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	Provedor de dados ArchiMer (4) Autor Auffret, J (1) D'Ozouville, L (1) Hammerstad, E (1) Kervern, G (1) Legall, A (1) Monsaingeon, L (1) Pohner, F (1) Mais... Palavra-chave Sonar imagery (4) Imaging techniques (2) Marine technology (2) Side scan sonar (2) Acoustics (1) Bathymetry (1) Detection (1) Echosounders (1) Echosounding (1) Instruments (1) Lasers (1) Multibeam sonar (1) Ocean floor (1) Optics (1) Sediment composition (1) Sediment distribution (1) Sediment dynamics (1) Signal processing (1) Sonar (1) Underwater cameras (1) Mais... Tipo do documento Text (4) Ano 1990 (3) 1985 (1) País France (4) Idioma Francês (2) Inglês (2)		Ordenar por:  Relevância Autor Título Ano Registros recuperados: 4 Primeira ... 1 ... Última Application du laser a la detection sous-marine: Experimentation d'un imageur ArchiMer Kervern, G; Legall, A. Nowadays, side-looking sonar is the only equipment able to carry out long-range underwater imaging. The use of optics is limited to short-range identification by means of conventional video-cameras. However, active optical systems (lidars) manufacturing, using a blue-green laser, will enable optics to hold its place in the field of long-range underwater imaging. After a short comparison between acoustics and optics in underwater detection and a description of the proper features of underwater optical propagation, we present the different conceivable imaging principles and propose a method to determine their performances. The experimentations described concern a lidar imager mock-up using one of the imaging principles proposed. The pictures obtained deal... Tipo: Text Palavras-chave: Optics; Lasers; Detection; Acoustics; Underwater cameras; Sonar imagery; Imaging techniques; Underwater photography; Marine technology; Side scan sonar. Ano: 1990 URL: http://archimer.ifremer.fr/doc/1990/acte-1139.pdf Apports de l''imagerie fournie par le sonar a balayage lateral a la connaissance de la dynamique sedimentaire en Baie de Seine ArchiMer Auffret, J; D'Ozouville, L. Continous process recording of lateral scanning sonar allows the observation of bottom sediments repartition contrasts. Their heterogeneity and evolution, the nature of contacts between different sediment deposits can be studied by this instrument, which completes the different techniques used for the sediment dynamics study. Tipo: Text Palavras-chave: Sediment composition; Sediment distribution; Sonar imagery; Sediment dynamics; Sonar. Ano: 1985 URL: http://archimer.ifremer.fr/doc/1985/acte-1284.pdf Hypson 400, a real time panoramic sonar. ArchiMer Monsaingeon, L. The search for a panoramic, real-time, high frequency sonar has been a major goal for operating ranges where optical systems have established limitations. HYPSON 400 meets such requirements and provides a simultaneous and continuous beam-forming, no-scanning, wide opening system, using a hybrid beam-forming technique allowed by new component technologies. Up to seven images per second can be formed at a range of 100 meters, and more at shorter distances, as allowed by the speed of sound, thus providing the highest possible rate of information renewal required by operations at sea. Tipo: Text Palavras-chave: Instruments; Sonar imagery; Marine technology. Ano: 1990 URL: http://archimer.ifremer.fr/doc/1990/acte-1156.pdf Ultra Wide Swath Sea interferometric multibeam echo sounder with sea bottom imaging system. ArchiMer Hammerstad, E; Pohner, F. The SIMRAD EM12 is a new full ocean depth multibeam echo sounder, operating at 13 kHz. By use of interferometric signal processing techniques it will achieve an ultra wide swath geometry of 150 degrees, corresponding to 7.5 times the depth of water. The system will in addition to the bathymetry produce a fully corrected sidescan sonar image of the seafloor, on to the depth soundings, the EM12 has the capability to generate a sidescan image of the seabed. Tipo: Text Palavras-chave: Ocean floor; Multibeam sonar; Bathymetry; Signal processing; Sonar imagery; Imaging techniques; Side scan sonar; Echosounding; Echosounders. Ano: 1990 URL: http://archimer.ifremer.fr/doc/1990/acte-1141.pdf Registros recuperados: 4 Primeira ... 1 ... Última

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