A diode-laser-based spectrometer for in-situ measurements of volcanic gases

Year: 2004

Authors: Rocco A., De Natale G., De Natale P., Gagliardi G., Gianfrani L.

Autors Affiliation: Istituto Nazionale di Ottica Applicata, Sez. di Napoli, Via Campi Flegrei 34, 80078 Pozzuoli (NA), Italy;
INGV-Osservatorio Vesuviano, Via Diocleziano 328, 80124 Naples, Italy;
Dipartimento Scienze Ambientali, Seconda Università di Napoli and INFM-Gruppo Coordinato Napoli 2, Via Vivaldi 43, 81000 Caserta, Italy

Abstract: We report the first results of the field operation of a novel, portable diode-laser spectrometer for gas-concentration measurements in volcanic areas. Remote detection of direct absorption line shapes was possible thanks to a telecom single-mode optical fiber that delivered radiation from a room-temperature distributed-feedback diode laser, emitting at 1.997 mum, to an open-path multiple-reflection cell, placed on gas effluxes. The system was deployed on two different active volcanoes in Italy, where simultaneous and continuous monitoring of CO2 and H2O concentrations has been demonstrated.


Volume: 78 (2)      Pages from: 235  to: 240

KeyWords: Atmospheric humidity; Chemical sensors; Composition; Concentration (process); Distributed feedback lasers; Electric power utilization; Laser tuning; Light absorption; Light emission; Optical fibers; Photodiodes; Signal to noise ratio; Spectrometers; Stainless steel; Thermocouples; Volcanoes, Remote detection; Volcanic gases, Semiconductor lasers
DOI: 10.1007/s00340-003-1339-8

Citations: 30
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