A diode-laser-based spectrometer for in-situ measurements of volcanic gases |
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| Authors: | A?Rocco G?De Natale Email author" target="_blank">P?De NataleEmail author G?Gagliardi L?Gianfrani |
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| Institution: | (1) Istituto Nazionale di Ottica Applicata, Comprensorio Olivetti, Via Campi Flegrei 34, 80078 Pozzuoli Naples, Italy;(2) INGV-Osservatorio Vesuviano, Via Diocleziano 328, 80124 Naples, Italy;(3) Dipartimento di Scienze Ambientali, Seconda Università di Napoli and INFM-Gruppo Coordinato Napoli 2, Via Vivaldi 43, 8100 Caserta, Italy |
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| 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  m, 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. PACS 42.62.Fi; 07.60.Vg; 93.85.+q |
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