Raffel, Markus und Smith, Nathanial T. und Wolf, Christian und Heineck, James T. und Gardner, Anthony (2024) Projected moving patterns for reference-free background-oriented schlieren technique (BOS). Measurement Science & Technology, 35 (115306), Seiten 2-10. Institute of Physics (IOP) Publishing. doi: 10.1088/1361-6501/ad7165. ISSN 0957-0233.
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Offizielle URL: https://iopscience.iop.org/article/10.1088/1361-6501/ad7165
Kurzfassung
A background-oriented schlieren technique (BOS) using projected background patterns is presented. The projected backgrounds can be scaled to the measurement requirements, providing greater flexibility than printed backgrounds. The evaluation of the BOS image pairs using cross-correlation or optical flow analysis was demonstrated to produce equivalent results. The background pattern can dynamically be shifted by a rotating mirror, allowing evaluation using the reference-free shadowgraphy or reference-free BOS methods. The forward BOS technique is demonstrated, in which a projected speckle pattern is illuminated through a density object and recorded by a camera focused on the screen. In contrast to standard shadowgraphy, where the local image intensity is the parameter proportional the second derivative of density, this technique is robust with respect to varying lighting of the field as long as the displacement of small-scale image structures can be determined.
elib-URL des Eintrags: | https://elib.dlr.de/206245/ | ||||||||||||||||||||||||
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Dokumentart: | Zeitschriftenbeitrag | ||||||||||||||||||||||||
Titel: | Projected moving patterns for reference-free background-oriented schlieren technique (BOS) | ||||||||||||||||||||||||
Autoren: |
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Datum: | 29 August 2024 | ||||||||||||||||||||||||
Erschienen in: | Measurement Science & Technology | ||||||||||||||||||||||||
Referierte Publikation: | Ja | ||||||||||||||||||||||||
Open Access: | Ja | ||||||||||||||||||||||||
Gold Open Access: | Nein | ||||||||||||||||||||||||
In SCOPUS: | Ja | ||||||||||||||||||||||||
In ISI Web of Science: | Ja | ||||||||||||||||||||||||
Band: | 35 | ||||||||||||||||||||||||
DOI: | 10.1088/1361-6501/ad7165 | ||||||||||||||||||||||||
Seitenbereich: | Seiten 2-10 | ||||||||||||||||||||||||
Herausgeber: |
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Verlag: | Institute of Physics (IOP) Publishing | ||||||||||||||||||||||||
ISSN: | 0957-0233 | ||||||||||||||||||||||||
Status: | veröffentlicht | ||||||||||||||||||||||||
Stichwörter: | BOS recording, BOS processing, schlieren technique, laser speckles, density gradients | ||||||||||||||||||||||||
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 - Virtuelles Flugzeug und Validierung | ||||||||||||||||||||||||
Standort: | Göttingen | ||||||||||||||||||||||||
Institute & Einrichtungen: | Institut für Aerodynamik und Strömungstechnik > Hubschrauber, GO | ||||||||||||||||||||||||
Hinterlegt von: | Koch, Bianca | ||||||||||||||||||||||||
Hinterlegt am: | 07 Nov 2024 11:40 | ||||||||||||||||||||||||
Letzte Änderung: | 18 Nov 2024 13:22 |
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