Use of dynamic schlieren interferometry to study fluctuations during free diffusion.

  title={Use of dynamic schlieren interferometry to study fluctuations during free diffusion.},
  author={Fabrizio Croccolo and Doriano Brogioli and Alberto Vailati and M. Giglio and David S. Cannell},
  journal={Applied optics},
  volume={45 10},
We used a form of schlieren interferometry to measure the mean-squared amplitude and temporal autocorrelation function of concentration fluctuations driven by the presence of a gradient during the free diffusion of a urea solution into water. By taking and processing sequences of images separated in time by less than the shortest correlation time of interest, we were able to simultaneously measure dynamics at a number of different wave vectors. The technique is conceptually similar to the… CONTINUE READING

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