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Self-shading error of in-water optical measurements has been experimentally estimated for upwelling radiance and irradiance measurements taken just below the water surface. Radiance and irradiance data have been collected with fibre optics housed in the centre of a disc simulating the size of the instrument. Analysis of measurements taken at 500, 600 and 640 nm in lake waters have shown errors ranging from a few percent up to several tens percent as a function of size of the radiometer, absorption coefficient of the medium, sun zenith and atmospheric turbidity. Comparisons between experimental and theoretical errors have shown absolute differences generally lower than 5 % for radiances and lower than 3 % for irradiances. Analysis of radiance measurements taken with 1 and 18 fields of view have not shown appreciable differences in the self-shading error.

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Authors: ZIBORDI G, JRC Ispra (IT);FERRARI G M, JRC Ispra (IT)
Bibliographic Reference: Article: Applied Optics, Vol. 34 (1995) No. 15, pp. 2750-2754
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