Abstract
Abstract An infrared camera technique designed for remote sensing of air–water heat flux has been developed. The technique uses the differential absorption of water between 3.817 and 4.514 microns. This difference causes each channel’s radiance to originate over a different range of depths inside the air–water interface temperature gradient. Since this gradient varies only with total heat flux, the radiance difference between channels caused by the gradient also varies with heat flux. Laboratory experiments showed that this radiance difference correlates well with heat flux measured independently with calorimetry. A regression relation between camera output and heat flux is determined initially using time variations of the radiance difference and heat flux. This relation is modified by a partial differential analysis of the relative contributions of temperature and heat flux using data from experiments designed for this evaluation. The result is applied to the spatial variations of radiance difference in ...
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