Quantitative Two-Photon LIF (Laser-Induced Fluorescence) Imaging of Carbon Monoxide in Combustion Gases

摘要

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 B to A system and the subsequent visible fluorescence (F to A). 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.