LIF SPECTROSCOPY OF NO AND O-2 IN HIGH-PRESSURE FLAMES

We report new models of absorption, excitation, and fluorescence spect ra for joint excitations of the A<--X(0,0) band of NO and the B<--X ba nds of O-2. Supporting measurements obtained from the burned regions o f flames operated at pressures from 1 to 10 atm are also presented. As developed through these models, a strategy appropriate for imaging pl anar laser-induced flourescence is proposed that, for lean combustion environments, should afford sensitive measurements of NO concentration through the use of a single excitation wavelength despite the photoly tic interference from O-2 that intensities with increasing pressure an d temperature.