Direct Measurement of the Density Field Using High Speed Differential Interferometry

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


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.


Mach Number Test Section Interference Fringe Optical Setup Path Difference 
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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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