Carbon dioxide UV laser-induced fluorescence in high-pressure flames

✍ Scribed by W.G. Bessler; C. Schulz; T. Lee; J.B. Jeffries; R.K. Hanson

• Publisher: Elsevier Science
• Year: 2003
• Tongue: English
• Weight: 351 KB
• Volume: 375
• Category: Article
• ISSN: 0009-2614
• DOI: 10.1016/s0009-2614(03)00858-3

✦ Synopsis

Laser-induced fluorescence (LIF) of carbon dioxide is investigated with excitation between 215 and 255 nm with spectrally resolved detection in 5-40 bar premixed CH 4 /O 2 /Ar and CH 4 /air flat-flames at fuel/air ratios between 0.8 and 1.9. The LIF signal consists of a broad (200-450 nm) continuum with a faint superimposed structure, and this signal is absent in similar H 2 /O 2 /Ar flames. There is strong evidence this signal arises from CO 2 , as the signal variations with excitation wavelength, equivalence ratio and flame temperature all correlate with CO 2 absorption cross-sections. The signal is linear with pressure and laser fluence within the investigated ranges.