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Gas sensing by tunable multimode diode laser using correlation spectroscopy

Lou, X. T.; Somesfalean, Gabriel LU ; Xu, F.; Zhang, Y. G. and Zhang, Z. G. (2008) In Applied Physics B 93(2-3). p.671-676
Abstract
A novel method to use multimode diode lasers for gas detection is demonstrated. The relationship between the intensity decay of partially absorbed multiple modes and the target gas concentration is presented. The gas concentration is retrieved by a linear-regression-based procedure applied on simultaneously recorded absorption signals in a dual-beam wavelength-modulation configuration. Signals of non-gas origin or disturbed by interfering gases are effectively eliminated by correlation analysis procedure. Light intensity fluctuations and wavelength shifts due to temperature drift are automatically compensated for. Several absorption signals can readily be obtained within a limited tuning range by overlapping the laser multimode chart with... (More)
A novel method to use multimode diode lasers for gas detection is demonstrated. The relationship between the intensity decay of partially absorbed multiple modes and the target gas concentration is presented. The gas concentration is retrieved by a linear-regression-based procedure applied on simultaneously recorded absorption signals in a dual-beam wavelength-modulation configuration. Signals of non-gas origin or disturbed by interfering gases are effectively eliminated by correlation analysis procedure. Light intensity fluctuations and wavelength shifts due to temperature drift are automatically compensated for. Several absorption signals can readily be obtained within a limited tuning range by overlapping the laser multimode chart with the target gas spectrum. This scheme was applied on the detection of trace acetylene mixed in ambient air, and a sensitivity of 3 ppm was achieved with a 48.5 cm path length. The trade-off between sensitivity and reliability for retrieving gas concentration by multiple absorption signals is also presented. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
Ky, 65, 42, Fi, 62, Px, 55
in
Applied Physics B
volume
93
issue
2-3
pages
671 - 676
publisher
Springer
external identifiers
  • wos:000260613600051
  • scopus:55349145914
ISSN
0946-2171
DOI
10.1007/s00340-008-3167-3
language
English
LU publication?
yes
id
22dadfd4-0e30-40b6-82af-769aa5242068 (old id 1283702)
date added to LUP
2009-02-10 10:37:42
date last changed
2017-01-01 04:33:37
@article{22dadfd4-0e30-40b6-82af-769aa5242068,
  abstract     = {A novel method to use multimode diode lasers for gas detection is demonstrated. The relationship between the intensity decay of partially absorbed multiple modes and the target gas concentration is presented. The gas concentration is retrieved by a linear-regression-based procedure applied on simultaneously recorded absorption signals in a dual-beam wavelength-modulation configuration. Signals of non-gas origin or disturbed by interfering gases are effectively eliminated by correlation analysis procedure. Light intensity fluctuations and wavelength shifts due to temperature drift are automatically compensated for. Several absorption signals can readily be obtained within a limited tuning range by overlapping the laser multimode chart with the target gas spectrum. This scheme was applied on the detection of trace acetylene mixed in ambient air, and a sensitivity of 3 ppm was achieved with a 48.5 cm path length. The trade-off between sensitivity and reliability for retrieving gas concentration by multiple absorption signals is also presented.},
  author       = {Lou, X. T. and Somesfalean, Gabriel and Xu, F. and Zhang, Y. G. and Zhang, Z. G.},
  issn         = {0946-2171},
  keyword      = {Ky,65,42,Fi,62,Px,55},
  language     = {eng},
  number       = {2-3},
  pages        = {671--676},
  publisher    = {Springer},
  series       = {Applied Physics B},
  title        = {Gas sensing by tunable multimode diode laser using correlation spectroscopy},
  url          = {http://dx.doi.org/10.1007/s00340-008-3167-3},
  volume       = {93},
  year         = {2008},
}