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8 March 2004 Theoretical modelling studies of gas-sensing systems using correlation spectroscopy
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Proceedings Volume 5272, Industrial and Highway Sensors Technology; (2004)
Event: Optical Technologies for Industrial, Environmental, and Biological Sensing, 2003, Providence, RI, United States
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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Paul Chambers, E. A. D. Austin, and John P. Dakin "Theoretical modelling studies of gas-sensing systems using correlation spectroscopy", Proc. SPIE 5272, Industrial and Highway Sensors Technology, (8 March 2004);

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