Springer Series in Light Scattering by Alexander Kokhanovsky

Author:Alexander Kokhanovsky
Language: eng
Format: epub, pdf
ISBN: 9783319708089
Publisher: Springer International Publishing

4.3 Laboratory Testing of VSF Meter

4.3.1 Primary Experiments to Measure Angular Scattering Properties in Clean Seawater, and in Water with Bubbles of Different Size

The first version of the instrument was tested at the Marine Optics Department of the Marine Hydrophysical Institute in Sevastopol in the end of November, 1999. Measurements in air and in turbid water confirmed the correctness of VSF meter principles. A more careful testing and calibration of the improved version of the instrument and some preliminary experiments were carried out using facilities of the Department of Oceanography, Dalhousie University, Halifax, Nova Scotia, Canada (Zhang et al. 2002).

First set of experiments was made to estimate the level of noise of the instrument, its sensitivity, dynamical range and characteristic of glint-rejection. Measurements were performed in distilled fresh water and in clean seawater. The VSF meter was submerged in the tank and the water was pumped through the working chamber. The distilled water in the tank was changed five times to assure the purity of the water filling the chamber of the instrument. After that, the tank was filled by clean seawater (filtered with 0.2 µm pore size filters).

Measurements showed that the instrument could distinguish between distilled and clean water. The measured volume scattering function of clean seawater differs from the pure water theoretical curve. It corresponds better to the typical volume scattering functions of oceanic waters measured by (Kullenberg 1968). The volume scattering function of the Case-2 Halifax Harbor surface water also was measured. The volume scattering function curves displayed in Fig. 4.4 show difference in scattering properties.

Fig. 4.4Volume scattering functions of different waters

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