Static Multiple Light Scattering

Static Multiple Light Scattering is the key optical method to characterize concentrated liquid dispersions without dilution.


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.

Main advantages

  • No dilution nor sample preparation
  • Non intrusive technique
  • Up to 95% v/v 
  • From 10 nm to 1 mm

From Backscattering measurement it is possible to:

  • Monitor size change vs. time
  • Monitor local concentration change vs. time
  • Measure particles mean diameter or concentration

How does it work?

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.