Impacts of Optical Turbulence on Underwtaer Imaging
NAVAL RESEARCH LAB STENNIS DETACHMENT STENNIS SPACE CENTER MS OCEANOGRAPHY DIV
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Optical signal transmission underwater is of vital interests to both civilian and military applications. The range and signal to noise during the transmission, as a function of system and water optical properties determines the effectiveness of EO technology. These applications include diver visibility, search and rescue, mine detection and identification, and optical communications. The impact of optical turbulence on underwater imaging has been postulated and observed by many researchers. However, no qualitative studies have been done until recently, in terms of both the environmental conditions, and impacts on image quality as a function of range and spatial frequencies Image data collected from field measurements during SOTEX Skaneateles Optical Turbulence Exercise, July 22-31. 2010 using the Image Measurement Assembly for Subsurface Turbulence IMAST are presented Optical properties of the water column in the field were measured using WETLabs ac-9 and Laser In Situ Scattering and Transmissometer LISST, Sequoia Scientific, in coordination with physical properties including CTD Seabird, dissipation rate of kinetic energy and heat, using both the Vector velocimeter and CT combo Nortek and PME. and shear probe based Vertical Microstructure Profiler VMP. Rockland. The strong stratification structure in the water column provides great opportunity to observe various dissipation strengths throughout the water column, which corresponds directly with image quality as shown. Initial results demonstrate general agreement between data collected and model prediction, while discrepancies between measurements and model suggest higher spatial and temporal observations are needed in the future.
- Optical Detection and Detectors