High-resolution investigation of degenerate four-wave mixing in the γ(0, 0) band of nitric oxide

Randy Lee Vander Wal, Roger L. Farrow, David J. Rakestraw

Research output: Contribution to journalArticle

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Abstract

We report investigations of degenerate four-wave mixing (DFWM) in the NO A2Σ+←X2Π(ν′=0←ν″=0) band for combustion-diagnostic applications. We have performed high-resolution measurements of DFWM line shapes and intensities with varying foreign-gas pressures and compared the results to simple models. In addition, we have demonstrated the ability to detect flame-generated NO using DFWM, and have tested predictive capabilities of the models by comparing flame spectra to model spectra. Measurements were obtained using a single-mode laser (0.004 cm-1 bandwidth) and a widely tunable multi-mode laser operating near 226 nm. We found that a two-level, moving-absorber model of Abrams et al. [Optical Phase Conjugation, (R. A. Fisher, Ed.), p. 234, Academic Press, 1983] gave an excellent description of DFWM line shapes of NO broadened by He, over a range of pressures spanning the Doppler and collisional broadening regimes. We also investigated the dependence of peak DFWM intensities on foreign-gas pressure, confirming a theoretically predicted rapid decrease in DFWM signal intensities with increasing foreign-gas pressure. However, observed intensities decreased more slowly than predicted. In addition, we observed a greatly reduced pressure dependence when the DFWM signals were strongly saturated. DFWM spectra from thermally generated NO in an H2/O2/N2 diffusion flame were obtained with high signal-to-noise ratio and with relatively low saturation. A comparison of a flame spectrum with a model simulation exhibited excellent agreement. The model used the moving-absorber line-shape model and NO spectral data from the literature, and had no adjusted parameters.

Original languageEnglish (US)
Pages (from-to)1653-1659
Number of pages7
JournalSymposium (International) on Combustion
Volume24
Issue number1
DOIs
StatePublished - Jan 1 1992

Fingerprint

Four wave mixing
Nitric oxide
nitric oxide
four-wave mixing
Nitric Oxide
high resolution
gas pressure
line shape
flames
Gases
laser modes
Laser modes
absorbers
Optical phase conjugation
phase conjugation
diffusion flames
pressure dependence
Signal to noise ratio
signal to noise ratios
bandwidth

All Science Journal Classification (ASJC) codes

  • Chemical Engineering(all)
  • Fuel Technology
  • Energy Engineering and Power Technology
  • Mechanical Engineering
  • Physical and Theoretical Chemistry
  • Fluid Flow and Transfer Processes

Cite this

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title = "High-resolution investigation of degenerate four-wave mixing in the γ(0, 0) band of nitric oxide",
abstract = "We report investigations of degenerate four-wave mixing (DFWM) in the NO A2Σ+←X2Π(ν′=0←ν″=0) band for combustion-diagnostic applications. We have performed high-resolution measurements of DFWM line shapes and intensities with varying foreign-gas pressures and compared the results to simple models. In addition, we have demonstrated the ability to detect flame-generated NO using DFWM, and have tested predictive capabilities of the models by comparing flame spectra to model spectra. Measurements were obtained using a single-mode laser (0.004 cm-1 bandwidth) and a widely tunable multi-mode laser operating near 226 nm. We found that a two-level, moving-absorber model of Abrams et al. [Optical Phase Conjugation, (R. A. Fisher, Ed.), p. 234, Academic Press, 1983] gave an excellent description of DFWM line shapes of NO broadened by He, over a range of pressures spanning the Doppler and collisional broadening regimes. We also investigated the dependence of peak DFWM intensities on foreign-gas pressure, confirming a theoretically predicted rapid decrease in DFWM signal intensities with increasing foreign-gas pressure. However, observed intensities decreased more slowly than predicted. In addition, we observed a greatly reduced pressure dependence when the DFWM signals were strongly saturated. DFWM spectra from thermally generated NO in an H2/O2/N2 diffusion flame were obtained with high signal-to-noise ratio and with relatively low saturation. A comparison of a flame spectrum with a model simulation exhibited excellent agreement. The model used the moving-absorber line-shape model and NO spectral data from the literature, and had no adjusted parameters.",
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High-resolution investigation of degenerate four-wave mixing in the γ(0, 0) band of nitric oxide. / Vander Wal, Randy Lee; Farrow, Roger L.; Rakestraw, David J.

In: Symposium (International) on Combustion, Vol. 24, No. 1, 01.01.1992, p. 1653-1659.

Research output: Contribution to journalArticle

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