Forward and inverse modeling of depth-of-field effects in background-oriented schlieren
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arXiv
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| Hauptverfasser: | , , , , , |
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| Format: | Preprint |
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2024
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| _version_ | 1866911549112713216 |
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| author | Molnar, Joseph P. LaLonde, Elijah J. Combs, Christopher S. Léon, Olivier Donjat, David Grauer, Samuel J. |
| author_facet | Molnar, Joseph P. LaLonde, Elijah J. Combs, Christopher S. Léon, Olivier Donjat, David Grauer, Samuel J. |
| contents | We report a novel "cone-ray" model of background-oriented schlieren (BOS) imaging that accounts for depth-of-field effects. Reconstructions of the density field performed with this model are far more robust to the blur associated with a finite aperture than conventional reconstructions, which presume a "thin-ray" pinhole camera. Our model is characterized and validated using forward evaluations based on simulated and experimental BOS measurements of buoyancy-driven flow and hypersonic flow over a sphere. Moreover, we embed the model in a neural reconstruction algorithm, which is demonstrated with a total variation penalty as well as the compressible Euler equations. Our cone-ray technique dramatically improves the accuracy of BOS reconstructions: the shock interface is well-resolved in all our tests, irrespective of the camera's aperture setting, which spans f-numbers from 22 down to 4. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2402_15954 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Forward and inverse modeling of depth-of-field effects in background-oriented schlieren Molnar, Joseph P. LaLonde, Elijah J. Combs, Christopher S. Léon, Olivier Donjat, David Grauer, Samuel J. Fluid Dynamics We report a novel "cone-ray" model of background-oriented schlieren (BOS) imaging that accounts for depth-of-field effects. Reconstructions of the density field performed with this model are far more robust to the blur associated with a finite aperture than conventional reconstructions, which presume a "thin-ray" pinhole camera. Our model is characterized and validated using forward evaluations based on simulated and experimental BOS measurements of buoyancy-driven flow and hypersonic flow over a sphere. Moreover, we embed the model in a neural reconstruction algorithm, which is demonstrated with a total variation penalty as well as the compressible Euler equations. Our cone-ray technique dramatically improves the accuracy of BOS reconstructions: the shock interface is well-resolved in all our tests, irrespective of the camera's aperture setting, which spans f-numbers from 22 down to 4. |
| title | Forward and inverse modeling of depth-of-field effects in background-oriented schlieren |
| topic | Fluid Dynamics |
| url | https://arxiv.org/abs/2402.15954 |