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	Provedor de dados ArchiMer (2) Autor Kervern, G (1) Legall, A (1) Roux, M (1) Palavra-chave Imaging techniques (2) Marine technology (2) Underwater photography (2) Acoustics (1) Bathyal zone (1) Biology (1) Biomass (1) Continental margins (1) Cruises (1) Detection (1) Diving (1) Geology (1) Image processing (1) Lasers (1) Optics (1) Sedimentation (1) Side scan sonar (1) Sonar imagery (1) Submersibles (1) Underwater cameras (1) Mais... Tipo do documento Text (2) Ano 1990 (2) País France (2) Idioma Francês (2)		Ordenar por:  Relevância Autor Título Ano Registros recuperados: 2 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 Observations dans les zones peu accessibles de l'environnement bathyal (biologie et geologie) grace a l'usage des soucoupes plongeantes ArchiMer Roux, M. On the bathyal slope for continental margins, steep and rocky substrates punctuated with cliffs and collapsing zones are frequently found. As survey and sampling with the classical technics from the sea surface is practically impossible in such an environment, in situ exploration with a submersible allows significant advances in ecology, with implications in paleoenvironment reconstruction. Mixing of material from shallow-water and deep-sea origins into bathyal sedimentation suggests that the so-called "fossil assemblages of outer platform" were frequently misinterpreted. Dense populations of animals closely related to fossil groups which were only considered as relict of the Past ("living fossils") and previously interpreted as shallow-water inhabitants... Tipo: Text Palavras-chave: Continental margins; Bathyal zone; Diving; Cruises; Sedimentation; Biomass; Geology; Biology; Imaging techniques; Image processing; Marine technology; Underwater photography; Submersibles. Ano: 1990 URL: http://archimer.ifremer.fr/doc/1990/acte-1138.pdf Registros recuperados: 2 Primeira ... 1 ... Última

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