Abstract

When the water surface temperature is measured with an infrared radiometer (8–13 μm), there is an error due to reflection on the water surface which is about 0.5°C and depends on sky radiance. This reflection error can be divided by more than four if the infrared radiometer is fitted with a polarizer and sights the water surface at Brewsterian incidence. Two successive measurements give an estimate of this error, the first one with the polarizer axis parallel to the incidence plane and the other one with this axis perpendicular to it. Experiments have been performed on a laboratory water tank to check that point. The results are little modified by taking into account the surface roughness induced by wind.

© 1973 Optical Society of America

Mesure de la réflectance de miroirs métalliques dans l’infrarouge

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