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Strategy for improved NH2 detection in combustion environments using an Alexandrite laser.

Christian Brackmann1, Bo Zhou1, Per Samuelsson1

  • 1Division of Combustion Physics, Lund University, Box 118, SE-221 00 Lund, Sweden.

Spectrochimica Acta. Part A, Molecular and Biomolecular Spectroscopy
|May 15, 2017
PubMed
Summary

A new laser-induced fluorescence (LIF) method enhances detection of the amidogen radical (NH2) in flames. This technique offers a ~15x stronger signal, improving combustion chemistry analysis.

Keywords:
CombustionLaser-induced fluorescenceNH(2) radical

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Area of Science:

  • Chemical Physics
  • Combustion Science
  • Laser Spectroscopy

Background:

  • Accurate detection of the amidogen radical (NH2) is crucial for understanding fuel-nitrogen combustion chemistry.
  • Previous laser-induced fluorescence (LIF) schemes for NH2 detection had limitations in signal strength and spectral accessibility.
  • The spectral region around 385nm offers potential for improved NH2 detection using readily available laser technology.

Purpose of the Study:

  • To present and validate a new LIF scheme for NH2 detection using excitation around 385nm.
  • To compare the performance of the new scheme with existing methods for NH2 diagnostics.
  • To assess the potential of the new method for quantitative NH2 imaging in combustion environments.

Main Methods:

  • Utilized laser-induced fluorescence (LIF) with excitation at approximately 385nm, employing the second harmonic of a solid-state Alexandrite laser.
  • Measured fluorescence excitation and dispersed emission spectra in premixed NH3-air flames and NH3 photolysis experiments.
  • Performed spectral simulations to aid in the identification of NH2 spectral lines and potential interferences.

Main Results:

  • Confirmed NH2 detection via characteristic spectral lines in both flame and photolysis experiments.
  • Observed a continuous spectral structure in flames, dependent on nitrogen addition, also attributed to NH2.
  • Achieved a ~15-fold increase in NH2 signal compared to a previous 630nm excitation scheme.
  • Demonstrated single-shot NH2 LIF imaging in flame with a signal-to-noise ratio of 3 at ~1000ppm, suggesting a detection limit around 700ppm.
  • Found no evidence of fluorescence saturation or laser-induced photochemistry at laser irradiances up to 0.2 GW/cm2.

Conclusions:

  • The 385nm excitation LIF scheme provides significantly enhanced NH2 signal for improved diagnostics.
  • Careful consideration of fluorescence interferences is necessary for accurate NH2 measurements in this spectral region.
  • The developed method offers advanced capabilities for characterizing fuel-nitrogen combustion chemistry and enabling quantitative NH2 imaging.