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On the Occurrence of Systematic Errors in Cross-Correlation based Measurements for Aerodynamics

Blumrich, Frederik (2010) On the Occurrence of Systematic Errors in Cross-Correlation based Measurements for Aerodynamics. 27th International Congress of the Aeronautical Sciences (ICAS 2010), 19.-24. Sept. 2010, Nice, France.

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The scope of this paper is the investigation of sub-pixel displacement estimation in crosscorrelation based measurement techniques used in aerodynamics. We will show, that a systematic error will occur when using one-dimensional sub-pixel displacement estimation algorithms to decompose elliptically shaped correlation peaks. First, an analytical description of this error will be derived and it will be shown, that it can lead to a systematic influence of more than one pixel. Additionally, a general linear two-dimensional Gaussian algorithm based on least squares estimation will be presented to allow for sub-pixel displacement estimation of elliptically shaped correlation peaks without any significant bias error. The performance of the here presented algorithms for sub-pixel displacement estimation, as well as algorithms provided by commercial software packages, will be tested with artificial image pairs of random dot patterns.

Item URL in elib:https://elib.dlr.de/65792/
Document Type:Conference or Workshop Item (Speech, Paper)
Title:On the Occurrence of Systematic Errors in Cross-Correlation based Measurements for Aerodynamics
AuthorsInstitution or Email of AuthorsAuthor's ORCID iDORCID Put Code
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In ISI Web of Science:No
Series Name:CD Conference Proceedings
Keywords:sub-pixel, displacement estimation, cross-correlation, particle image velocimetry, least squares estimation
Event Title:27th International Congress of the Aeronautical Sciences (ICAS 2010)
Event Location:Nice, France
Event Type:international Conference
Event Dates:19.-24. Sept. 2010
HGF - Research field:Aeronautics, Space and Transport (old)
HGF - Program:Aeronautics
HGF - Program Themes:Aircraft Research (old)
DLR - Research area:Aeronautics
DLR - Program:L AR - Aircraft Research
DLR - Research theme (Project):L - Concepts & Integration (old)
Location: Köln-Porz , Göttingen
Institutes and Institutions:Executive Board > Vorstandsbüro
Institute of Aerodynamics and Flow Technology > Experimental Methods
Deposited By: Micknaus, Ilka
Deposited On:05 Nov 2010 13:20
Last Modified:19 Nov 2010 09:49

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