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Multi-component chemical analysis of gas mixtures using a continuously tuneable lidar system

Weibring, Petter LU ; Abrahamsson, Christoffer LU ; Sjöholm, Mikael LU ; Smith, JN; Edner, Hans LU and Svanberg, Sune LU (2004) In Applied Physics B 79(4). p.525-530
Abstract
Differential absorption lidar (DIAL) measurements are usually made on single compounds by alternately switching the wavelength between on and off a resonance line. The selection of more than two wavelengths is a mathematical necessity for simultaneous measurement of multiple species or for resolving interference effects between a compound of interest and a background gas such as water vapour or carbon dioxide. This is especially true in the mid-IR region, where many hydrocarbon compounds have important spectral features. We present a method for remote measurement of gas mixtures in the mid-IR region based on a newly developed fast-switching, frequency-agile optical parametric oscillator lidar transmitter. A multivariate statistical... (More)
Differential absorption lidar (DIAL) measurements are usually made on single compounds by alternately switching the wavelength between on and off a resonance line. The selection of more than two wavelengths is a mathematical necessity for simultaneous measurement of multiple species or for resolving interference effects between a compound of interest and a background gas such as water vapour or carbon dioxide. This is especially true in the mid-IR region, where many hydrocarbon compounds have important spectral features. We present a method for remote measurement of gas mixtures in the mid-IR region based on a newly developed fast-switching, frequency-agile optical parametric oscillator lidar transmitter. A multivariate statistical procedure has also been applied for this system, which combines a genetic algorithm for wavelength selection with a partial least squares method for identifying individual compounds from their combined absorption spectrum. A calibration transfer is performed for compounds of interest using reference spectra from an absorption spectra database. Both indoor absorption cell measurements and outdoor remote range resolved measurements of hydrocarbon mixtures were performed to explore the performance of the method. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Applied Physics B
volume
79
issue
4
pages
525 - 530
publisher
Springer
external identifiers
  • wos:000223260300022
  • scopus:4444257627
ISSN
0946-2171
DOI
10.1007/s00340-004-1565-8
language
English
LU publication?
yes
id
26f92c31-b3ea-4c5f-8ba8-e4b04af60e27 (old id 270990)
date added to LUP
2007-10-26 09:45:33
date last changed
2017-09-03 03:35:36
@article{26f92c31-b3ea-4c5f-8ba8-e4b04af60e27,
  abstract     = {Differential absorption lidar (DIAL) measurements are usually made on single compounds by alternately switching the wavelength between on and off a resonance line. The selection of more than two wavelengths is a mathematical necessity for simultaneous measurement of multiple species or for resolving interference effects between a compound of interest and a background gas such as water vapour or carbon dioxide. This is especially true in the mid-IR region, where many hydrocarbon compounds have important spectral features. We present a method for remote measurement of gas mixtures in the mid-IR region based on a newly developed fast-switching, frequency-agile optical parametric oscillator lidar transmitter. A multivariate statistical procedure has also been applied for this system, which combines a genetic algorithm for wavelength selection with a partial least squares method for identifying individual compounds from their combined absorption spectrum. A calibration transfer is performed for compounds of interest using reference spectra from an absorption spectra database. Both indoor absorption cell measurements and outdoor remote range resolved measurements of hydrocarbon mixtures were performed to explore the performance of the method.},
  author       = {Weibring, Petter and Abrahamsson, Christoffer and Sjöholm, Mikael and Smith, JN and Edner, Hans and Svanberg, Sune},
  issn         = {0946-2171},
  language     = {eng},
  number       = {4},
  pages        = {525--530},
  publisher    = {Springer},
  series       = {Applied Physics B},
  title        = {Multi-component chemical analysis of gas mixtures using a continuously tuneable lidar system},
  url          = {http://dx.doi.org/10.1007/s00340-004-1565-8},
  volume       = {79},
  year         = {2004},
}