Use of Electronic Speckle Pattern Interferometry in Fluid Physics

  • O. Dupont
  • L. Joannes
  • J. L. Dewandel
  • J. C. Legros
Conference paper

Abstract

Real-time holographic interferometry is a well-established technique for capturing the refractive index field in transparent media. More particularly in the field of heat transport phenomena, Koster obtained remarkable results on convection patterns by using holographic interferometry. During the past decade, electronic speckle pattern interferometry (ESPI), commonly used in solid mechanics, was used for gas flow analysis. The Microgravity Research Centre has extended its use in fluid physics by decoupling the physical parameter to be measured from the necessity of creating a speckle pattern. The paper will focus on the description of the two main experimental arrangements used in fluid mechanics. These are: the measurement of the variation of the liquid refractive index due to temperature or concentration change and the measurement of the liquid/gas interface deformation. The proposed set-ups will be supported by a detailed optical analysis. The measurement capabilities of the two systems are demonstrated on convective instability experiments in fluid mechanics.

Keywords

Convection Depression Hexagonal Stratification Refraction 

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Copyright information

© Springer-Verlag Berlin Heidelberg 2000

Authors and Affiliations

  • O. Dupont
    • 1
  • L. Joannes
    • 1
  • J. L. Dewandel
    • 1
  • J. C. Legros
    • 1
  1. 1.Microgravity Research CentreUniversité Libre de BruxellesBruxelles, BelgiqueBelgium

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