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Proceedings Paper

Fourier transform phase difference method optimization for supersonic gas flow characterization
Author(s): Francisco Rodríguez Lorenzo; Benito Vázquez Dorrío; Jesús Blanco García
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Paper Abstract

In this work we propose a complete characterization method for supersonic gas flow. The optical phase of fringe patterns acquired in a simple Mach Zehnder interferometer is extracted with a differential phase evaluation method based on Fourier Transform (without translation to the frequency origin); reducing the computation steps and decreasing the errors due to the unwrapping process. Optical phase, gradient and Laplacian maps obtained allow detailed analysis of the pressure distribution, and shock wave patterns. We optimize phase evaluation process by studying and comparing effects of four different bandpass filters on phase maps by using quality maps as estimator.

Paper Details

Date Published: 22 August 2017
PDF: 13 pages
Proc. SPIE 10453, Third International Conference on Applications of Optics and Photonics, 104532U (22 August 2017); doi: 10.1117/12.2276336
Show Author Affiliations
Francisco Rodríguez Lorenzo, Univ. de Vigo (Spain)
Benito Vázquez Dorrío, Univ. de Vigo (Spain)
Jesús Blanco García, Univ. de Vigo (Spain)

Published in SPIE Proceedings Vol. 10453:
Third International Conference on Applications of Optics and Photonics
Manuel Filipe P. C. M. Martins Costa, Editor(s)

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