Investigation of the properties of a sharp-focusing schlieren system by means of Fourier analysis |
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Authors: | Axel Hanenkamp Wolfgang Merzkirch |
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Institution: | Lehrstuhl für Strömungslehre, Universität Essen, D-45117 Essen, Germany |
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Abstract: | The sharp-focusing schlieren system is analysed by means of a Fourier approach. The signal received in the imaging plane is governed by the phase distribution in a particular object plane normal to the optical axis, while the contributions from other planes in the object that are out-of-focus can be considered as noise. A numerical simulation performed for a specific test object shows that the best spatial resolution is obtained with a system of five channels and that further increase of the number of channels does not improve the signal quality. |
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Keywords: | Visualization Schlieren Fourier optics |
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