Laser Absorption Spectroscopy to Probe Chemically Reacting Flows

A.K. Mohamed & M. Lefebvre
Laser absorption spectroscopy is now a well established tool to perform temperature, density and velocity measurements in a wide variety of aerodynamic and combustion flows. Measurements are usually performed on heterogeneous molecules like NO, CO, CO2 and H2O which present strong absorption line strengths in the infrared region due to their high dipole moments. In this paper, we present examples of applications using mid-infrared laser diodes in several hypersonic wind tunnels and combustion facilities of...