Scientific Results

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

Year: 2002

Authors: D’Amato F., Mazzinghi P., Castagnoli F.

Autors Affiliation: SIT s.r.l., Via delle Case Dipinte 17, 56100, Pisa Italy;
Istituto Nazionale di Ottica Applicata, Largo E. Fermi 6, 50125 Firenze, Italy;
IFAC-CNR, Via Panciatichi 64, 50127 Firenze, Italy

Abstract: 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 mum) 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.

Journal/Review: APPLIED PHYSICS B-LASERS AND OPTICS

Volume: 75 (2/3)      Pages from: 195  to: 202

KeyWords: Greenhouse effect; Methane; Spectrometers; Spectroscopy, Methane analyzer; Tunable diode laser; Two-tone frequency modulation spectroscopy, Semiconductor lasers
DOI: 10.1007/s00340-002-0981-x

Citations: 16
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