Speckle visibility spectroscopy and variable granular fluidization

Details Speckle visibility spectroscopy and variable granular fluidization Speckle visibility spectroscopy and variable granular fluidization

2002-12-21

arxiv.org/abs/cond-mat/0212547v1

Phys. Rev. Lett. 90, 184302 (2003)

Physics

Condensed Matter

Soft Condensed Matter

4 pages, 4 figures, experiment

Scientific paper

10.1103/PhysRevLett.90.184302

We introduce a dynamic light scattering technique capable of resolving motion that changes systematically, and rapidly, with time. It is based on the visibility of a speckle pattern for a given exposure duration. Applying this to a vibrated layer of glass beads, we measure the granular temperature and its variation with phase in the oscillation cycle. We observe several transitions involving jammed states, where the grains are at rest during some portion of the cycle. We also observe a two-step decay of the temperature on approach to jamming.

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