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| Backscattering | ||||
| This technology is used
to trace the concentration changes due to sedimentation / flotation
of particles with high sensitivity. The new measuring technique using
light backscattering signals allows for fast measurement of stability
and/or demixing phenomena of up to 8 different samples simultaneously,
by monitoring the concentration change in a very small region of interest
at the inclined bottom of sample cell (see Figure). In case of sedimentation particles are entering the small region of interest at the sample cell bottom, leading to an increase in backscattering signal. The opposite behaviour occurs for creaming samples. The particles are leaving the region of interest at the bottom of the sample cell. The upwards movement of particles results in a decrease of the backscattering signal over time. |
 Principle of near-infrared backscattering and change of signal with time – measurement principle of LUMiCheck®. (to see full size, click on the image) |
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| As the region of interest
is restricted to a very small volume just above the bottom even small
concentration changes are traced very rapidly, therefore the measuring
time is normally short. The curves are fitted with multi parametric equations continuously during the experiment in the device itself. The fitting parameters make it possible to compare different samples quantitatively regarding demixing behaviour, sediment packing, stability etc. |
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