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Applied Optics

Applied Optics


  • Vol. 32, Iss. 30 — Oct. 20, 1993
  • pp: 6104–6116

Absorption measurements of water-vapor concentration, temperature, and line-shape parameters using a tunable InGaAsP diode laser

M. P. Arroyo and R. K. Hanson  »View Author Affiliations

Applied Optics, Vol. 32, Issue 30, pp. 6104-6116 (1993)

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A tunable diode laser diagnostic based on spectrally resolved laser absorption has been developed to detect water vapor. The system uses a distributed feedback InGaAsP diode laser, emitting at ~ 1.38 μm. The diode laser is tuned in wavelength by modulation of the current, resulting in 1-cm−1 tuning at 80-Hz repetition rate. The directly measured absorption spectra yield values for water-vapor concentration and temperature, as well as a collision-broadening line shape. To our knowledge, we accurately determined required data for H2O line strengths and self-broadening coefficients for several spectral lines in a static cell filled with pure water vapor. The temperature and concentration of the water vapor present in laboratory room air and in the postflame gases above a methane–air flat flame burner have also been measured. These results agree well with calculated values and independent measurements.

© 1993 Optical Society of America

Original Manuscript: September 14, 1992
Published: October 20, 1993

M. P. Arroyo and R. K. Hanson, "Absorption measurements of water-vapor concentration, temperature, and line-shape parameters using a tunable InGaAsP diode laser," Appl. Opt. 32, 6104-6116 (1993)

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