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Direct Measurement of the Density Field Using High Speed Differential Interferometry

  • J. M. Desse
  • J. C. Pegneaux
Conference paper

Abstract

The optical method presented here is based on Wollaston biprism differential interferometry using a white light source. It yields high-speed, instantaneous interferograms which directly display the isochoric lines of an instationary, two-dimensional flow. The setup is equivalent to conventional separate-reference interferometric systems, but remains differential since one of the beams — the one used as reference — lies inside the undisturbed upstream flow. The method was used to get instantaneous, high speed displays of the instationary flow around a cylinder placed across the test section.

Keywords

Mach Number Test Section Interference Fringe Optical Setup Path Difference 
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Références

  1. [1]
    Desse, J. M. 1990: Instantaneous density measurement in two dimensional gas flow by high speed differential interferometry. Exp. Fluids 9, 85–91.CrossRefGoogle Scholar
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    Desse, J. M.; Pegneaux, J. C. 1990: Whole-field measurement of gas density from simultaneously recorded interferograms. Exp. Fluids 12, 1–9.Google Scholar
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    Smeets, G. 1968: Interféromètre différentiel à faisceaux fortement séparés. Dépouillement des interférogrammes. ISL TN, 41/68.Google Scholar
  4. [4]
    Carlomagno, G. M. 1986: A wollaston prism interferometer used as a reference beam interferometer. Flow visualization IV (Ed. Veret, C.) pp 105-110.Google Scholar
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    Gontier, G. 1959: Description et réglage du strioscope I. M. F. L. IMFL TN Gr 89.Google Scholar

Copyright information

© Springer-Verlag Berlin Heidelberg 1992

Authors and Affiliations

  • J. M. Desse
    • 1
  • J. C. Pegneaux
    • 1
  1. 1.Office National d’Etudes et de Recherches AérospatialesInstitut de Mécanique des Fluides de LilleLilleFrance

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