Detection of trace NO concentrations using 1-D NO-LIF imaging

J. Yoo, T. Lee, J. B. Jeffries, R. K. Hanson

Research output: Chapter in Book/Report/Conference proceedingConference contribution


A measurement technique for trace nitric oxide (NO) concentrations in high pressure flames is investigated using 1-D spectrally-resolved imaging via laser-induced fluorescence (LIF). Experiments are performed in premixed methane and argon/oxygen flames with trace amounts of seeded NO (15 to 50ppm) and pressures between 10 to 60bar with an equivalence ratio of 0.9. LIF signals are dispersed with a spectrometer and recorded on a 2-D intensified CCD array yielding spectral resolution on the abscissa and 1-D spatial information on the ordinate. This enables isolation of NO LIF from the interference signals of other species (mainly hot O2 and CO2) while providing spatial resolution along a line. A fast algorithm is developed to evaluate pulse-by-pulse NO concentration from these images. To determine the detection limits for NO concentration and measurement precision, statistical analysis is used to characterize signal-to-noise ratio and shot-toshot fluctuations as a function of laser energy. Results show a single-shot detection limit of <10ppm for all pressure levels for pulse energies extrapolated to ∼16mJ/pulse. The measurement scheme developed here can provide a tool for high-pressure flame chemistry studies and for realtime monitoring of trace NO production in combustion systems.

Original languageEnglish (US)
Title of host publication5th US Combustion Meeting 2007
PublisherCombustion Institute
Number of pages11
ISBN (Electronic)9781604238112
StatePublished - 2007
Externally publishedYes
Event5th US Combustion Meeting 2007 - San Diego, United States
Duration: Mar 25 2007Mar 28 2007

Publication series

Name5th US Combustion Meeting 2007


Other5th US Combustion Meeting 2007
Country/TerritoryUnited States
CitySan Diego

ASJC Scopus subject areas

  • General Chemical Engineering
  • Physical and Theoretical Chemistry
  • Mechanical Engineering


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