| || Remote Sensing of Sea State by the Brewsters Angle Technique
Author : Sathe, P.V.;Kumar, Ajoy
Source : Defence Science Journal ; Vol:40(2) ; 1990 ; pp 119-131
Subject : 623.8 Naval Science
Keywords : Air sea interface;Cox and Munk wind speed wave slope;Spatial distribution;Polarised fraction;Unpolarised light;Rayleigh atmosphere
Abstract : The extent of plane polarised light resulting from Brewsters reflection from the wide-roughened sea surface is studied for various sea states on the assumption that the incident light on the air-sea interface is unpolarised. The sea states associated with different wind speeds are simulated using the Cox and Munk 'wind speed-wave slope' law and the Gaussian distribution of wave-slopes. The spatial distribution of plane polarised component of diffuse reflected light is also studied with a view to exploring possibilities of using this parameter for remote sensing of sea state from a sensor viewing the sea surface through an appropriate polaroid. The results show that the plane polarised fraction of reflected light as received in a given look angle can be directly related to the prevailing sea state and can be used as a convenient parameter for remote sensing of sea state. The scope and limitations of the method proposed are discussed.