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Title: Volumetric calibration enhancements for single-camera light-field PIV
Authors: Shi, Shengxian
Ding, Junfei
New, Tze How
Liu, You
Zhang, Hanmo
Keywords: Engineering::Mechanical engineering
Issue Date: 2019
Source: Shi, S., Ding, J., New, T. H., Liu, Y., & Zhang, H. (2019). Volumetric calibration enhancements for single-camera light-field PIV. Experiments in Fluids, 60(1), 21-. doi:10.1007/s00348-018-2670-5
Journal: Experiments in Fluids
Abstract: This work presents a volumetric calibration method for single-camera light-field particle image velocimetry (light-field PIV or LF-PIV). The proposed technique makes use of the unique point-like feature of particle light-field images to accurately determine affected pixels for a spatial voxel over a relative large measurement volume. A calibration model is derived based on Gaussian optics, which relates a spatial point light source with its confusion circle produced on microlens array (MLA), and optical distortions are accounted for by introducing five calibration parameters. By taking lens defects and misalignment between MLA and image sensor into account, the calibration method can calculate weighting coefficient for particle image reconstruction more accurately than the theoretical ray-tracing method, especially for regions further away from focal plane where light ray deflections are significant due to optical distortions. The volumetric calibration method was validated by simulation tests using synthetic light-field images, and has been successfully applied to a classic vortex-ring LF-PIV measurement, where the measurable range in depth direction was successfully extended and the quality of reconstructed volumetric velocity field was greatly improved.
ISSN: 0723-4864
DOI: 10.1007/s00348-018-2670-5
Rights: © 2019 Springer-Verlag GmbH Germany, part of Springer Nature. This is a post-peer-review, pre-copyedit version of an article published in Experiments in Fluids. The final authenticated version is available online at:
Fulltext Permission: open
Fulltext Availability: With Fulltext
Appears in Collections:MAE Journal Articles

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