Schanz, Daniel und Gesemann, Sebastian und Schröder, Andreas und Wieneke, Bernhard und Novara, Matteo (2013) Non-uniform optical transfer functions in particle imaging: Calibration and application to Tomographic reconstruction. Measurement Science and Technology, Vol. 24 (2), Seiten 1-16. Institute of Physics (IOP) Publishing. doi: 10.1088/0957-0233/24/2/024009. ISSN 0957-0233.
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Offizielle URL: http://dx.doi.org/10.1088/0957-0233/24/2/024009
Kurzfassung
A new approach to the weighting function, which describes particle imaging in tomographic reconstruction, is introduced. Instead of assuming a spatially homogeneous mapping function of voxels to the images, a variable optical transfer function (OTF) is applied. By this method, the negative effects of optical distortions on the reconstruction can be reduced considerably. The effects of these improvements in reconstruction quality on the methods of Tomographic Particle Imaging Velocimetry (TOMO-PIV), as well as 3D-Particle-Tracking are investigated. A method to calibrate the OTF to experimental circumstances is proposed as an additional step to the volume self calibration. It is shown that this kind of calibration is able to capture the predominant particle imaging both for simulated as well as experimental data. The most common distortions of particle imaging are blurring due to a small depth of field and astigmatisms due to imaging optics. The effect of both of these distortions on reconstruction and correlation quality is investigated via simulated data. In both cases, a strong influence on relevant parameters can be seen. Reconstructions using a spatially varying OTF, calibrated to the imaging conditions, show a significant improvement in reconstruction quality and the accuracy of the particle peak position, as well as in the accuracy of the gained displacement vector field when using two timesteps. Evaluation of experimental data by PTV-methods shows a reduction in ghost particle intensity and improvements in peak position accuracy.
elib-URL des Eintrags: | https://elib.dlr.de/75701/ | ||||||||||||||||||||||||
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Dokumentart: | Zeitschriftenbeitrag | ||||||||||||||||||||||||
Zusätzliche Informationen: | Meas. Sci. Technol. 24 024009 Published online: 20 December 2012 | ||||||||||||||||||||||||
Titel: | Non-uniform optical transfer functions in particle imaging: Calibration and application to Tomographic reconstruction | ||||||||||||||||||||||||
Autoren: |
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Datum: | 2013 | ||||||||||||||||||||||||
Erschienen in: | Measurement Science and Technology | ||||||||||||||||||||||||
Referierte Publikation: | Ja | ||||||||||||||||||||||||
Open Access: | Nein | ||||||||||||||||||||||||
Gold Open Access: | Nein | ||||||||||||||||||||||||
In SCOPUS: | Ja | ||||||||||||||||||||||||
In ISI Web of Science: | Ja | ||||||||||||||||||||||||
Band: | Vol. 24 | ||||||||||||||||||||||||
DOI: | 10.1088/0957-0233/24/2/024009 | ||||||||||||||||||||||||
Seitenbereich: | Seiten 1-16 | ||||||||||||||||||||||||
Verlag: | Institute of Physics (IOP) Publishing | ||||||||||||||||||||||||
ISSN: | 0957-0233 | ||||||||||||||||||||||||
Status: | veröffentlicht | ||||||||||||||||||||||||
Stichwörter: | Tomographic PIV, Tomographic reconstruction, MART, PTV, particle imaging, weighting function | ||||||||||||||||||||||||
HGF - Forschungsbereich: | Luftfahrt, Raumfahrt und Verkehr | ||||||||||||||||||||||||
HGF - Programm: | Luftfahrt | ||||||||||||||||||||||||
HGF - Programmthema: | Starrflügler (alt) | ||||||||||||||||||||||||
DLR - Schwerpunkt: | Luftfahrt | ||||||||||||||||||||||||
DLR - Forschungsgebiet: | L AR - Starrflüglerforschung | ||||||||||||||||||||||||
DLR - Teilgebiet (Projekt, Vorhaben): | L - Flugphysik (alt) | ||||||||||||||||||||||||
Standort: | Göttingen | ||||||||||||||||||||||||
Institute & Einrichtungen: | Institut für Aerodynamik und Strömungstechnik > Experimentelle Verfahren | ||||||||||||||||||||||||
Hinterlegt von: | Micknaus, Ilka | ||||||||||||||||||||||||
Hinterlegt am: | 21 Dez 2012 12:44 | ||||||||||||||||||||||||
Letzte Änderung: | 07 Nov 2023 08:39 |
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