Journal
EUROPEAN PHYSICAL JOURNAL-APPLIED PHYSICS
Volume 22, Issue 2, Pages 143-154Publisher
E D P SCIENCES
DOI: 10.1051/epjap:2003014
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We describe an optical fiber based interferometer to measure velocity profiles in sheared complex fluids using dynamic light scattering ( DLS). After a review of the theoretical problem of DLS under shear, a detailed description of the setup is given. We outline the various experimental difficulties induced by refraction when using a Couette cell. We also show that homodyne DLS is not well suited to measure quantitative velocity profiles in narrow-gap Couette geometries. On the other hand, the heterodyne technique allows us to determine the velocity field inside the gap of a Couette cell. All the technical features of the setup, namely its spatial resolution (approximate to 50-100 mum) and its temporal resolution (approximate to 1 s per point, approximate to 1 min per profile) are discussed, as well as the calibration procedure with a Newtonian fluid. As briefly shown on oil-in-water emulsions, such a setup permits one to record both velocity profiles and rheological data simultaneously.
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