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Determination of surface normal temperature gradients using thermographic phosphors and filtered Rayleigh scattering

Bruebach, J.; Zetterberg, Johan LU ; Omrane, Alaa LU ; Li, Zhongshan LU ; Aldén, Marcus LU and Dreizler, A. (2006) In Applied Physics B 84(3). p.537-541
Abstract
Wall temperature as well as the temperature distribution within or close-by the boundary layer of an electrically heated axisymmetric jet impinging on a flat plate were monitored to deduce wall-normal temperature gradients. The radial surface temperature profile of the plate was determined by coating it with thermographic phosphors (TPs), materials whose phosphorescence decay time is dependent on their temperature. The TP was excited electronically by a frequency-tripled Nd:YAG laser (355 nm) and the temporal decay of the phosphorescence intensity was measured zero-dimensionally by a photomultiplier tube. In this case the 659-nm emission line of Mg3F2GeO4:Mn was monitored. The non-intrusive measurement of gas temperatures near the surface... (More)
Wall temperature as well as the temperature distribution within or close-by the boundary layer of an electrically heated axisymmetric jet impinging on a flat plate were monitored to deduce wall-normal temperature gradients. The radial surface temperature profile of the plate was determined by coating it with thermographic phosphors (TPs), materials whose phosphorescence decay time is dependent on their temperature. The TP was excited electronically by a frequency-tripled Nd:YAG laser (355 nm) and the temporal decay of the phosphorescence intensity was measured zero-dimensionally by a photomultiplier tube. In this case the 659-nm emission line of Mg3F2GeO4:Mn was monitored. The non-intrusive measurement of gas temperatures near the surface was performed two-dimensionally by filtered Rayleigh scattering (FRS). A tunable frequency-tripled single-longitudinal-mode alexandrite laser beam at 254 nm was formed into a light sheet pointing parallel to the surface. The scattered light was imaged through a very narrow linewidth atomic mercury filter onto an intensified charged coupled device (ICCD). The elastic stray light from surfaces was strongly suppressed, whereas Doppler-broadened light was detected. Thermographic phosphors proved to be reliable for the measurement of surface temperatures. Dependent on the specific experimental conditions, problems appeared with signals interfering with the FRS radiation close-by the surface. Results and challenges of this approach are discussed. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Applied Physics B
volume
84
issue
3
pages
537 - 541
publisher
Springer
external identifiers
  • wos:000239394200028
  • scopus:33746828234
ISSN
0946-2171
DOI
10.1007/s00340-006-2243-9
language
English
LU publication?
yes
id
84a53c11-5c1a-4736-b83a-44eaf2420ad4 (old id 399261)
date added to LUP
2007-10-01 10:39:43
date last changed
2019-09-29 03:27:46
@article{84a53c11-5c1a-4736-b83a-44eaf2420ad4,
  abstract     = {Wall temperature as well as the temperature distribution within or close-by the boundary layer of an electrically heated axisymmetric jet impinging on a flat plate were monitored to deduce wall-normal temperature gradients. The radial surface temperature profile of the plate was determined by coating it with thermographic phosphors (TPs), materials whose phosphorescence decay time is dependent on their temperature. The TP was excited electronically by a frequency-tripled Nd:YAG laser (355 nm) and the temporal decay of the phosphorescence intensity was measured zero-dimensionally by a photomultiplier tube. In this case the 659-nm emission line of Mg3F2GeO4:Mn was monitored. The non-intrusive measurement of gas temperatures near the surface was performed two-dimensionally by filtered Rayleigh scattering (FRS). A tunable frequency-tripled single-longitudinal-mode alexandrite laser beam at 254 nm was formed into a light sheet pointing parallel to the surface. The scattered light was imaged through a very narrow linewidth atomic mercury filter onto an intensified charged coupled device (ICCD). The elastic stray light from surfaces was strongly suppressed, whereas Doppler-broadened light was detected. Thermographic phosphors proved to be reliable for the measurement of surface temperatures. Dependent on the specific experimental conditions, problems appeared with signals interfering with the FRS radiation close-by the surface. Results and challenges of this approach are discussed.},
  author       = {Bruebach, J. and Zetterberg, Johan and Omrane, Alaa and Li, Zhongshan and Aldén, Marcus and Dreizler, A.},
  issn         = {0946-2171},
  language     = {eng},
  number       = {3},
  pages        = {537--541},
  publisher    = {Springer},
  series       = {Applied Physics B},
  title        = {Determination of surface normal temperature gradients using thermographic phosphors and filtered Rayleigh scattering},
  url          = {http://dx.doi.org/10.1007/s00340-006-2243-9},
  volume       = {84},
  year         = {2006},
}