Theoretical modelling studies of gas sensing systems using correlation spectroscopy
Theoretical modelling studies of gas sensing systems using correlation spectroscopy
Monitoring the concentration of gaseous O2, CO2 and CH4 is needed for many environmental, medical and industrial applications. We model the COSM method of correlation spectroscopy, where two broadband light sources are intensity modulated in antiphase, the first being directed via the measurement cell after first passing through the reference sample, the second being more directly-coupled. The subsequent difference in fractional attenuation in the measurement cell indicates the concentration of target gas in this cell. Using data from the HITRAN database, comprehensive analyses are presented to predict the optical modulation index and the signal to noise ratio at the detector, as a function of optical filter properties, and for various gas temperatures and pressures (concentrations). The predicted detection sensitivities are presented for each gas.
Chambers, P.
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Austin, E.A.D.
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Dakin, J.P.
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Chambers, P.
acc1a1f9-dbc8-4d5e-8982-1843cb1beda7
Austin, E.A.D.
49244605-390e-4a67-a184-58434ba30e7c
Dakin, J.P.
04891b9b-5fb5-4245-879e-9e7361adf904
Chambers, P., Austin, E.A.D. and Dakin, J.P.
(2003)
Theoretical modelling studies of gas sensing systems using correlation spectroscopy.
SPIE 5272 : Photonics East 2003: Industrial and Environmental Sensing, Providence, USA.
27 - 31 Oct 2003.
(doi:10.1117/12.536962).
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Conference or Workshop Item
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Abstract
Monitoring the concentration of gaseous O2, CO2 and CH4 is needed for many environmental, medical and industrial applications. We model the COSM method of correlation spectroscopy, where two broadband light sources are intensity modulated in antiphase, the first being directed via the measurement cell after first passing through the reference sample, the second being more directly-coupled. The subsequent difference in fractional attenuation in the measurement cell indicates the concentration of target gas in this cell. Using data from the HITRAN database, comprehensive analyses are presented to predict the optical modulation index and the signal to noise ratio at the detector, as a function of optical filter properties, and for various gas temperatures and pressures (concentrations). The predicted detection sensitivities are presented for each gas.
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e-pub ahead of print date: 2003
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SPIE 5272 : Photonics East 2003: Industrial and Environmental Sensing, Providence, USA, 2003-10-27 - 2003-10-31
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Local EPrints ID: 41581
URI: http://eprints.soton.ac.uk/id/eprint/41581
PURE UUID: 1b0cd27c-c14a-4c76-bcef-83a6491accb0
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Date deposited: 03 Oct 2006
Last modified: 15 Mar 2024 08:31
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Author:
P. Chambers
Author:
E.A.D. Austin
Author:
J.P. Dakin
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