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Erschienen in:
2009 | OriginalPaper | Buchkapitel
Principles of a Volumetric Velocity Measurement Technique Based on Optical Aberrations
verfasst von : Rainer Hain, Christian J. Kähler, Rolf Radespiel
Erschienen in: Imaging Measurement Methods for Flow Analysis
Verlag: Springer Berlin Heidelberg
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In this contribution, a simple and robust three dimensional measurement technique for the determination of all velocity components is presented. As opposed to other techniques, only a single camera is required in order to calculate the particle positions in physical space. This is possible because the depth position of the particles is encoded using an optical aberration or wavefront distortion, called astigmatism. The astigmatism causes the particle images to have ellipse-like shapes. The length of the semi-major axis and the semi-minor axis depends on the depth wise position of the particle. It will be shown that this effect is well suited for extracting the particle positions. In the first section, an introduction is given and the measurement principle is shown in detail. Subsequently, the validation of the technique is illustrated by means of synthetically generated images. Finally, experimental results are presented and a conclusion is drawn.