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Two-dimensional surface temperature measurements of burning materials

Omrane, Alaa LU ; Ossler, Frederik LU and Aldén, Marcus LU (2002) Twenty-Ninth International Symposium on Combustion Hokkaido University Sapporo Japan In Proceedings of the Combustion Institute 29. p.2653-2659
Abstract
A new technique for two-dimensional temperature measurements of burning surfaces is presented. Laser-induced phosphorescence from a thermographic phosphor material applied to a surface of investigation was measured with a fast framing camera. The phosphor was excited by the 4th harmomic from a pulsed Nd:YAG operating at 10 Hz. The phosphorescence images measured by eight consecutively gated CCD detectors enable pixel-by-pixel lifetime evaluation of the phosphorescence by interpolating an exponential decay curve to the counts of the corresponding pixel positions of the sequential CCD images. The temperature at each pixel position was evaluated using a calibration procedure of temperature against lifetime. These measurement procedures were... (More)
A new technique for two-dimensional temperature measurements of burning surfaces is presented. Laser-induced phosphorescence from a thermographic phosphor material applied to a surface of investigation was measured with a fast framing camera. The phosphor was excited by the 4th harmomic from a pulsed Nd:YAG operating at 10 Hz. The phosphorescence images measured by eight consecutively gated CCD detectors enable pixel-by-pixel lifetime evaluation of the phosphorescence by interpolating an exponential decay curve to the counts of the corresponding pixel positions of the sequential CCD images. The temperature at each pixel position was evaluated using a calibration procedure of temperature against lifetime. These measurement procedures were used for surface temperature measurements of the evolution of flame spread on low-density fiber boards. The results from experiments showed the possibility of measuring surface temperature during all phases of the flame spread. The total time window used for each two-dimensional temperature measurement was 800 mus to obtain high accuracy and precision at high temperatures, 680-780 K, temperatures characteristic of burning surfaces. The best precision, better than +/-5 K, was obtained at these temperatures. In this region, evaluation by the lifetime method shows a higher sensitivity to temperature than what can be expected from methods based on spectral line intensities. The results of the experiments were in accordance with those reported from previous one-point measurements. In the low-temperature region close to room temperature, the accuracy deteriorated considerably. The results obtained from the two-dimensional imaging experiments are presented and discussed. (Less)
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author
organization
publishing date
type
Chapter in Book/Report/Conference proceeding
publication status
published
subject
keywords
Surface temperature
in
Proceedings of the Combustion Institute
volume
29
pages
2653 - 2659
publisher
Elsevier
conference name
Twenty-Ninth International Symposium on Combustion Hokkaido University Sapporo Japan
external identifiers
  • wos:000182866500150
  • scopus:84939445495
ISSN
0082-0784
DOI
10.1016/S1540-7489(02)80323-6
language
English
LU publication?
yes
id
3fc95d3b-2f51-458b-817f-5c8dc48a97de (old id 310809)
date added to LUP
2007-11-28 13:04:41
date last changed
2017-09-10 04:36:25
@inproceedings{3fc95d3b-2f51-458b-817f-5c8dc48a97de,
  abstract     = {A new technique for two-dimensional temperature measurements of burning surfaces is presented. Laser-induced phosphorescence from a thermographic phosphor material applied to a surface of investigation was measured with a fast framing camera. The phosphor was excited by the 4th harmomic from a pulsed Nd:YAG operating at 10 Hz. The phosphorescence images measured by eight consecutively gated CCD detectors enable pixel-by-pixel lifetime evaluation of the phosphorescence by interpolating an exponential decay curve to the counts of the corresponding pixel positions of the sequential CCD images. The temperature at each pixel position was evaluated using a calibration procedure of temperature against lifetime. These measurement procedures were used for surface temperature measurements of the evolution of flame spread on low-density fiber boards. The results from experiments showed the possibility of measuring surface temperature during all phases of the flame spread. The total time window used for each two-dimensional temperature measurement was 800 mus to obtain high accuracy and precision at high temperatures, 680-780 K, temperatures characteristic of burning surfaces. The best precision, better than +/-5 K, was obtained at these temperatures. In this region, evaluation by the lifetime method shows a higher sensitivity to temperature than what can be expected from methods based on spectral line intensities. The results of the experiments were in accordance with those reported from previous one-point measurements. In the low-temperature region close to room temperature, the accuracy deteriorated considerably. The results obtained from the two-dimensional imaging experiments are presented and discussed.},
  author       = {Omrane, Alaa and Ossler, Frederik and Aldén, Marcus},
  booktitle    = {Proceedings of the Combustion Institute},
  issn         = {0082-0784},
  keyword      = {Surface temperature},
  language     = {eng},
  pages        = {2653--2659},
  publisher    = {Elsevier},
  title        = {Two-dimensional surface temperature measurements of burning materials},
  url          = {http://dx.doi.org/10.1016/S1540-7489(02)80323-6},
  volume       = {29},
  year         = {2002},
}