Two-photon excitation laser-induced fluorescence of carbon monoxide suffers from interference from mainly C₂ and strong pressure quenching. This paper presents an investigation of three excitation/detection schemes for two-photon excitation laser-induced fluorescence on carbon monoxide. The schemes are evaluated for pressure and quenching partner dependencies and C₂ interference. Three different emission bands lie in the Hopefield-Birge system: The Ångström B¹Σ⁺→A¹Π_u band, with two-photon excitation through B¹Σ⁺←X¹Π around 230 nm; the Herzberg band C¹Σ⁺→A¹Π_u, with two-photon excitation through, C¹Σ⁺←X¹Π, around 217 nm; and the third positive group b³Σ→a³Π, also with excitation of B¹Σ⁺←X¹Π around 230 nm. The measurements are performed in laminar premixed flames with various equivalence ratios as well as in a high-pressure cell, where pressure and species concentrations are varied in order to investigate the fluorescence quenching dependence.

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