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

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

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) tunin...

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Veröffentlicht in:Applied Optics 1993-10, Vol.32 (30), p.6104-6116
Hauptverfasser: ARROYO, M. P, HANSON, R. K
Format: Artikel
Sprache:eng
Schlagworte:
Applied sciences
Combustion. Flame
Energy
Energy. Thermal use of fuels
Exact sciences and technology
Miscellaneous
Theoretical studies. Data and constants. Metering
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container_title Applied Optics
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creator ARROYO, M. P
HANSON, R. K
description 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 H(2)O 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.
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source Alma/SFX Local Collection; Optica Publishing Group Journals
subjects Applied sciences
Combustion. Flame
Energy
Energy. Thermal use of fuels
Exact sciences and technology
Miscellaneous
Theoretical studies. Data and constants. Metering
title Absorption measurements of water-vapor concentration, temperature, and line-shape parameters using a tunable InGaAsP diode laser
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