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Analysis of holographic interferograms of aerodynamic models in a wind tunnelHolographic interferometry provides a non-invasive technique for estimating variations in the air density distribution around aerodynamic models in wind tunnels. The testing of this technique has been underway for some time and has been reported previously for a two dimensional aerodynamic model. Results obtained from tests using three dimensional aerodynamic models are summarized. Holograms were made of aerodynamic models in a wind tunnel. Interferograms were made from these holograms. The interference fringes in these holographic interferograms were digitized and this information was entered into the HOLOFT program. The HOLOFT program successfully calculated the known stagnation air density at the nose of a model and the known air density distribution across the cross section passing through the stagnation point for the axisymmetrical case of this model at a Mach number of 0.8. Thus the technique of holographic interferometry does work.The HOLOFT program stands for HOLOgraphic Inversion by 2-D Fourier Transform.
Document ID
19860019725
Acquisition Source
Legacy CDMS
Document Type
Contractor Report (CR)
Authors
Perry, R. L. (University of the Pacific Stockton, CA, United States)
Date Acquired
September 5, 2013
Publication Date
December 31, 1985
Subject Category
Instrumentation And Photography
Report/Patent Number
NASA-CR-177006
NAS 1.26:177006
Accession Number
86N29197
Funding Number(s)
CONTRACT_GRANT: NCC2-298
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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