Digital holographic interferometry in high-speed flow research

A dual reference beam, plane wave, digital holographic interferometric system has been developed. It has also been applied as a nonintrusive optical diagnostic tool to a high speed flow. Quantitative density data has been extracted automatically by first generating phase-stepped interferograms. Thes...

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Bibliographic Details
Published in:Experiments in fluids 1992-05, Vol.13 (1), p.56-62
Main Authors: LANEN, T. A. W. M, BAKKER, P. G, BRYANSTON-CROSS, P. J
Format: Article
Language:English
Subjects:
Exact sciences and technology
Fluid dynamics
Fundamental areas of phenomenology (including applications)
Instrumentation for fluid dynamics
Physics
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Description
Summary:A dual reference beam, plane wave, digital holographic interferometric system has been developed. It has also been applied as a nonintrusive 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 3D density distribution of an unsteady flowfield onto a 2D 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. (Author)
ISSN:0723-4864
1432-1114
DOI:10.1007/BF00208076