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Two-dimensional imaging of molecular hydrogen in H2–air diffusion flames using two-photon laser-induced fluorescence

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Abstract

We report the use of a tunable ArF laser at 193.26 nm to record simultaneous single-laser-shot, planar images of molecular hydrogen and hot oxygen in a turbulent H2–air diffusion flame. Excitation spectra of fuel and oxidant-rich flame zones confirm a partial overlap of the two-photon H2 (6,0) Q(1) E, FX and single-photon O2 (10,2) R(17) BX (Schumann-Runge) absorption bands. UV Rayleigh scattering images of flame structure and estimated detection limits for the H2 two-photon imaging are also presented.

© 1991 Optical Society of America

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