Static Multiple Light Scattering is the key optical method to characterize concentrated liquid dispersions without dilution.
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This principle of measurement is used by the Turbiscan™ in order to detect particle size change and/or local concentration change while the sample is destabilising, this more accurately and faster than the eye.
From Backscattering measurement it is possible to:
MLS consists of sending photons (NIR light source, 880nm) into the sample. These photons, after being scattered many times by the particles (or droplets) in the dispersion emerge from the sample and are detected by the 2 detectors of the Turbiscan™ reading head:
Transmission for non opaque samples
(0° from light source)
Backscattering for opaque samples
(135° from the light source)
Backscattering is directly related to the photon transport mean free path. Thus Backscattering intensity depends on particle size and concentration.