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Fluorescence-Doped Particles for Simultaneous Temperature and Velocity ImagingPolystyrene latex microspheres (PSLs) have been used for particle image velocimetry (PIV) and laser Doppler velocimetry (LDV) measurements for several decades. With advances in laser technologies, instrumentation, and data processing, the capability to collect more information about fluid flow beyond velocity is possible using new seed materials. To provide additional measurement capability, PSLs were synthesized with temperature-sensitive fluorescent dyes incorporated within the particle. These multifunctional PSLs would have the greatest impact if they could be used in large scale facilities with minimal modification to the facilities or the existing instrumentation. Consequently, several potential dyes were identified that were amenable to existing laser systems currently utilized in wind tunnels at NASA Langley Research Center as well as other wind and fluid (water) tunnels. PSLs incorporated with Rhodamine B, dichlorofluorescein (DCF, also known as fluorescein 548 or fluorescein 27) and other dyes were synthesized and characterized for morphology and spectral properties. The resulting particles were demonstrated to exhibit fluorescent emission, which would enable determination of both fluid velocity and temperature. They also would allow near-wall velocity measurements whereas laser scatter from surfaces currently prevents near-wall measurements using undoped seed materials. Preliminary results in a wind tunnel facility located at Virginia Polytechnic Institute and State University (Virginia Tech) have verified fluorescent signal detection and temperature sensitivity of fluorophore-doped PSLs.
Document ID
20120015850
Acquisition Source
Langley Research Center
Document Type
Technical Memorandum (TM)
Authors
Danehy, Paul M. (NASA Langley Research Center Hampton, VA, United States)
Tiemsin, Pacita I. (NASA Langley Research Center Hampton, VA, United States)
Wohl, Chrostopher J. (NASA Langley Research Center Hampton, VA, United States)
Verkamp, Max (NASA Langley Research Center Hampton, VA, United States)
Lowe, T. (Virginia Polytechnic Inst. and State Univ. Blacksburg, VA, United States)
Maisto, P. (Virginia Polytechnic Inst. and State Univ. Blacksburg, VA, United States)
Byun, G. (Applied Univ. Research, Inc. Blacksburg, VA, United States)
Simpson, R. (Applied Univ. Research, Inc. Blacksburg, VA, United States)
Date Acquired
August 26, 2013
Publication Date
September 1, 2012
Subject Category
Fluid Mechanics And Thermodynamics
Report/Patent Number
NF1676L-15316
L-20182
NASA/TM-2012-217768
Funding Number(s)
WBS: WBS 694478.02.93.02.11.20.23
Distribution Limits
Public
Copyright
Public Use Permitted.

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