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10 May 2011 Slant path 1.5 μm range gated imaging close to ground
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Abstract
This paper will report experiments, analysis and simulations of slant path imaging using 1.5 μm gated imaging. The measurements were taking place at a former airfield along a 2 km path. The sensor was elevated by a lift in steps from 2-12.5 meters. Targets were resolution charts. The turbulence was measured along the path with a scintillometer. Turbulence information was also obtained at various path positions including the elevated cage using anemometers. The camera was collecting both passive and active images in the SWIR region. In the passive mode (using solar illumination) the noise due to speckles are eliminated and the influence by scintillation limited. In the active mode on the other hand these noise sources are present to a varying degree depending on stabilized frame averaging and on the sensor elevation. A trend is that the image quality is improved for elevated sensor positions. Two light sources in the camera FOV (head lights from a car) gave independent turbulence level estimates. The paper will present evaluated images for both passive and active modes obtained at different elevations and the result will be compared with theory including image simulation.
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Ove Steinvall, Magnus Elmqvist, Kjell Karlsson, Ove Gustafsson, and Tomas Chevalier "Slant path 1.5 μm range gated imaging close to ground", Proc. SPIE 8037, Laser Radar Technology and Applications XVI, 803703 (10 May 2011); https://doi.org/10.1117/12.883364
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