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Applied Optics

Applied Optics

APPLICATIONS-CENTERED RESEARCH IN OPTICS

  • Vol. 38, Iss. 36 — Dec. 20, 1999
  • pp: 7342–7354

Atmospheric CH4 and H2O Monitoring With Near-Infrared InGaAs Laser Diodes by the SDLA, a Balloonborne Spectrometer for Tropospheric and Stratospheric In Situ Measurements

Georges Durry and Gerard Megie  »View Author Affiliations


Applied Optics, Vol. 38, Issue 36, pp. 7342-7354 (1999)
http://dx.doi.org/10.1364/AO.38.007342


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Abstract

The Spectromètre à Diodes Laser Accordables (SDLA), a balloonborne spectrometer devoted to the <i>in situ</i> measurement of CH<sub>4</sub> and H<sub>2</sub>O in the atmosphere that uses commercial distributed-feedback InGaAs laser diodes in combination with differential absorption spectroscopy, is described. Absorption spectra of CH<sub>4</sub> (in the 1.653-μm region) and H<sub>2</sub>O (in the 1.393-μm region) are simultaneously sampled at 1-s intervals by coupling with optical fibers of two near-infrared laser diodes to a Herriott multipass cell open to the atmosphere. Spectra of methane and water vapor in an altitude range of ~1 to ~31 km recorded during the recent balloon flights of the SDLA are presented. Mixing ratios with a precision error ranging from 5% to 10% are retrieved from the atmospheric spectra by a nonlinear least-squares fit to the spectral line shape in conjunction with <i>in situ</i> simultaneous pressure and temperature measurements.

© 1999 Optical Society of America

OCIS Codes
(010.1280) Atmospheric and oceanic optics : Atmospheric composition
(280.3420) Remote sensing and sensors : Laser sensors
(300.1030) Spectroscopy : Absorption
(300.6260) Spectroscopy : Spectroscopy, diode lasers
(300.6340) Spectroscopy : Spectroscopy, infrared
(300.6380) Spectroscopy : Spectroscopy, modulation

Citation
Georges Durry and Gerard Megie, "Atmospheric CH4 and H2O Monitoring With Near-Infrared InGaAs Laser Diodes by the SDLA, a Balloonborne Spectrometer for Tropospheric and Stratospheric In Situ Measurements," Appl. Opt. 38, 7342-7354 (1999)
http://www.opticsinfobase.org/ao/abstract.cfm?URI=ao-38-36-7342

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