CO Measurements in Combustion Gases by Laser Absorption Spectroscopy and Probe Sampling.
STANFORD UNIV CALIF HIGH TEMPERATURE GASDYNAMICS LAB
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The initial work in a program at Stanford to develop laser-based combustion diagnostics has focused on tunable laser absorption spectroscopy using an infrared diode laser. An important aspect of this program is the validation of the laser technique under controlled conditions and by comparison with established probe-based methods. This paper reports preliminary results from such experiments, which consisted of CO concentration measurements in a flat premixed flame using a tunable diode laser, and both CO and CO2 measurements in a similar flame using an uncooled, aerodynamically quenched quartz sampling probe. CO was chosen for this study for several reasons it is an important flame species whose concentration can be predicted under equilibrium conditions which prevail in the post-flame region of fuel-rich flames its concentration in combustion products can be easily varied from 10 ppm to greater than 10, a range which is compatible with commercial NDIR instruments and it has a well-understood infrared absorption spectrum which simplifies analysis of the absorption measurements.
- Inorganic Chemistry
- Lasers and Masers
- Combustion and Ignition