Physics – Condensed Matter – Soft Condensed Matter
Scientific paper
2007-11-08
Optics express 15, 23 (2007) 15250-15259
Physics
Condensed Matter
Soft Condensed Matter
11 pages, 4 figures
Scientific paper
10.1364/OE.15.015250
We describe an extension of multi-speckle diffusing wave spectroscopy adapted to follow the non-stationary microscopic dynamics in drying films and coatings in a very reactive way and with a high dynamic range. We call this technique "Adaptive Speckle Imaging Interferometry". We introduce an efficient tool, the inter-image distance, to evaluate the speckle dynamics, and the concept of "speckle rate" (SR, in Hz) to quantify this dynamics. The adaptive algorithm plots a simple kinetics, the time evolution of the SR, providing a non-invasive characterization of drying phenomena. A new commercial instrument, called HORUS(R), based on ASII and specialized in the analysis of film formation and drying processes is presented.
Brun Alice
Brunel Laurent
Cipelletti Luca
Snabre Patrik
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