Volume scattering function measurement error: effect of angular resolution of the nephelometer

The finite angular resolution of nephelometers causes systematic measurement error of the volume scattering function. For scattering angles 90 degrees the error also depends on the attenuation of light in seawater and the instrument size. For nephelometers with angular resolution of ~2 degrees , in...

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Bibliographic Details
Published in:Applied optics (2004) 1990-01, Vol.29 (1), p.64-70
Main Author: Jonasz, M
Format: Article
Language:English
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Summary:The finite angular resolution of nephelometers causes systematic measurement error of the volume scattering function. For scattering angles 90 degrees the error also depends on the attenuation of light in seawater and the instrument size. For nephelometers with angular resolution of ~2 degrees , in clean ocean waters the error may assume a negative value of the order of -20% at scattering angles smaller than ~5 degrees , i.e., the scattering function may be underestimated. The error may then increase to as much as +15% at ~10 degrees , i.e., the scattering function may be overestimated. For greater scattering angles the error decreases to a few percent until, in turbid coastal waters, it may reach a negative peak of the order of -3% at ~170 degrees , followed by an increase to about +15% for scattering angles in the vicinity of 175 degrees .
ISSN:1559-128X
DOI:10.1364/AO.29.000064