High speed digital holographic interferometry for hypersonic flow visualization

G. M. Hegde; G. Jagdeesh; K. P. J. Reddy

doi:10.1117/12.2020767

22 June 2013 High speed digital holographic interferometry for hypersonic flow visualization

G. M. Hegde, G. Jagdeesh, K. P. J. Reddy

Proceedings Volume 8769, International Conference on Optics in Precision Engineering and Nanotechnology (icOPEN2013); 87690C (2013) https://doi.org/10.1117/12.2020767
Event: International Conference on Optics in Precision Engineering and Nanotechnology (icOPEN2013), 2013, Singapore, Singapore

Abstract

Optical imaging techniques have played a major role in understanding the flow dynamics of varieties of fluid flows, particularly in the study of hypersonic flows. Schlieren and shadowgraph techniques have been the flow diagnostic tools for the investigation of compressible flows since more than a century. However these techniques provide only the qualitative information about the flow field. Other optical techniques such as holographic interferometry and laser induced fluorescence (LIF) have been used extensively for extracting quantitative information about the high speed flows. In this paper we present the application of digital holographic interferometry (DHI) technique integrated with short duration hypersonic shock tunnel facility having 1 ms test time, for quantitative flow visualization. Dynamics of the flow fields in hypersonic/supersonic speeds around different test models is visualized with DHI using a high-speed digital camera (0.2 million fps). These visualization results are compared with schlieren visualization and CFD simulation results. Fringe analysis is carried out to estimate the density of the flow field.

Citation Download Citation

G. M. Hegde, G. Jagdeesh, and K. P. J. Reddy "High speed digital holographic interferometry for hypersonic flow visualization", Proc. SPIE 8769, International Conference on Optics in Precision Engineering and Nanotechnology (icOPEN2013), 87690C (22 June 2013); https://doi.org/10.1117/12.2020767

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KEYWORDS

Visualization

Fringe analysis

Digital holography

Holography

Fourier transforms

Holographic interferometry

Interferometry

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