Hybrid Coherent Anti-stokes Raman Scattering for Khz-rate Temperature and Species Measurements in Combusting Flows

Introduction In an effort to reduce pollutant emissions and increase energy efficiency, current clean combustion devices rely on precise control of reaction parameters such as fuel injection rate and reactant mixing. In order to understand, and predict, the effect of these parameters on the overall combustion process, temporallyand spatially-resolved measurements of key thermodynamic properties are required. Although traditional intrusive instrumentation has been used for many years, novel laser-based probes have recently become important tools in combustion research due to their accuracy and non-invasive application [1]. Chief among these is coherent anti-Stokes Raman scattering (CARS) spectroscopy which has been used for accurate temperature and species measurements, on which the reaction kinetics are highly dependent [2].