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Tomographic reconstruction with non-uniform optical transfer functions (OTF) and an additive SMART approach

Schanz, Daniel and Gesemann, Sebastian and Schröder, Andreas and Wieneke, Bernhard and Michaelis, Dirk (2010) Tomographic reconstruction with non-uniform optical transfer functions (OTF) and an additive SMART approach. 15th International Symposium on Application Laser Techniques to Fluid Mechanics, 05. - 08.07.2010, Lisbon, Portugal.

Full text not available from this repository.

Official URL: http://ltces.dem.ist.utl.pt/lxlaser/lxlaser2010/programme.asp

Abstract

A new approach to the weighting function, which describes particle imaging in the reconstruction process of tomographic PIV, is introduced. Instead of assuming a spatially homogeneous mapping function of a voxel to the images, a variable optical transfer function (OTF) is applied. By this method, the effects of optical distortions, introduced during the recording process, can be reduced considerably. 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, correlation quality and accuracy of the particle peak position. First results on experimental data show a reduction in ghost intensity compared to other approaches. Spatially varying particle imaging is present in nearly all experimental setups to a certain degree. Therefore, the proposed method should yield better results in nearly all applications of tomographic PIV.

Document Type:Conference or Workshop Item (Speech, Paper)
Title:Tomographic reconstruction with non-uniform optical transfer functions (OTF) and an additive SMART approach
Authors:
AuthorsInstitution or Email of Authors
Schanz, DanielUNSPECIFIED
Gesemann, SebastianUNSPECIFIED
Schröder, AndreasUNSPECIFIED
Wieneke, BernhardLaVision, Göttingen, D
Michaelis, DirkLaVision, Göttingen, D
Date:2010
Refereed publication:No
In SCOPUS:No
In ISI Web of Science:No
Page Range:pp. 1-12
Series Name:Conference Proceedings on USB-Stick
Status:Published
Keywords:Tomographic PIV, SMART, mapping function
Event Title:15th International Symposium on Application Laser Techniques to Fluid Mechanics
Event Location:Lisbon, Portugal
Event Type:international Conference
Event Dates:05. - 08.07.2010
HGF - Research field:Aeronautics, Space and Transport (old)
HGF - Program:Aeronautics
HGF - Program Themes:Aircraft Research
DLR - Research area:Aeronautics
DLR - Program:L AR - Aircraft Research
DLR - Research theme (Project):L - Flight Physics
Location: Göttingen
Institutes and Institutions:Institute of Aerodynamics and Flow Technology > Experimental Methods
Deposited By: Ilka Micknaus
Deposited On:23 Jul 2010 11:13
Last Modified:23 Jul 2010 11:13

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