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

Abstract

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
Pages2852-2862
Number of pages11
ISBN (Electronic)9781604238112
StatePublished - Jan 1 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
Volume5

Other

Other5th US Combustion Meeting 2007
CountryUnited States
CitySan Diego
Period3/25/073/28/07

ASJC Scopus subject areas

  • Chemical Engineering(all)
  • Physical and Theoretical Chemistry
  • Mechanical Engineering

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