High speed digital holographic interferometry for hypersonic flow visualization

Hegde, GM and Jagdeesh, G and Reddy, KPJ (2013) High speed digital holographic interferometry for hypersonic flow visualization. In: 2nd Conference of the Optics-and-Photonics-Society-of-Singapore / International Conference on Optics in Precision Engineering and Nanotechnology (icOPEN), APR 09-11, 2013, Singapore, SINGAPORE.

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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.

Item Type:	Conference Paper
Series.:	Proceedings of SPIE
Publisher:	SPIE-International Society for Optical Engineering
Additional Information:	Copyright of this article belongs to SPIE-International Society for Optical Engineering.
Keywords:	Interferometry; Digital Holography; High Speed Flow
Department/Centre:	Division of Interdisciplinary Sciences > Centre for Nano Science and Engineering
Date Deposited:	22 Oct 2013 12:12
Last Modified:	28 Oct 2013 05:16
URI:	http://eprints.iisc.ac.in/id/eprint/47555

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