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Applied Optics

Applied Optics

APPLICATIONS-CENTERED RESEARCH IN OPTICS

  • Editor: James C. Wyant
  • Vol. 45, Iss. 10 — Apr. 1, 2006
  • pp: 2155–2165

Gradient-driven fluctuations experiment: fluid fluctuations in microgravity

Alberto Vailati, Roberto Cerbino, Stefano Mazzoni, Marzio Giglio, Gennady Nikolaenko, Christopher J. Takacs, David S. Cannell, William V. Meyer, and Anthony E. Smart  »View Author Affiliations


Applied Optics, Vol. 45, Issue 10, pp. 2155-2165 (2006)
http://dx.doi.org/10.1364/AO.45.002155


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Abstract

We describe an experimental breadboard developed for the investigation of nonequilibrium fluctuations induced by macroscopic temperature and concentration gradients under microgravity conditions. Under these conditions the amplitude of the fluctuations diverges strongly for long wavelengths. The setup was developed at the University of Milan and at the University of California at Santa Barbara within the gradient-driven fluctuations experiment (GRADFLEX) project of the European Space Agency, in collaboration with the National Aeronautics and Space Administration. The apparatus uses a quantitative shadowgraph technique for characterization of the static power spectrum of the fluctuations S ( q ) and the measurement of their dynamics. We present preliminary experimental results for S ( q ) obtained in the presence of gravity for gradient-driven fluctuations for two cases, those induced in a liquid mixture with a concentration gradient produced by the Soret effect and those induced in a single-component fluid by a temperature gradient.

© 2006 Optical Society of America

OCIS Codes
(040.2840) Detectors : Heterodyne
(070.2580) Fourier optics and signal processing : Paraxial wave optics
(100.2000) Image processing : Digital image processing
(110.6760) Imaging systems : Talbot and self-imaging effects
(120.5820) Instrumentation, measurement, and metrology : Scattering measurements

ToC Category:
Photon Correlation and Scattering

History
Original Manuscript: August 2, 2005
Revised Manuscript: November 30, 2005
Manuscript Accepted: December 6, 2005

Citation
Alberto Vailati, Roberto Cerbino, Stefano Mazzoni, Marzio Giglio, Gennady Nikolaenko, Christopher J. Takacs, David S. Cannell, William V. Meyer, and Anthony E. Smart, "Gradient-driven fluctuations experiment: fluid fluctuations in microgravity," Appl. Opt. 45, 2155-2165 (2006)
http://www.opticsinfobase.org/ao/abstract.cfm?URI=ao-45-10-2155

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