In recent years, a large number of linear and nonlinear laser-based diagnositic techniques for nonintrusive measurements of species concentrations, temperatures, and gas velocities in a wide pressure and temeprature range with high temeporal and spetial resolution were developed and have become extremely valuable tools to study many aspects of combustion. nOnlinear laser spectroscopic techniques using infrared-visible sum-frequency generation can now bridge the pressure and materials gap to provide kinetic data for catalytic combustion.
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