DLR-Logo -> http://www.dlr.de
DLR Portal Home | Imprint | Privacy Policy | Contact | Deutsch
Fontsize: [-] Text [+]

Non-uniform optical transfer functions in particle imaging: Calibration and application to Tomographic reconstruction

Schanz, Daniel and Gesemann, Sebastian and Schröder, Andreas and Wieneke, Bernhard and Novara, Matteo (2013) Non-uniform optical transfer functions in particle imaging: Calibration and application to Tomographic reconstruction. Measurement Science and Technology, Vol. 24 (2), pp. 1-16. Institute of Physics (IOP) Publishing. DOI: 10.1088/0957-0233/24/2/024009 ISSN 0957-0233

Full text not available from this repository.

Official URL: http://dx.doi.org/10.1088/0957-0233/24/2/024009


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.

Item URL in elib:https://elib.dlr.de/75701/
Document Type:Article
Additional Information:Meas. Sci. Technol. 24 024009 Published online: 20 December 2012
Title:Non-uniform optical transfer functions in particle imaging: Calibration and application to Tomographic reconstruction
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Wieneke, BernhardLaVision, Göttingen, DUNSPECIFIED
Novara, MatteoDelft University of Technology, The NetherlandsUNSPECIFIED
Journal or Publication Title:Measurement Science and Technology
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In ISI Web of Science:Yes
Volume:Vol. 24
DOI :10.1088/0957-0233/24/2/024009
Page Range:pp. 1-16
Publisher:Institute of Physics (IOP) Publishing
Keywords:Tomographic PIV, Tomographic reconstruction, MART, PTV, particle imaging, weighting function
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Aeronautics
HGF - Program Themes:Aircraft Research (old)
DLR - Research area:Aeronautics
DLR - Program:L AR - Aircraft Research
DLR - Research theme (Project):L - Flight Physics (old)
Location: Göttingen
Institutes and Institutions:Institute of Aerodynamics and Flow Technology > Experimental Methods
Deposited By: Micknaus, Ilka
Deposited On:21 Dec 2012 12:44
Last Modified:06 Sep 2019 15:28

Repository Staff Only: item control page

Help & Contact
electronic library is running on EPrints 3.3.12
Copyright © 2008-2017 German Aerospace Center (DLR). All rights reserved.