We report quantitative, spatially resolved laser-saturated fluorescence (LSF), linear laser-induced fluorescence (LIF), and planar laser-induced fluorescence (PLIF) measurements of nitric oxide (NO) concentration in a preheated, lean direct-injection spray flame at atmospheric pressure. The spray is produced by a hollow-cone, pressure-atomized nozzle supplied with liquid heptane, and the overall equivalence ratio is unity. NO is excited by means of the Q2(26.5) transition of the γ(0, 0) band. LSF and LIF detection are performed in a 2-nm region centered on the γ(0, 1) band. PLIF detection is performed in a broad ~70-nm region with a peak transmission at 270 nm. Quantitative radial NO profiles obtained by LSF are presented and analyzed so as to correct similar LIF and PLIF profiles. Excellent agreement is achieved among the three fluorescence methodologies.
© 1998 Optical Society of America
[Optical Society of America ]
(120.0120) Instrumentation, measurement, and metrology : Instrumentation, measurement, and metrology
(280.2470) Remote sensing and sensors : Flames
(300.2530) Spectroscopy : Fluorescence, laser-induced
Clayton S. Cooper, Rayavarapu V. Ravikrishna, and Normand M. Laurendeau, "Comparisons of Laser-Saturated, Laser-Induced, and Planar Laser-Induced Fluorescence Measurements of Nitric Oxide in a Lean Direct-Injection Spray Flame," Appl. Opt. 37, 4823-4833 (1998)