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1 December 1991 Detector perturbation of ocean radiance measurements
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The effect of a detector on the ocean radiance field being measured has been investigated -- first, in a simple model that accounts for perturbations in the radiance field introduced by the detector shadow and by light reflecting from the detector, and second, by a complete three- dimensional solution of the radiation transfer equation that calculates the perturbations by using a computer model of a 4(pi) radiance detection system (RADS2) with sky and ocean parameter choices to match California coastal water. Results show that the presence of the detector has little influence on downwelling measurements nor do changes in detector reflectance. There is a substantial change due to the detector of upwelling radiance values. This may cause measured values to be reduced by as much as 30% below the unperturbed radiance for systems of the size of RADS (0.5 m) for light coming from the region of the detector shadow. The upwelling irradiance for this case is reduced 10%. Results are given for sensor 0.5 m high and having diameters from 0.125 m to 2 m.
© (1991) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Burns Macdonald, William S. Helliwell, James Sanborn, and Kenneth John Voss "Detector perturbation of ocean radiance measurements", Proc. SPIE 1537, Underwater Imaging, Photography, and Visibility, (1 December 1991);


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