Abstract

Planar laser-induced fluorescence images of O2 in flames have been acquired using an ArF excimer laser as the excitation source. The 193-nm radiation excites several rovibronic lines of the O2 Schumann–Runge (B3uX3g) band system. The resultant fluorescence is detected with an image-intensified 100 × 100 photodiode array camera. Images from several CH4/air flames are presented. High-speed sequences of images have been acquired using the high-repetition-rate capability of the excimer laser. These sequences display the real-time evolution of discrete flame structures. The dependence of the fluorescence signal on temperature and O2 concentration is discussed.

© 1986 Optical Society of America

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