Fourier transform phase difference method optimization for supersonic gas flow characterization

Francisco Rodríguez Lorenzo; Benito Vázquez Dorrío; Jesús Blanco García

doi:10.1117/12.2276336

22 August 2017 Fourier transform phase difference method optimization for supersonic gas flow characterization

Francisco Rodríguez Lorenzo, Benito Vázquez Dorrío, Jesús Blanco García

Proceedings Volume 10453, Third International Conference on Applications of Optics and Photonics; 104532U (2017) https://doi.org/10.1117/12.2276336
Event: Third International Conference on Applications of Optics and Photonics, 2017, Faro, Portugal

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.

Citation Download Citation

Francisco Rodríguez Lorenzo, Benito Vázquez Dorrío, and Jesús Blanco García "Fourier transform phase difference method optimization for supersonic gas flow characterization", Proc. SPIE 10453, Third International Conference on Applications of Optics and Photonics, 104532U (22 August 2017); https://doi.org/10.1117/12.2276336

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