Hannover 2016 – wissenschaftliches Programm

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P: Fachverband Plasmaphysik

P 10: Poster Session- Dusty Plasmas

P 10.10: Poster

Dienstag, 1. März 2016, 16:30–19:00, Empore Lichthof

Optical Methods for in-situ Size Determination of Dust — •Oguz Han Asnaz, Franko Greiner, and Alexander Piel — Christian-Albrechts-Universität zu Kiel

In many applications in the field of dusty plasmas, knowledge of the particle radius is needed. Manufacturer’s data are often used for micro-dust, but ex-situ TEM measurements have shown smaller particle radii than expected [1]. Processes in plasmas can produce further systematic errors by degassing of water or etching processes [2]. Thus an in-situ determination of the particle radius is needed. So far such measurements can only be performed indirectly by determining the particle mass, which shows a further dependency on the particle mass density. Therefore a change in mass can indicate a change in either mass density or radius. In this contribution optical methods are presented, where the particle radius is determined directly by optical imaging and measurements of the scattering or diffraction patterns.
This work was funded by the DFG within the SFB-TR24, project A2.
[1] B. Liu et al., Phys. Plasmas 10, 9 (2003)
[2] J. Carstensen et al., Phys. Plasmas 18, 033701 (2011)