H2o absorption spectroscopy for determination of temperature and H2O mole fraction in high-temperature particle synthesis systems
Paul V. Torek, David L. Hall, Tiffany A. Miller, and Margaret S. Wooldridge
Paul V. Torek, David L. Hall, Tiffany A. Miller, and Margaret S. Wooldridge
P. V. Torek, D. L. Hall, T. A. Miller, and M. S. Wooldridge (mswool@umich.edu) are with the Department of Mechanical Engineering, University of Michigan, 2350 Hayward Street, Ann Arbor, Michigan 48109-2125.
Paul V. Torek, David L. Hall, Tiffany A. Miller, and Margaret S. Wooldridge, "H2o absorption spectroscopy for determination of temperature and H2O mole fraction in high-temperature particle synthesis systems," Appl. Opt. 41, 2274-2284 (2002)
Water absorption spectroscopy has been successfully demonstrated as a sensitive and accurate means for in situ determination of temperature and H2O mole fraction in silica (SiO2) particle-forming flames. Frequency modulation of near-infrared emission from a semiconductor diode laser was used to obtain multiple line-shape profiles of H2O rovibrational (ν1 + ν3) transitions in the 7170–7185-cm-1 region. Temperature was determined by the relative peak height ratios, and χH2O was determined by use of the line-shape profiles. Measurements were made in the multiphase regions of silane/hydrogen/oxygen/argon flames to verify the applicability of the diagnostic approach to combustion synthesis systems with high particle loadings. A range of equivalence ratios was studied (ϕ = 0.47–2.15). The results were compared with flames where no silane was present and with adiabatic equilibrium calculations. The spectroscopic results for temperature were in good agreement with thermocouple measurements, and the qualitative trends as a function of the equivalence ratio were in good agreement with the equilibrium predictions. The determinations for water mole fraction were in good agreement with theoretical predictions but were sensitive to the spectroscopic model parameters used to describe collisional broadening. Water absorption spectroscopy has substantial potential as a valuable and practical technology for both research and production combustion synthesis facilities.
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Data taken from HITRAN database.16
Data taken from Toth.19
Collisional-broadening data for H2O broadened by air taken from HITRAN database16 and modified for broadening of H2O by argon after Nagali et al.18 The collisional-broadening parameters were further modified within the error limits stated by Gamache et al.17 Actual values used in the data analysis are listed. Nominal values are listed in parentheses. See text for details.
The temperature dependence to collisional broadening of H2O by argon was assumed equivalent to that for broadening by air. The values for nH2O-air were taken from the HITRAN database16 and modified within the error limits stated by Gamache et al.17 Actual values used in the data analysis are listed. Nominal values are listed in parentheses.
Collisional-broadening data for H2O broadened by H2O taken from HITRAN database16 and modified within the error limits stated by Gamache et al.17 Actual values used in the data analysis are listed. Nominal values are listed in parentheses.
The temperature dependence to collisional broadening of H2O by H2O is taken from Gamache et al.17 and modified within the error limits stated by the authors. Actual values used in the data analysis are listed. Average values of data from Gamache et al.17 are listed in parentheses.
Data taken from HITRAN database.16
Data taken from Toth.19
Collisional-broadening data for H2O broadened by air taken from HITRAN database16 and modified for broadening of H2O by argon after Nagali et al.18 The collisional-broadening parameters were further modified within the error limits stated by Gamache et al.17 Actual values used in the data analysis are listed. Nominal values are listed in parentheses. See text for details.
The temperature dependence to collisional broadening of H2O by argon was assumed equivalent to that for broadening by air. The values for nH2O-air were taken from the HITRAN database16 and modified within the error limits stated by Gamache et al.17 Actual values used in the data analysis are listed. Nominal values are listed in parentheses.
Collisional-broadening data for H2O broadened by H2O taken from HITRAN database16 and modified within the error limits stated by Gamache et al.17 Actual values used in the data analysis are listed. Nominal values are listed in parentheses.
The temperature dependence to collisional broadening of H2O by H2O is taken from Gamache et al.17 and modified within the error limits stated by the authors. Actual values used in the data analysis are listed. Average values of data from Gamache et al.17 are listed in parentheses.