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Digital holographic interferometry in high-speed flow research

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Abstract

A dual reference beam, plane wave, digital holographic interferometric system has been developed. It has also been applied as a non-intrusive optical diagnostic tool to a high speed flow. Quantitative density data has been extracted automatically by first generating phase-stepped interferograms. These were then digitized via a charge coupled device (CCD) camera and digitally post-processed within the memory of a computer. The results obtained have mapped an instantaneous 3-D density distribution of an unsteady flow field onto a 2-D projection plane. They show quantitatively the interaction between a shock wave and a turbulent boundary layer. A description has also been made showing how the dual reference beam technique can be extended to provide a quantitative density measurement of turbulent and unsteady flow structures.

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Authors and Affiliations

  1. Dept. of Aerospace Engineering, Delft University of Technology, Kluyverweg 1, P.O. Box 5058, 2629, HS Delft, The Netherlands

    T. A. W. M. Lanen & P. G. Bakker

  2. Dept. of Engineering, Warwick University, CV4 7AL, Coventry, UK

    P. J. Bryanston-Cross

Authors
  1. T. A. W. M. Lanen
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  2. P. G. Bakker
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  3. P. J. Bryanston-Cross
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Lanen, T.A.W.M., Bakker, P.G. & Bryanston-Cross, P.J. Digital holographic interferometry in high-speed flow research. Experiments in Fluids 13, 56–62 (1992). https://doi.org/10.1007/BF00208076

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  • DOI: https://doi.org/10.1007/BF00208076

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