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Authors: Rocco, A.* 
De Natale, G.* 
De Natale, P.* 
Gagliardi, G.* 
Gianfrani, L.* 
Title: A diode-laser-based spectrometer for in-situ measurements of volcanic gases
Issue Date: 2004
Series/Report no.: 78
DOI: 10.1007/s00340-003-1339-8
Keywords: spectrometer
volcanic gases
Subject Classification04. Solid Earth::04.08. Volcanology::04.08.99. General or miscellaneous 
Abstract: We report the first results of the field operation of a novel, portable diode-laser spectrometer for gasconcentration measurements in volcanic areas. Remote detection of direct absorption line shapes was possible thanks to a telecomsingle-mode optical fiber that delivered radiation from a room-temperature distributed-feedback diode laser, emitting at 1.997 µm, 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.
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