High temperature investigations of methane for the calculation of the temperature dependence of spectral parameters

Michael Lengden, Walter Johnstone, James Roderic Peter Bain, Laura Milne

Research output: Contribution to conferencePoster

Abstract

For gas sensing applications in high temperature environments, such as aeroengine exhaust, solid oxide fuel cells and flames, it is important to have accurate knowledge of the temperature dependence of the spectral parameters used for laser gas composition measurements. Here we present methane spectral measurements for a number of spectral manifolds, taken using direct tunable diode laser spectroscopy, for a temperature range of 50-850°C. The R(4) manifold is of particular interest in this work, as the individual transition assignments vary between the HITRAN2008 database [1], based on the work of Frankenberg [2], and the GOSAT database [3]. Comparative spectra will be shown using parameters from both databases, as will temperature dependence calculations for the self- and nitrogen-broadening parameters. Studies of the R(4) manifold have previously been carried out at high temperatures [4], however, only the HITRAN transitional assignments were used. Furthermore, two ‘hot’ lines have been found in the R(4) manifold that are not present in the work of Gharavi and Buckley [4]. This is because they interrogated a much smaller wavelength range in their work, as they were operating at pressures of ~0.1 bar compared to the atmospheric pressure measurements taken in this work. We provide linestrength and position values for these new transitions.

Conference

Conference8th International Conference on Tunable Diode Laser Spectroscopy
CountrySwitzerland
CityZermatt
Period11/07/1115/07/11

Fingerprint

methane
temperature dependence
high temperature environments
gas composition
pressure measurement
solid oxide fuel cells
laser spectroscopy
flames
atmospheric pressure
diodes
nitrogen
gases
wavelengths
lasers
temperature

Keywords

  • methane
  • gas composition measurements
  • atmospheric pressure measurements
  • spectral parameters

Cite this

Lengden, M., Johnstone, W., Bain, J. R. P., & Milne, L. (2011). High temperature investigations of methane for the calculation of the temperature dependence of spectral parameters. Poster session presented at 8th International Conference on Tunable Diode Laser Spectroscopy, Zermatt, Switzerland.
Lengden, Michael ; Johnstone, Walter ; Bain, James Roderic Peter ; Milne, Laura. / High temperature investigations of methane for the calculation of the temperature dependence of spectral parameters. Poster session presented at 8th International Conference on Tunable Diode Laser Spectroscopy, Zermatt, Switzerland.
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abstract = "For gas sensing applications in high temperature environments, such as aeroengine exhaust, solid oxide fuel cells and flames, it is important to have accurate knowledge of the temperature dependence of the spectral parameters used for laser gas composition measurements. Here we present methane spectral measurements for a number of spectral manifolds, taken using direct tunable diode laser spectroscopy, for a temperature range of 50-850°C. The R(4) manifold is of particular interest in this work, as the individual transition assignments vary between the HITRAN2008 database [1], based on the work of Frankenberg [2], and the GOSAT database [3]. Comparative spectra will be shown using parameters from both databases, as will temperature dependence calculations for the self- and nitrogen-broadening parameters. Studies of the R(4) manifold have previously been carried out at high temperatures [4], however, only the HITRAN transitional assignments were used. Furthermore, two ‘hot’ lines have been found in the R(4) manifold that are not present in the work of Gharavi and Buckley [4]. This is because they interrogated a much smaller wavelength range in their work, as they were operating at pressures of ~0.1 bar compared to the atmospheric pressure measurements taken in this work. We provide linestrength and position values for these new transitions.",
keywords = "methane, gas composition measurements, atmospheric pressure measurements , spectral parameters",
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Lengden, M, Johnstone, W, Bain, JRP & Milne, L 2011, 'High temperature investigations of methane for the calculation of the temperature dependence of spectral parameters' 8th International Conference on Tunable Diode Laser Spectroscopy, Zermatt, Switzerland, 11/07/11 - 15/07/11, .

High temperature investigations of methane for the calculation of the temperature dependence of spectral parameters. / Lengden, Michael; Johnstone, Walter; Bain, James Roderic Peter; Milne, Laura.

2011. Poster session presented at 8th International Conference on Tunable Diode Laser Spectroscopy, Zermatt, Switzerland.

Research output: Contribution to conferencePoster

TY - CONF

T1 - High temperature investigations of methane for the calculation of the temperature dependence of spectral parameters

AU - Lengden, Michael

AU - Johnstone, Walter

AU - Bain, James Roderic Peter

AU - Milne, Laura

PY - 2011/7

Y1 - 2011/7

N2 - For gas sensing applications in high temperature environments, such as aeroengine exhaust, solid oxide fuel cells and flames, it is important to have accurate knowledge of the temperature dependence of the spectral parameters used for laser gas composition measurements. Here we present methane spectral measurements for a number of spectral manifolds, taken using direct tunable diode laser spectroscopy, for a temperature range of 50-850°C. The R(4) manifold is of particular interest in this work, as the individual transition assignments vary between the HITRAN2008 database [1], based on the work of Frankenberg [2], and the GOSAT database [3]. Comparative spectra will be shown using parameters from both databases, as will temperature dependence calculations for the self- and nitrogen-broadening parameters. Studies of the R(4) manifold have previously been carried out at high temperatures [4], however, only the HITRAN transitional assignments were used. Furthermore, two ‘hot’ lines have been found in the R(4) manifold that are not present in the work of Gharavi and Buckley [4]. This is because they interrogated a much smaller wavelength range in their work, as they were operating at pressures of ~0.1 bar compared to the atmospheric pressure measurements taken in this work. We provide linestrength and position values for these new transitions.

AB - For gas sensing applications in high temperature environments, such as aeroengine exhaust, solid oxide fuel cells and flames, it is important to have accurate knowledge of the temperature dependence of the spectral parameters used for laser gas composition measurements. Here we present methane spectral measurements for a number of spectral manifolds, taken using direct tunable diode laser spectroscopy, for a temperature range of 50-850°C. The R(4) manifold is of particular interest in this work, as the individual transition assignments vary between the HITRAN2008 database [1], based on the work of Frankenberg [2], and the GOSAT database [3]. Comparative spectra will be shown using parameters from both databases, as will temperature dependence calculations for the self- and nitrogen-broadening parameters. Studies of the R(4) manifold have previously been carried out at high temperatures [4], however, only the HITRAN transitional assignments were used. Furthermore, two ‘hot’ lines have been found in the R(4) manifold that are not present in the work of Gharavi and Buckley [4]. This is because they interrogated a much smaller wavelength range in their work, as they were operating at pressures of ~0.1 bar compared to the atmospheric pressure measurements taken in this work. We provide linestrength and position values for these new transitions.

KW - methane

KW - gas composition measurements

KW - atmospheric pressure measurements

KW - spectral parameters

UR - http://tdls.conncoll.edu/

M3 - Poster

ER -

Lengden M, Johnstone W, Bain JRP, Milne L. High temperature investigations of methane for the calculation of the temperature dependence of spectral parameters. 2011. Poster session presented at 8th International Conference on Tunable Diode Laser Spectroscopy, Zermatt, Switzerland.