Me. Webber et al., In situ combustion measurements of CO2 by use of a distributed-feedback diode-laser sensor near 2.0 mu m, APPL OPTICS, 40(6), 2001, pp. 821-828
High-resolution absorption measurements of CO2 were made in a heated static
cell and in the combustion region above a flat-flame burner for the develo
pment of an in situ CO2 combustion diagnostic based on a distributed-feedba
ck. diode laser operating near 2.0 mum. Calculated absorption spectra of hi
gh-temperature H2O and CO2 were used to find candidate transitions for CO2
detection, and the R(50) transition at 1.997 mum (the nu (1) + 2 nu (2) + n
u (3) band) was selected on the basis of its line strength and its isolatio
n from interfering high-temperature water absorption. Measurements of spect
roscopic parameters such as the line strength, the self-broadening coeffici
ent, and the line position were made for the R(50) transition, and an impro
ved value for the line strength is reported. The combustion-product populat
ions of CO2 in the combustion region above a flat-flame burner were determi
ned in situ to verify the measured spectroscopic parameters and to demonstr
ate the feasibility of the diode-laser sensor. (C) 2001 Optical Society of
America OCIS codes: 280.1740, 300.6260.