In situ combustion measurements of CO2 by use of a distributed-feedback diode-laser sensor near 2.0µm
MetadataShow full item record
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 development of an in situ CO2 combustion diagnostic based on a distributed-feedback diode laser operating near 2.0 um. Calculated absorption spectra of high temperature H2O and CO2 were used to find candidate transitions for CO2 detection, and the R(50) transition at 1.997 um (the v1 + 2v2 + v3 band) was selected on the basis of its line strength and its isolation from interfering high-temperature water absorption. Measurements of spectroscopic parameters such as the line strength, the self-broadening coefficient, and the line position were made for the R(50) transition, and an improved value for the line strength is reported. The combustion-product populations of CO2 in the combustion region above a flat-flame burner were determined in situ to verify the measured spectroscopic parameters and to demonstrate the feasibility of the diode-laser sensor.
M. E. Webber, S. Kim, S. T. Sanders, D. S. Baer, and R. K. Hanson are with the High Temperature Gasdynamics Laboratory, Department of Mechanical Engineering, Stanford University. Ikeda is with the Center for Instrumental Analysis, Department of Mechanical Engineering, Kobe University.