Raffel, Markus und Smith, Nathanial T. und Wolf, Christian und Heineck, James T. und Gardner, Anthony (2022) Generation and evalutaion of projected moving patterns for reference-free BOS with increased spatial resolution. In: 20th International Symposium on the Application of Laser and Imaging Techniques to Fluid Mechanics. 20th International Symposium on the Application of Laser and Imaging Techniques to Fluid Mechanics, 2022-07-11 - 2022-07-14, Lissabon, Portugal.
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Offizielle URL: http://lisbon-lasersymposium.org/LXLASER2022/
Kurzfassung
A method of taking background oriented schlieren technique (BOS) images using projected backgrounds is shown. The projected backgrounds can be scaled to the measurement requirements, providing more flexibility than printed backgrounds. The evaluation of the BOS image pairs using cross correlation or optical flow analysis was shown to produce equivalent results. The background can be dynamically moved using a rotating mirror, allowing evaluation using the reference-free shadowgraphy or reference-free BOS methods. Forward BOS is shown, where the projected speckle pattern shines through the density object onto a screen, and is recorded by a camera focused on the screen. In contrast to standard shadowgraphy, this technique is robust when the lighting of the field is uneven, and the point movement is related to the first derivative of density.
elib-URL des Eintrags: | https://elib.dlr.de/186832/ | ||||||||||||||||||||||||
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Dokumentart: | Konferenzbeitrag (Vortrag) | ||||||||||||||||||||||||
Zusätzliche Informationen: | Vortrag mit Paper | ||||||||||||||||||||||||
Titel: | Generation and evalutaion of projected moving patterns for reference-free BOS with increased spatial resolution | ||||||||||||||||||||||||
Autoren: |
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Datum: | Juli 2022 | ||||||||||||||||||||||||
Erschienen in: | 20th International Symposium on the Application of Laser and Imaging Techniques to Fluid Mechanics | ||||||||||||||||||||||||
Referierte Publikation: | Ja | ||||||||||||||||||||||||
Open Access: | Nein | ||||||||||||||||||||||||
Gold Open Access: | Nein | ||||||||||||||||||||||||
In SCOPUS: | Nein | ||||||||||||||||||||||||
In ISI Web of Science: | Nein | ||||||||||||||||||||||||
Status: | veröffentlicht | ||||||||||||||||||||||||
Stichwörter: | BOS recording, BOS processing, schlieren technique, laser speckles, density gradients | ||||||||||||||||||||||||
Veranstaltungstitel: | 20th International Symposium on the Application of Laser and Imaging Techniques to Fluid Mechanics | ||||||||||||||||||||||||
Veranstaltungsort: | Lissabon, Portugal | ||||||||||||||||||||||||
Veranstaltungsart: | internationale Konferenz | ||||||||||||||||||||||||
Veranstaltungsbeginn: | 11 Juli 2022 | ||||||||||||||||||||||||
Veranstaltungsende: | 14 Juli 2022 | ||||||||||||||||||||||||
HGF - Forschungsbereich: | Luftfahrt, Raumfahrt und Verkehr | ||||||||||||||||||||||||
HGF - Programm: | Luftfahrt | ||||||||||||||||||||||||
HGF - Programmthema: | Effizientes Luftfahrzeug | ||||||||||||||||||||||||
DLR - Schwerpunkt: | Luftfahrt | ||||||||||||||||||||||||
DLR - Forschungsgebiet: | L EV - Effizientes Luftfahrzeug | ||||||||||||||||||||||||
DLR - Teilgebiet (Projekt, Vorhaben): | L - Virtueller Hubschrauber und Validierung | ||||||||||||||||||||||||
Standort: | Göttingen | ||||||||||||||||||||||||
Institute & Einrichtungen: | Institut für Aerodynamik und Strömungstechnik > Hubschrauber, GO | ||||||||||||||||||||||||
Hinterlegt von: | Carter, Beatrice | ||||||||||||||||||||||||
Hinterlegt am: | 03 Aug 2022 13:24 | ||||||||||||||||||||||||
Letzte Änderung: | 24 Apr 2024 20:48 |
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