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Proceedings Paper

Holographic Interferometry Applied To Symmetric Aerodynamic Models In A Wind Tunnel
Author(s): Richard L. Perry; George Lee
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Paper Abstract

The technique of holographic interferometry provides a means for noninvasive measurement of the air density distribution in the flow field in the vicinity of an aerodynamic model. A test of the applicability of this technique was the objective of this investigation. A holographic interferometer was installed in the 2- by 2-Foot Transonic Wind Tunnel at Ames Research Center. Several tests were conducted with this system on two axisymmetric models, one at subsonic and the other at supersonic speeds. Holograms were made of the flow field around the model for several test conditions. These holograms were reconstructed into interferograms in the laboratory. The fringe distribution (a measure of local densities) from a number of interferograms was digitized for subsequent data reduction. A computer program based on the Fourier transform technique was developed to convert the fringe distribution into a three-dimensional distribution of air density around the model. These results will be presented in this paper.

Paper Details

Date Published: 12 June 1985
PDF: 8 pages
Proc. SPIE 0523, Applications of Holography, (12 June 1985); doi: 10.1117/12.946271
Show Author Affiliations
Richard L. Perry, University of the Pacific (United States)
George Lee, NASA-Ames Research Center (United States)

Published in SPIE Proceedings Vol. 0523:
Applications of Holography
Lloyd Huff, Editor(s)

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