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In-Situ Diagnostics of Combustion Parameters Using Laser-Induced Breakdown Spectroscopy

[+] Author Affiliations
T.-W. Lee, N. Hegde, I. Han

Arizona State University, Tempe, AZ

Paper No. HT2005-72517, pp. 713-718; 6 pages
doi:10.1115/HT2005-72517
From:
  • ASME 2005 Summer Heat Transfer Conference collocated with the ASME 2005 Pacific Rim Technical Conference and Exhibition on Integration and Packaging of MEMS, NEMS, and Electronic Systems
  • Heat Transfer: Volume 1
  • San Francisco, California, USA, July 17–22, 2005
  • Conference Sponsors: Heat Transfer Division and Electronic and Photonic Packaging Division
  • ISBN: 0-7918-4731-4 | eISBN: 0-7918-3762-9
  • Copyright © 2005 by ASME

abstract

Laser-Induced breakdown spectroscopy is a powerful diagnostic method that can be applied to combustion systems for measurements of fuel-air ratios, fuel composition, and temperature. In this study, we specifically show the application of LIBS for in-situ flame temperature measurements at conditions up to moderately sooting conditions (equivalence ratio of 15 for methane-air flames). Comparisons with existing data obtained from thermocouple exhibit excellent agreement in weakly sooting flames and good agreement at higher equivalence ratios. The deviation at higher equivalence ratios is attributed to signal trapping due to soot and precursor species and also due to increase in hydrogen spectral signal at these conditions. These are factors that can be circumvented and do not preclude application of LIBS to highly sooting flames.

Copyright © 2005 by ASME

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