Phys. Rev. Lett. 90, 184302 (2003) [4 pages]Speckle Visibility Spectroscopy and Variable Granular FluidizationReceived 20 December 2002; published 8 May 2003 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. © 2003 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.90.184302
DOI:
10.1103/PhysRevLett.90.184302
PACS:
45.70.Mg, 78.35.+c, 81.05.Rm
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