Principles of a Volumetric Velocity Measurement Technique Based on Optical Aberrations

  • Hain R
  • Kähler C
  • Radespiel R
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Abstract

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.

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Authors

  • Rainer Hain

  • Christian Kähler

  • Rolf Radespiel

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