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

Willert, Christian and Buchmann, Nicolas and 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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Official URL: http://www.aps.org/units/dfd/

Abstract

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.

Document Type:Conference or Workshop Item (Speech)
Title:Tomographic particle image velocimetry using pulsed, high-power LED illumination
Authors:
AuthorsInstitution or Email of Authors
Willert, Christianchris.Willert@dlr.de
Buchmann, NicolasMonash University
Soria, JulioMonash University
Date:19 November 2012
Refereed publication:No
In SCOPUS:No
In ISI Web of Science:No
Status:Published
Keywords:particle image velocimetry, optical flow diagnostics, light emitting diode, overdriven LED, pulsed illumination
Event Title:65th Annual Meeting, American Physical Society, Division of Fluid Dynamics (APS-DFD)
Event Location:San Diego (CA), USA
Event Type:international Conference
Event Dates:18.-20. Nov. 2012
Organizer:American Physical Society
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Aeronautics
HGF - Program Themes:Propulsion Systems
DLR - Research area:Aeronautics
DLR - Program:L ER - Engine Research
DLR - Research theme (Project):L - Virtual Engine and Validation Methods
Location: Köln-Porz
Institutes and Institutions:Institute of Propulsion Technology > Engine Measurement Systems
Deposited By: Dr.phil. Christian Willert
Deposited On:07 Dec 2012 09:33
Last Modified:07 Dec 2012 09:33

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