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Jonasz M 1990 Volume scattering function measurement ...

Abstract
The finite angular resolution of nephelometers causes systematic measurement error of the volume scattering function. For scattering angles <90° this error depends mainly on the angular resolution of the nephelometer. For scattering angles >90° the error also depends on the attenuation of light in seawater and the instrument size. For nephelometers with angular resolution of ~2°, in clean ocean waters the error may assume a negative value of the order of -20% at scattering angles smaller than ~5°, i.e., the scattering function may be underestimated. The error may then increase to as much as + 15% at ~10°, 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°, followed by an increase to about +15% for scattering angles in the vicinity of 175° ^a. [Reprinted by permission of the Optical Society of America]

^a - see also Jonasz M and Fournier 2007, p. 174