w angle light scattering and turbidity Turbidity detectors have been described for AUC for particle size distribution analysis (Mächtle 1999a; Müller 1989; Scholtan and Lange 1972). A small-angle laser light scattering detector was also described to analyze molar mass distributions (Bhattacharyya 2006). These optical systems typically operate at a fixed radial position and acquire data with every rotor turn in order to capture the sedimentation of fast-moving particles. In combination with speed ramps they reach a measurement range of 20–5,000 nm for polymer particles (Mächtle and Börger 2006).
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