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Proceedings Paper

v3 band of methane molecule with tunable diode laser absorption spectroscopy
Author(s): Mourad Zghal; Mokhtar Saidi; Zohra Ben Lakhdar; Ammar Bouallegue
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Paper Abstract

Tunable diode laser spectrometers are extensively used for the monitoring of trace gases in the atmosphere. We present the results of experimental researches on atmospheric methane concentration, responsible for industrial pollution in Tunisia. Pulsed and tunable, 3.31 micrometers lead salt, single mode, cryogenically cooled diode laser was employed. Evolution of the laser signal corresponding to methane absorption was observed. The gas to be sampled flows through an optical cell or in open-atmosphere-path. Detection was carried out by observing infrared absorption lines. An acquisition system was developed and data were stored and treated online. Traces of methane at the level of 100 ppb could be detected. This gives access to information involving methane concentration in local atmosphere.

Paper Details

Date Published: 29 June 2001
PDF: 6 pages
Proc. SPIE 4430, ROMOPTO 2000: Sixth Conference on Optics, (29 June 2001); doi: 10.1117/12.432901
Show Author Affiliations
Mourad Zghal, Ecole Nationale d'Ingenieurs de Tunis (Tunisia)
Mokhtar Saidi, Lab. de Physique Atomique et Moleculaire (Tunisia)
Zohra Ben Lakhdar, Lab. de Physique Atomique et Moleculaire (Tunisia)
Ammar Bouallegue, Ecole Nationale d'Ingenieurs de Tunis (Tunisia)

Published in SPIE Proceedings Vol. 4430:
ROMOPTO 2000: Sixth Conference on Optics
Valentin I. Vlad, Editor(s)

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