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Quantitative SO2 Detection in Combustion Environments Using Broad Band Ultraviolet Absorption and Laser-Induced Fluorescence

Weng, Wubin LU ; Aldén, Marcus LU and Li, Zhongshan LU (2019) In Analytical Chemistry 91(16). p.10849-10855
Abstract

Spectrally resolved ultraviolet (UV) absorption cross sections of SO2 in combustion environments at temperatures from 1120 to 1950 K were measured for the first time in well-controlled conditions through applying broad band UV absorption spectroscopy in specially designed one-dimensional laminar flat flames. The temperature was observed to have a significant effect on the absorption cross-section profiles at wavelength shorter than 260 nm, while at the longer wavelength side, the absorption cross-section profiles have much less dependence on temperature. The absorption cross section at 277.8 nm with a value of 0.68 × 10-18 cm2/molecule was suggested for the evaluation of the SO2 concentration... (More)

Spectrally resolved ultraviolet (UV) absorption cross sections of SO2 in combustion environments at temperatures from 1120 to 1950 K were measured for the first time in well-controlled conditions through applying broad band UV absorption spectroscopy in specially designed one-dimensional laminar flat flames. The temperature was observed to have a significant effect on the absorption cross-section profiles at wavelength shorter than 260 nm, while at the longer wavelength side, the absorption cross-section profiles have much less dependence on temperature. The absorption cross section at 277.8 nm with a value of 0.68 × 10-18 cm2/molecule was suggested for the evaluation of the SO2 concentration because of the weak dependence on temperature. To make spatially resolved measurements, laser-induced fluorescence (LIF) of SO2 excited by a 266 nm laser was investigated. Spectrally resolved LIF signal was analyzed at different temperatures. The LIF signal showed strong dependence on temperature, which can potentially be used for temperature measurements. At elevated temperatures, spatially resolved LIF SO2 detection up to a few ppm sensitivity was achieved. Combining UV broad band absorption spectroscopy and LIF, highly sensitive and spatially resolved quantitative measurements of SO2 in the combustion environment can be achieved.

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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Analytical Chemistry
volume
91
issue
16
pages
7 pages
publisher
The American Chemical Society (ACS)
external identifiers
  • scopus:85070918084
ISSN
0003-2700
DOI
10.1021/acs.analchem.9b02505
language
English
LU publication?
yes
id
707f2a26-6e37-459a-b599-ca3bb2777d24
date added to LUP
2019-09-03 14:01:55
date last changed
2019-09-26 04:41:17
@article{707f2a26-6e37-459a-b599-ca3bb2777d24,
  abstract     = {<p>Spectrally resolved ultraviolet (UV) absorption cross sections of SO<sub>2</sub> in combustion environments at temperatures from 1120 to 1950 K were measured for the first time in well-controlled conditions through applying broad band UV absorption spectroscopy in specially designed one-dimensional laminar flat flames. The temperature was observed to have a significant effect on the absorption cross-section profiles at wavelength shorter than 260 nm, while at the longer wavelength side, the absorption cross-section profiles have much less dependence on temperature. The absorption cross section at 277.8 nm with a value of 0.68 × 10<sup>-18</sup> cm<sup>2</sup>/molecule was suggested for the evaluation of the SO<sub>2</sub> concentration because of the weak dependence on temperature. To make spatially resolved measurements, laser-induced fluorescence (LIF) of SO<sub>2</sub> excited by a 266 nm laser was investigated. Spectrally resolved LIF signal was analyzed at different temperatures. The LIF signal showed strong dependence on temperature, which can potentially be used for temperature measurements. At elevated temperatures, spatially resolved LIF SO<sub>2</sub> detection up to a few ppm sensitivity was achieved. Combining UV broad band absorption spectroscopy and LIF, highly sensitive and spatially resolved quantitative measurements of SO<sub>2</sub> in the combustion environment can be achieved.</p>},
  author       = {Weng, Wubin and Aldén, Marcus and Li, Zhongshan},
  issn         = {0003-2700},
  language     = {eng},
  month        = {07},
  number       = {16},
  pages        = {10849--10855},
  publisher    = {The American Chemical Society (ACS)},
  series       = {Analytical Chemistry},
  title        = {Quantitative SO<sub>2</sub> Detection in Combustion Environments Using Broad Band Ultraviolet Absorption and Laser-Induced Fluorescence},
  url          = {http://dx.doi.org/10.1021/acs.analchem.9b02505},
  volume       = {91},
  year         = {2019},
}