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An optical fiber based interferometer to measure velocity profiles in sheared complex fluids

Published online by Cambridge University Press:  25 February 2003

J.-B. Salmon ,
S. Manneville ,
A. Colin  and
B. Pouligny
J.-B. Salmon
Affiliation:
Centre de Recherche Paul Pascal, avenue Schweitzer, 33600 Pessac, France
S. Manneville
Affiliation:
Centre de Recherche Paul Pascal, avenue Schweitzer, 33600 Pessac, France
A. Colin
Affiliation:
Centre de Recherche Paul Pascal, avenue Schweitzer, 33600 Pessac, France
B. Pouligny
Affiliation:
Centre de Recherche Paul Pascal, avenue Schweitzer, 33600 Pessac, France
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Abstract

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 (≈ 50 − 100 µm) and its temporal resolution (≈ 1 s per point, ≈ 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.

Keywords

Type
Research Article
Information
The European Physical Journal - Applied Physics , Volume 22 , Issue 2 , May 2003 , pp. 143 - 154
Copyright
© EDP Sciences, 2003

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