Chemical and isotopic analysis using diode laser spectroscopy: applications to volcanic gas monitoring

Year: 2002

Authors: Gagliardi G., Restieri R., Casa G., Gianfrani L.

Autors Affiliation: Dipartimento Di Scienze Ambientali Della Seconda, Università Di Napoli, Via Vivaldi 43, I-81100 Caserta, Italy; INFM—Gruppo collegato all’, Università Di Napoli, Italy

Abstract: We report on a diode-laser-based spectrometer, operating at a wavelength of 2 mum, which enables for simultaneous measurements Of CO2 and H2O concentrations in gaseous mixtures with high precision and accuracy. We implemented the very simple approach of a direct measurement of absorption in a multiple reflection cell with a pathlength of 50 m. Gas concentration is simply retrieved from the integrated absorbance, without using calibration cells. The spectrometer is equipped with single-mode optical fibers in order to probe remote environments. The possible application in volcanic areas will be discussed. We also investigated the possibility to measure the isotopic ratio (CO2)-C-13/(CO2)-C-12, which is another relevant parameter for monitoring volcanic activity. (C) 2002 Elsevier Science Ltd. All rights reserved.

Journal/Review: OPTICS AND LASERS IN ENGINEERING

Volume: 37 (2-3)      Pages from: 131  to: 142

KeyWords: Absorption; Carbon dioxide; Chemical analysis; Mixtures; Single mode fibers; Spectrometers; Diode laser spectroscopy; Volcanic gas; Semiconductor lasers
DOI: 10.1016/S0143-8166(01)00081-1

Citations: 22
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