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Potential of ensemble-correlation techniques for adaptive PIV processing

Willert, Christian (2008) Potential of ensemble-correlation techniques for adaptive PIV processing. In: Conference Proceedings, Book o. EWA International Workshop on Advanced Measurement Techniques in Aerodynamics, 2008-03-31 - 2008-04-01, Delft (The Netherlands).

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Offizielle URL: http://www.aero.lr.tudelft.nl/~conf08

Kurzfassung

The presentation explores the possibilities of utilizing the statistical information provided through the analysis of PIV image series (not necessarily time-resolved) on the basis of the so-called ensemble-correlation. Originally introduced for the evaluation of micro-PIV images to overcome effects due to Brownian motion and to increase the spatial resolution in spite of sparse seeding, it has received little attention for its possible use in classical macroscopic PIV applications. The main concept behind ensemble correlation is to average cross-correlation planes over many images rather than averaging the extracted displacement vectors. The mean displacement is then obtained from the average correlation planes whose correlation peaks typically have a considerably larger signal-to-noise ratio than the correlation peaks in the correlation data obtained from the individual image pairs. The class of proposed algorithms suggested here uses ensemble correlation on a given PIV image series to recover the mean displacement and in addition evaluates the averaged correlation peak shape to extract detection bounds for processing the individual PIV image pairs. The algorithms inherently offer the capability of spatially varying detection criteria. Further, each individual search mask may be combined with its own weighting function based on the averaged correlation peak shape which provides an additional validation criterion.

Dokumentart:Konferenzbeitrag (Vortrag)
Titel:Potential of ensemble-correlation techniques for adaptive PIV processing
Autoren:
AutorenInstitution oder E-Mail-Adresse der Autoren
Willert, ChristianNICHT SPEZIFIZIERT
Datum:31 März 2008
Erschienen in:Conference Proceedings
Referierte Publikation:Nein
In ISI Web of Science:Nein
Band:Book o
Status:veröffentlicht
Stichwörter:PIV, particle image velocimetry, imaging techniques, flow diagnostics, cross-correlation
Veranstaltungstitel:EWA International Workshop on Advanced Measurement Techniques in Aerodynamics
Veranstaltungsort:Delft (The Netherlands)
Veranstaltungsart:internationale Konferenz
Veranstaltungsdatum:2008-03-31 - 2008-04-01
Veranstalter :Faculty of Aerospace Engineering, TU-Delft
HGF - Forschungsbereich:Luftfahrt, Raumfahrt und Verkehr
HGF - Programm:Luftfahrt
HGF - Programmthema:Antriebe
DLR - Schwerpunkt:Luftfahrt
DLR - Forschungsgebiet:L ER - Antriebsforschung
DLR - Teilgebiet (Projekt, Vorhaben):L - Virtuelles Triebwerk und Validierungsmethoden
Standort: Köln-Porz
Institute & Einrichtungen:Institut für Antriebstechnik
Institut für Antriebstechnik > Triebwerksmesstechnik
Hinterlegt von: Dr.phil. Christian Willert
Hinterlegt am:06 Okt 2008
Letzte Änderung:12 Dez 2013 20:32

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