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Second Thermal and Fluids Engineering  Conference

ISSN: 2379-1748
ISBN: 978-1-56700-430-4

Implementation of Focused Plenoptic Time-Resolved 3D-PTV in the Analysis of a Vortex Flow

Jake Hadfield
Dept. of Mechanical Engineering, University of Alberta, Canada

David S. Nobes
University of Alberta, Department of Mechanical Engineering, Edmonton, T6G 2G8, Alberta, Canada

Abstract

Focused plenoptic imaging is a measurement technique that can perform time-resolved 3D tracking of a particle-seeded fluid. The technique makes use of a single camera equipped with a microlens array, allowing capture of the complete light field. It has the advantage of being simple to set up compared to most other 3D techniques, requiring only a single optical view of the experiment. There are a number of challenges with implementing this technique. The small viewing angle available to this single-camera approach results in difficulty accurately calculating the depths of particles in the fluid. Techniques for addressing this limitation are being investigated. In particular, time-resolved 3D particle tracking has been implemented. Curve fitting along individual particle tracks is used herein to time-average the noise inherent in the depth estimations, with some success. This technique has been tested on the simple case of a steady vortex generated in a vortex chamber. The camera's viewpoint was parallel to the axis of the vortex to maximize the amount of out-of-plane motion that must be resolved by the imaging technique. Overall, this study indicates that implementing focused plenoptic imaging and time-resolved 3DPTV to detect fluid motion may be a viable method for interrogating the 3D motion of a fluid using a single camera.

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