UV Raman scattering for flame diagnostics using a krypton fluoride excimer laser

A technique for gas species concentration and temperature measurements, using a KrF excimer laser to produce spontaneous vibrational Raman scattering, is described. The short (20ns) laser pulse length and the increased signal strength, due to the UV laser wavelength, result in single-shot measurements with resolution adequate for supersonic combustion analysis. Simultaneous concentration measurements of all the major species in H;Two KrF excimer lasers are used, a broadband laser (;Dramatic reduction of interference is seen in the Raman flame spectra for a narrowband tunable laser. Proper tuning is determined from OH and O;The narrow bandwidth of the tunable laser allows time-averaged temperature measurements to be made by matching theoretical and experimental Raman spectra. This technique is employed for N;Using a calibrated multi-PMT array for simultaneous measurements, a lifted H...