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Related Experiment Videos

Frequency-resolved absorption tomography with tunable diode lasers.

Reynaldo Villarreal1, Philip L Varghese

  • 1Department of Aerospace Engineering an Engineering Mechanics, The University of Texas at Austin, 1 University Station, C0600, Austin, Texas 78712, USA.

Applied Optics
|November 8, 2005
PubMed
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This study demonstrates laser absorption tomography for precise temperature and carbon dioxide (CO2) measurements in flames. The rapid algorithm enables detailed spectral reconstruction for accurate flame analysis.

Area of Science:

  • Combustion Science
  • Laser Spectroscopy
  • Optical Diagnostics

Background:

  • Accurate in-situ measurement of flame properties like temperature and species concentration is crucial for understanding combustion processes.
  • Traditional methods often face challenges with spatial resolution, temporal response, or interference from other species.
  • Laser absorption spectroscopy offers a non-intrusive approach for species quantification and thermometry.

Purpose of the Study:

  • To develop and validate a laser absorption tomography technique for simultaneous measurement of temperature and CO2 mole fraction in an axisymmetric flame.
  • To assess the efficacy of a rapid tomographic inversion algorithm for sparse projection data.
  • To demonstrate the capability of reconstructing detailed spectra at individual radial locations within the flame.

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Main Methods:

  • Utilized a tunable diode laser for absorption measurements near the CO2 R-branch bandhead (4.17 microm).
  • Employed absorption tomography with a rapid tomographic inversion algorithm on an axisymmetric atmospheric pressure flat-flame burner.
  • Performed measurements in methane-air flames, acquiring data at a sparse set of projections.

Main Results:

  • Successfully measured simultaneous profiles of temperature and CO2 mole fraction.
  • The chosen wavelength minimized interference from other combustion species.
  • The rapid inversion algorithm facilitated numerous reconstructions with sparse projection data.
  • Detailed spectra were reconstructed at each radial node, providing high-resolution information.

Conclusions:

  • Laser absorption tomography is a viable technique for simultaneous, spatially resolved temperature and CO2 measurements in flames.
  • The rapid tomographic inversion algorithm is effective for sparse projection data typical in laser absorption tomography.
  • This method offers advantages for detailed spectral reconstruction and flame analysis.