Methane analyzer based on TDL's for measurements in the lower stratosphere: design and laboratory tests

This paper describes a tunable diode laser spectrometer for the in situ measurement of methane by high-resolution absorption spectroscopy of roto-vibrational lines, using a distributed feedback laser emitting in the near infrared (1.65*mm) and a multi-pass cell, with a two-tone detection scheme. The...

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Published inApplied physics. B, Lasers and optics Vol. 75; no. 2-3; pp. 195 - 202
Main Authors D'Amato, F., Mazzinghi, P., Castagnoli, F.
Format Journal Article
LanguageEnglish
Published 01.09.2002
Subjects
Air pollution
Aircraft
Geophysics
Greenhouse effect
In situ measurement
Low weight
Methane
Spectrometers
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Summary:This paper describes a tunable diode laser spectrometer for the in situ measurement of methane by high-resolution absorption spectroscopy of roto-vibrational lines, using a distributed feedback laser emitting in the near infrared (1.65*mm) and a multi-pass cell, with a two-tone detection scheme. The instrument was designed to be installed on the high-altitude aircraft M55 Geophysica, for high-sensitivity and high-temporal-resolution measurement of CH4, both as a greenhouse gas and as a tracer of air-mass motion. The instrument-design criteria to achieve the compactness, low weight, and ruggedness necessary for automatic operation on an unpressurized high-altitude aircraft are reported. Results of the laboratory testing are also shown and discussed.
Bibliography:ObjectType-Article-2
SourceType-Scholarly Journals-1
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ISSN:0946-2171
1432-0649
DOI:10.1007/s00340-002-0981-x