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Proceedings Paper

Practical comparison of three tomography algorithms using a simulated 3D flow field
Author(s): Joseph C. Hsu; James D. Trolinger
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Paper Abstract

Tomography is a technique known for integrating two-dimensional projections into three- dimensional objects. In our application, tomography is used to determine the three- dimensional gas density distribution from a set of two-dimensional interferograms. In an Aeroballistic Range, tomography can be used with multiple-view interferometry to obtain the density field between the shock wave and the model surface. A supersonic flow model is generated by computer code for a 10-degree half angel sharp cone traveling with an angle of attack. Two freestream Mach numbers, 3 and 5, are tested. The calculated indices of refraction are projected two-dimensionally to simulate the results obtained from projected holographic interferometry. Three algorithms based on pixels, a triangular mesh, and polynomial/Fourier decomposition, are used to invert the results tomographically into its three-dimensional flow field. The proficiency and the accuracy of each algorithm are compared under the same matrix inversion process.

Paper Details

Date Published: 15 February 1993
PDF: 12 pages
Proc. SPIE 1756, Interferometry: Applications, (15 February 1993); doi: 10.1117/12.140798
Show Author Affiliations
Joseph C. Hsu, MetroLaser (United States)
James D. Trolinger, MetroLaser (United States)

Published in SPIE Proceedings Vol. 1756:
Interferometry: Applications
Ryszard J. Pryputniewicz; Gordon M. Brown; Werner P. O. Jueptner, Editor(s)

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