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Tomographic particle image velocimetry using pulsed, high-power LED illumination

Willert, Christian und Buchmann, Nicolas und Soria, Julio (2012) Tomographic particle image velocimetry using pulsed, high-power LED illumination. 65th Annual Meeting, American Physical Society, Division of Fluid Dynamics (APS-DFD), 18.-20. Nov. 2012, San Diego (CA), USA.

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Offizielle URL: http://www.aps.org/units/dfd/

Kurzfassung

High-power light emitting diode (LED) illumination is investigated as an alternative to traditional laser-based Nd:YAG illumination for Tomographic Particle Image Velocimetry (TPIV). Light pulses of significant intensity (1-10 mJ) are obtained by briefly operating the LED at high drive currents and short pulse durations (I_f = 24A, t_p = 150 us). Two LEDs of different wavelengths (green, 525nm; red, 623nm) are investigated with both LEDs providing sufficient pulse energy and image quality to perform reliable TPIV measurements. Volumetric illumination is achieved by direct projection of the LED into the flow, which yields a measurement volume of approximately 8 x 8 x 14 mm^3. The feasibility of this illumination approach is assessed by performing TPIV measurements in homogenous, grid-generated turbulence. in comparison to Nd:YAG laser illumination the absence of laser speckle and excellent pulse-to-pulse stability of the LEDs yield particle image data of high quality with a 3-D displacement measurement uncertainty on the order of 0.2-0.3 pixel. Using an array of LEDs the illuminated volume can be further increased. For instance six high power LEDs are sufficient to illuminate a volume of about 50 x 50 x 10 mm^3.

Dokumentart:Konferenzbeitrag (Vortrag)
Titel:Tomographic particle image velocimetry using pulsed, high-power LED illumination
Autoren:
AutorenInstitution oder E-Mail-Adresse der Autoren
Willert, Christianchris.Willert@dlr.de
Buchmann, NicolasMonash University
Soria, JulioMonash University
Datum:19 November 2012
Referierte Publikation:Nein
In SCOPUS:Nein
In ISI Web of Science:Nein
Status:veröffentlicht
Stichwörter:particle image velocimetry, optical flow diagnostics, light emitting diode, overdriven LED, pulsed illumination
Veranstaltungstitel:65th Annual Meeting, American Physical Society, Division of Fluid Dynamics (APS-DFD)
Veranstaltungsort:San Diego (CA), USA
Veranstaltungsart:internationale Konferenz
Veranstaltungsdatum:18.-20. Nov. 2012
Veranstalter :American Physical Society
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 > Triebwerksmesstechnik
Hinterlegt von: Dr.phil. Christian Willert
Hinterlegt am:07 Dez 2012 09:33
Letzte Änderung:07 Dez 2012 09:33

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