directivity pattern is practically constant in a wide frequency range. Sounding signal is forming in the ocean environment, which is stimulated by intensity modulated high frequency power acoustical pump. As a result the end-fire parametric array is forming at the ocean environment, which excites sharp directional signal radiation at the modulation frequency. Such a low frequency signal, generated by parametrical means, will propagate in stratified ocean independently from the pump radiation. Due to nonresonance properties for low frequency signal generation, parametric array provides sounding signal transmission in extremely wide frequency band (2 octaves and more). Preliminary calculations and field experiments show the availability of parametric array application for the ocean soundings at the paths more then 1000 km long. There are no any remarkable side-lobes in the parametric array directivity pattern, which is useful for essential rejection of acoustical signal reverberation at both rough bottom and surface of the ocean. Contemporary convenient acoustical systems essentially yield to parametric array for that characteristic. The project implementation will enable to develop and to test principally new transmitting acoustical system for long-range ocean sounding at the principals of nonlinear acoustics. That acoustical system will differ the conventional ones relatively small dimension (sizes for transmitting aperture are approximately 1*3m2 ), broad frequency band for the sounding signal (50 Hz – 1000 Hz) and sharp directivity pattern (approx 2o- 3o) for the total frequency band. Such transmission properties provide the development of efficient systems for the ocean sounding with the sensitivity in order higher then for convenient system.
Program of this project supposes 5 Tasks implementation. It includes both theoretical and experimental research, computer simulation, design and development of a full-scale experimental model of the power parametric array, as well as experimental demonstration in the field of the main developed principals of multi-frequency remote acoustical monitoring.
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