Imaging of molecular hydrogen and oxygen by single and two-photon fluorescence using laser and flashlamp sources

Diskin, G and Lempert, W. and Miles, R and Kumar, V. and Glesk, Ivan; (1991) Imaging of molecular hydrogen and oxygen by single and two-photon fluorescence using laser and flashlamp sources. In: AIAA 29th Aerospace Meeting. American Institute of Aeronautics and Astronautics, United States.

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Abstract

Two flow visualization techniques, i.e., simultaneous two-dimensional fluorescence imaging of H2 and O2 in a diffusion flame, and quasi-linear fluorescence imaging of O2, are presented. The first uses an injection-locked argon-fluoride excimer laser and a partial overlap of a two-photon ground state absorption in H2 with a single photon absorption from a vibrational level in O2. The second uses a simple, high-intensity ultraviolet flashlamp which provides a flux of photons in the 180-195 nm range, sufficient to produce a quasi-one-dimensional fluorescence image of hot/room temperature oxygen. Both techniques do not require that a seed material be introduced into the flow, they can image major flow constituents, and provide an instantaneous snapshot of the flow.

ORCID iDs

Diskin, G, Lempert, W., Miles, R, Kumar, V. and Glesk, Ivan ORCID logoORCID: https://orcid.org/0000-0002-3176-8069;