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Related Experiment Videos

Quantitative imaging through a spectrograph. 2. Stoichiometry mapping by Raman scattering.

René A L Tolboom1, Nico J Dam, Hans ter Meulen

  • 1Applied Physics Group, Radboud University of Nijmegen, Toernooiveld 1, 6525 ED Nijmegen, The Netherlands.

Applied Optics
|November 13, 2004
PubMed
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Researchers used Bayesian deconvolution with Raman imaging to measure the 2D stoichiometry field in methane-air flames. This technique derives the fuel equivalence ratio from gas concentrations, showing promise for combustion analysis.

Area of Science:

  • Combustion Science
  • Optical Diagnostics
  • Chemical Engineering

Background:

  • Accurate measurement of stoichiometry is crucial for understanding and controlling combustion processes.
  • Raman imaging offers a non-intrusive method for species concentration determination in flames.
  • Previous work established a Bayesian deconvolution algorithm for signal processing.

Purpose of the Study:

  • To apply a Bayesian deconvolution algorithm to Raman imaging data.
  • To measure the two-dimensional stoichiometry field in a combustible methane-air mixture.
  • To assess the feasibility of single-shot Raman imaging for combustion diagnostics.

Main Methods:

  • Utilized Raman imaging through a spectrograph to capture flame emission.
  • Applied a Bayesian deconvolution algorithm to process the spectral data.

Related Experiment Videos

  • Derived stoichiometry (fuel equivalence ratio) from measured number densities of methane and nitrogen.

    • Main Results:

    • Successfully measured the two-dimensional stoichiometry field in a methane-air mixture.
    • Achieved a signal-to-noise ratio of approximately 10 with a 600-laser-shot average.
    • Demonstrated the capability of the algorithm to reconstruct quantitative concentration fields.

    Conclusions:

    • The Bayesian deconvolution algorithm is effective for quantitative analysis of Raman imaging data in combustion.
    • The method provides valuable insights into the spatial distribution of stoichiometry in flames.
    • Further development may enable single-shot measurements for time-resolved combustion studies.