Detection of H2O and CO2 with distributed feedback diode lasers: measurement of broadening coefficients and assessment of the accuracy levels for volcanic monitoring
Anno: 1997
Autori: Gianfrani L., Gabrysch M., Corsi C., De Natale P.
Affiliazione autori: Facolta` di Scienze Ambientali, II Universita` di Napoli, Via Arena 22, 81100 Caserta, Italy;
European Laboratory for Nonlinear Spectroscopy, Largo E. Fermi 2, 50125 Firenze, Italy, and Universitat Heidelberg, Physikalisches Institut, Philosophenweg 12, 69120 Heidelberg, Germany;
Dipartimento Scienze Neurologiche, Universita` di Firenze and Istituto Nazionale di Fisica della Materie (INFM), Viale Pieraccini, 50139 Firenze, Italy;
Istituto Nazionale di Ottica, sez. di Napoli, c/o Dipartimento Scienze Fisiche, Mostra d’Oltremare Pad. 19, 80125 Napoli, Italy
Abstract: We reproduced the chemical-physical conditions of fumarolic emission at Phlaegrean Fields, Pozzuoli, Italy, and we measured the CO2 and H2O concentrations using an absorption spectrometer based on two distributed feedback laser diodes at wavelengths of 1.578 and 1.393 mu m. We discuss the accuracy levels of the different methods used. Furthermore, we measured the broadening coefficients for H2O (self-broadening, 28.2 +/- 0.6 MHz/Torr; CO2 broadening, 6.0 +/- 0.4 MHz/Torr) and CO2 (self-broadening, 3.2 +/- 0.1 MHz/Torr; H2O broadening, 4.0 +/- 0.1 MHz/Torr). Using the present data, we evaluated a minimum detectable variation of 9% for H2O and 1% for CO2. (C) 1997 Optical Society of America.
Giornale/Rivista: APPLIED OPTICS
Volume: 36 (36) Da Pagina: 9481 A: 9486
Parole chiavi: Environmental spectroscopy; Molecular spectroscopy; Near-infrared gas sensing; Monitoring; Spectroscopy; Volcanic gasDOI: 10.1364/AO.36.009481Citazioni: 12dati da “WEB OF SCIENCE” (of Thomson Reuters) aggiornati al: 2024-04-28Riferimenti tratti da Isi Web of Knowledge: (solo abbonati) Link per visualizzare la scheda su IsiWeb: Clicca quiLink per visualizzare la citazioni su IsiWeb: Clicca qui