LASER-INDUCED-FLUORESCENCE DETECTION OF NITRIC-OXIDE IN HIGH-PRESSUREFLAMES WITH A-X(0,2) EXCITATION

Laser-induced fluorescence techniques have been used successfully for quantitative two-dimensional measurements of nitric oxide. The commonl y applied D-X(0, 1) or A-X(0, 0) schemes are restricted to atmospheric -pressure flames and engines driven with gaseous fuels because of stro ng attenuation of the exciting laser beam by combustion intermediates. The properties of a detection scheme for which excitation in the nitr ic oxide A-X(0, 2) band was used were investigated. We discuss the adv antages of the A-X(0, 2) system (excited at 247.95 nm) based on measur ements in laminar premixed methane/air flames at 1-40 bars. (C) 1997 O ptical Society of America.