Tomographic Reconstruction of a 3-D Flow Field Using a Plenoptic Camera

A novel 3-D, 3-C PIV technique is described, based on volume illumination and a plenoptic camera to measure a velocity field. This technique is based on light-field photography, which uses a dense microlens array mounted near a camera sensor to sample the spatial and angular distribution of light entering the camera. Tomographic algorithms (MART) are then used to reconstruct a volumetric intensity field after the image is taken, and cross-correlation algorithms extract the velocity field from the reconstructed volume. This paper provides and introduction to the concepts of light fields and plenoptic photography, and describes the tomographic algorithms used to reconstruct the measurement volume. The first preliminary experimental results on a turbulent boundary layer are presented.

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