Open Multipass Absorption Cell for In Situ Monitoring of Stratospheric Trace Gas with Telecommunication Laser Diodes
Applied Optics, Vol. 41, Issue 3, pp. 424-433 (2002)
http://dx.doi.org/10.1364/AO.41.000424
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Abstract
A two-mirror multipass absorption cell that is operated open to the atmosphere from a stratospheric balloon to monitor in situ methane (in the 1.65-μm region) and water vapor (in the 1.39-μm region) with telecommunication laser diodes is described. A small Cassegrain-type telescope is used to couple the cell simultaneously with two near-infrared InGaAsP laser diodes by means of optical fibers. The 1-m cell provides an absorption path length of 56 m. The optical cell was carefully designed to be free of incidental fringing in the 10−5 absorption range. It is used in combination with a dual-beam detector to obtain a detection limit of 10−5 absorption units, a large dynamic range of the measurements of many orders of magnitude, and a precision error in the concentration determination of a few percents. The optical arrangement of the cell and its ability to be used to detect in situ trace gas in the stratosphere, in severe environmental conditions, are exposed.
© 2002 Optical Society of America
[Optical Society of America ]
OCIS Codes
(010.1280) Atmospheric and oceanic optics : Atmospheric composition
(120.4570) Instrumentation, measurement, and metrology : Optical design of instruments
(120.6200) Instrumentation, measurement, and metrology : Spectrometers and spectroscopic instrumentation
(300.1030) Spectroscopy : Absorption
(300.6260) Spectroscopy : Spectroscopy, diode lasers
(300.6340) Spectroscopy : Spectroscopy, infrared
Citation
Georges Durry, Théodore Danguy, and Ivan Pouchet, "Open Multipass Absorption Cell for In Situ Monitoring of Stratospheric Trace Gas with Telecommunication Laser Diodes," Appl. Opt. 41, 424-433 (2002)
http://www.opticsinfobase.org/ao/abstract.cfm?URI=ao-41-3-424
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