High resolution volumetric dual-camera light-field PIV
Abstract: Light-field particle image velocimetry (LF-PIV) was recently introduced to measure three-dimensional, three-component velocity field with just a single light-field camera. One of the major challenges lies in the small viewing aperture affecting the depth resolution of such a single-camera...
| Main Authors: | , , , , |
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| Format: | Journal Article |
| Language: | English |
| Published: |
2021
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| Online Access: | https://hdl.handle.net/10356/151484 |
| _version_ | 1811692412961030144 |
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| author | Mei, Di Ding, Junfei Shi, Shengxian New, Tze How Soria, Julio |
| author2 | School of Mechanical and Aerospace Engineering |
| author_facet | School of Mechanical and Aerospace Engineering Mei, Di Ding, Junfei Shi, Shengxian New, Tze How Soria, Julio |
| author_sort | Mei, Di |
| collection | NTU |
| description | Abstract: Light-field particle image velocimetry (LF-PIV) was recently introduced to measure three-dimensional, three-component velocity field with just a single light-field camera. One of the major challenges lies in the small viewing aperture affecting the depth resolution of such a single-camera based LF-PIV approach. In the present study, we show that this limitation may be mitigated by a dual light-field camera framework, one which includes a novel volumetric calibration model derived from Gaussian optics, a particle intensity reconstruction algorithm based on the multiplicative algebraic reconstruction technique and a post-processing technique for the reconstructed particle intensity field. The proposed approach was firstly validated with synthetic light-field particle images as well as experimental light-field images of five tiny glass beads imitating tracer particles. Secondly, parametric studies were conducted to analyze the influence of the viewing angle and seeding particle density on the reconstruction quality and spatial resolution. In particular, synthetic light-field particle images of a direct numerical simulation jet data set were utilized to compare the performance of single- and dual-camera LF-PIV techniques. Finally, experimental volumetric flow field results of a circular vortex-ring were also measured by single- and dual-camera LF-PIV techniques and compared. It is determined here that an additional light-field camera can mitigate the elongation effects of reconstructed particles and improve the measurement resolution in the depth direction. |
| first_indexed | 2024-10-01T06:35:23Z |
| format | Journal Article |
| id | ntu-10356/151484 |
| institution | Nanyang Technological University |
| language | English |
| last_indexed | 2024-10-01T06:35:23Z |
| publishDate | 2021 |
| record_format | dspace |
| spelling | ntu-10356/1514842021-06-17T00:11:00Z High resolution volumetric dual-camera light-field PIV Mei, Di Ding, Junfei Shi, Shengxian New, Tze How Soria, Julio School of Mechanical and Aerospace Engineering Engineering::Mechanical engineering Cameras Velocity Measurement Abstract: Light-field particle image velocimetry (LF-PIV) was recently introduced to measure three-dimensional, three-component velocity field with just a single light-field camera. One of the major challenges lies in the small viewing aperture affecting the depth resolution of such a single-camera based LF-PIV approach. In the present study, we show that this limitation may be mitigated by a dual light-field camera framework, one which includes a novel volumetric calibration model derived from Gaussian optics, a particle intensity reconstruction algorithm based on the multiplicative algebraic reconstruction technique and a post-processing technique for the reconstructed particle intensity field. The proposed approach was firstly validated with synthetic light-field particle images as well as experimental light-field images of five tiny glass beads imitating tracer particles. Secondly, parametric studies were conducted to analyze the influence of the viewing angle and seeding particle density on the reconstruction quality and spatial resolution. In particular, synthetic light-field particle images of a direct numerical simulation jet data set were utilized to compare the performance of single- and dual-camera LF-PIV techniques. Finally, experimental volumetric flow field results of a circular vortex-ring were also measured by single- and dual-camera LF-PIV techniques and compared. It is determined here that an additional light-field camera can mitigate the elongation effects of reconstructed particles and improve the measurement resolution in the depth direction. The authors acknowledge the financial support provided by the National Natural Science Foundation of China (Grant no. 11772197) for the present study. The support of Australian Research Council (ARC) through Discovery and LIEF Grant is also greatly acknowledged. 2021-06-17T00:11:00Z 2021-06-17T00:11:00Z 2019 Journal Article Mei, D., Ding, J., Shi, S., New, T. H. & Soria, J. (2019). High resolution volumetric dual-camera light-field PIV. Experiments in Fluids, 60(8), 132-. https://dx.doi.org/10.1007/s00348-019-2781-7 0723-4864 0000-0003-0048-4837 https://hdl.handle.net/10356/151484 10.1007/s00348-019-2781-7 2-s2.0-85069723502 8 60 132 en Experiments in Fluids © 2019 Springer-Verlag GmbH Germany, part of Springer Nature. All rights reserved. |
| spellingShingle | Engineering::Mechanical engineering Cameras Velocity Measurement Mei, Di Ding, Junfei Shi, Shengxian New, Tze How Soria, Julio High resolution volumetric dual-camera light-field PIV |
| title | High resolution volumetric dual-camera light-field PIV |
| title_full | High resolution volumetric dual-camera light-field PIV |
| title_fullStr | High resolution volumetric dual-camera light-field PIV |
| title_full_unstemmed | High resolution volumetric dual-camera light-field PIV |
| title_short | High resolution volumetric dual-camera light-field PIV |
| title_sort | high resolution volumetric dual camera light field piv |
| topic | Engineering::Mechanical engineering Cameras Velocity Measurement |
| url | https://hdl.handle.net/10356/151484 |
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