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Mid-infrared polarization spectroscopy: A tool for in situ measurements of toxic gases in smoke-laden environments

Sun, Zhiwei LU ; Forsth, M.; Li, Zhongshan LU ; Li, Bo LU and Aldén, Marcus LU (2011) In Fire and Materials 35(8). p.527-537
Abstract
Infrared polarization spectroscopy (IRPS) was used to detect HCl in an 800 mm long tube furnace. Pieces of a polyvinyl chloride-carpet were continuously fed into the furnace producing a heavy smoke, which is exemplified by the fact that the smoke completely obscured a red laser beam from a He-Ne laser. This constitutes a very harsh environment from a diagnostic point of view due to the high smoke density and relatively long path through the furnace. Despite this it was still possible to measure HCl concentrations in the smoke down to a level of similar to 50ppm using IRPS. The explanation for this success is twofold. First, the IRPS method is inherently almost noise free due to the use of crossed polarizers, creating a virtually zero... (More)
Infrared polarization spectroscopy (IRPS) was used to detect HCl in an 800 mm long tube furnace. Pieces of a polyvinyl chloride-carpet were continuously fed into the furnace producing a heavy smoke, which is exemplified by the fact that the smoke completely obscured a red laser beam from a He-Ne laser. This constitutes a very harsh environment from a diagnostic point of view due to the high smoke density and relatively long path through the furnace. Despite this it was still possible to measure HCl concentrations in the smoke down to a level of similar to 50ppm using IRPS. The explanation for this success is twofold. First, the IRPS method is inherently almost noise free due to the use of crossed polarizers, creating a virtually zero background. Second, the laser beam attenuation due to non-resonant absorption and scattering in the smoke, especially with soot particles, decreases with increasing laser wavelength. Therefore, this type of measurements would have been much more difficult to perform in the visible regime (with wavelengths similar to 0.5 mu m) than in the infrared regime (with wavelengths similar to 3 mu m). Copyright (C) 2010 John Wiley & Sons, Ltd. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
toxicity, HCl, laser diagnostics, mid-infrared polarization, spectroscopy, in situ detection, smoke, soot, steady-state tube furnace
in
Fire and Materials
volume
35
issue
8
pages
527 - 537
publisher
John Wiley & Sons
external identifiers
  • wos:000297154800001
  • scopus:81755162066
ISSN
1099-1018
DOI
10.1002/fam.1071
language
English
LU publication?
yes
id
30b0c8b1-9eb2-4c43-8897-f5e6e9c36976 (old id 2272097)
date added to LUP
2011-12-29 13:35:10
date last changed
2017-01-01 06:03:16
@article{30b0c8b1-9eb2-4c43-8897-f5e6e9c36976,
  abstract     = {Infrared polarization spectroscopy (IRPS) was used to detect HCl in an 800 mm long tube furnace. Pieces of a polyvinyl chloride-carpet were continuously fed into the furnace producing a heavy smoke, which is exemplified by the fact that the smoke completely obscured a red laser beam from a He-Ne laser. This constitutes a very harsh environment from a diagnostic point of view due to the high smoke density and relatively long path through the furnace. Despite this it was still possible to measure HCl concentrations in the smoke down to a level of similar to 50ppm using IRPS. The explanation for this success is twofold. First, the IRPS method is inherently almost noise free due to the use of crossed polarizers, creating a virtually zero background. Second, the laser beam attenuation due to non-resonant absorption and scattering in the smoke, especially with soot particles, decreases with increasing laser wavelength. Therefore, this type of measurements would have been much more difficult to perform in the visible regime (with wavelengths similar to 0.5 mu m) than in the infrared regime (with wavelengths similar to 3 mu m). Copyright (C) 2010 John Wiley & Sons, Ltd.},
  author       = {Sun, Zhiwei and Forsth, M. and Li, Zhongshan and Li, Bo and Aldén, Marcus},
  issn         = {1099-1018},
  keyword      = {toxicity,HCl,laser diagnostics,mid-infrared polarization,spectroscopy,in situ detection,smoke,soot,steady-state tube furnace},
  language     = {eng},
  number       = {8},
  pages        = {527--537},
  publisher    = {John Wiley & Sons},
  series       = {Fire and Materials},
  title        = {Mid-infrared polarization spectroscopy: A tool for in situ measurements of toxic gases in smoke-laden environments},
  url          = {http://dx.doi.org/10.1002/fam.1071},
  volume       = {35},
  year         = {2011},
}