SKM 2023 – wissenschaftliches Programm

Bereiche | Tage | Auswahl | Suche | Aktualisierungen | Downloads | Hilfe

DY: Fachverband Dynamik und Statistische Physik

DY 7: Granular Matter and Contact Dynamics

DY 7.3: Vortrag

Montag, 27. März 2023, 10:30–10:45, ZEU 148

Dynamic light scattering from single macroscopic particles — Lisa Künstler¹, Raphael Kessler¹, Matthias Sperl^{1, 2}, and •Philip Born¹ — ¹Institut für Materialphysik im Weltraum, Deutsches Zentrum für Luft- und Raumfahrt (DLR), 51170, Köln, Germany — ²Institut für Theoretische Physik, Universität zu Köln, 50937, Köln, Germany

Here we present a methodology to extract information from the fluctuations in light scattered from moving single granular particles. We first describe the experimental setup and the associated theoretical framework required to isolate contributions to the intensity autocorrelation function emerging from translational and from rotational particle motion [1]. We subsequently present an approach to extract the angular velocity and the translational speed of the granular particles from the light scattering data. The approach is applied to a small ensemble of granular particles in an hour-glass-like experiment to determine the granular temperature with a dynamic light scattering measurement. The results indicate the next steps to be taken to eventually develop a thermometer for fluidized granular media based on dynamic light scattering.

[1] L. Dossow, R. Kessler, M. Sperl, & P. Born, Dynamic light scattering from single macroscopic particles. Applied Optics, 60(32), 10160-10167 (2021).