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Phys Rev Lett. 2003 May 9;90(18):184302. Epub 2003 May 8.

Speckle visibility spectroscopy and variable granular fluidization.

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Department of Physics & Astronomy, University of California, Los Angeles, California 90095, USA.


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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