Proceedings PaperWind Speed Measurement From Below The Sea Surface By Correlation
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The angular aspect of optical radiation transmitted throuyn the air-sea interface depends upon the effective slope of the particular element of sea surface illuminated at that particular instant of time. Waves and swells strongly effect the resultant rauiance distribution below the surface, by focusing and dispersing small light ray bundles, The air-sea interface, however, is influenced most by small wavelengths and ripples created by the wind. Empirical relationships between wave slope variance and wind speea nave been determined, and the underwater radiance variance is known in terms of the wave slope variance. As a result, it is possible to measure the wind speed from under the surface by sampling the variance of the radiation field there. An alternate method is described here which takes from laser transit velocimetry. Several sensors are placed below tree surface and their signals are correlated for a technique to measure wave ana wind speed.