Abstract

Two-dimensional imaging of CO concentration in combustion gases is demonstrated using two-photon-excited planar laser-induced fluorescence. A quantitative model is presented for the simultaneous two-photon excitation of several rotational transitions of the B¹∑⁺ ← X¹∑⁺ system and the subsequent visible fluorescence (B¹∑⁺ → A¹Π). The model is verified by comparison of predicted and measured excitation spectra and of temperature-corrected relative fluorescence measurements to standard probe measurements of the center line CO distribution in a CO–air diffusion flame. In addition, CO imaging experiments in a premixed methane–air flame indicate the production of C₂ by laser photodissociation of acetylene.

© 1987 Optical Society of America

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