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Experiments in Fluids

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01.06.2018 | Research Article

Real-time quantitative Schlieren imaging by fast Fourier demodulation of a checkered backdrop

verfasst von: Sander Wildeman

Erschienen in: Experiments in Fluids | Ausgabe 6/2018

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Abstract

A quantitative synthetic Schlieren imaging (SSI) method based on fast Fourier demodulation is presented. Instead of a random dot pattern (as usually employed in SSI), a 2D periodic pattern (such as a checkerboard) is used as a backdrop to the refractive object of interest. The range of validity and accuracy of this “Fast Checkerboard Demodulation” (FCD) method are assessed using both synthetic data and experimental recordings of patterns optically distorted by small waves on a water surface. It is found that the FCD method is at least as accurate as sophisticated, multi-stage, digital image correlation (DIC) or optical flow (OF) techniques used with random dot patterns, and it is significantly faster. Efficient, fully vectorized, implementations of both the FCD and DIC/OF schemes developed for this study are made available as open source Matlab scripts.

Vorheriger Artikel Tomographic PIV of flow through ordered thin porous media

Nächster Artikel 3D Measurements of coupled freestream turbulence and secondary flow effects on film cooling

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Titel: Real-time quantitative Schlieren imaging by fast Fourier demodulation of a checkered backdrop
verfasst von: Sander Wildeman
Publikationsdatum: 01.06.2018
Verlag: Springer Berlin Heidelberg
Erschienen in: Experiments in Fluids / Ausgabe 6/2018
Print ISSN: 0723-4864
Elektronische ISSN: 1432-1114
DOI: https://doi.org/10.1007/s00348-018-2553-9

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