Looking into the volcano with a Mid-IR DFB diode laser and Cavity Enhanced Absorption Spectroscopy

S. Kassi; M. Chenevier; L. Gianfrani; A. Salhi; Y. Rouillard; A. Ouvrard; D. Romanini

doi:10.1364/OE.14.011442

Looking into the volcano with a Mid-IR DFB diode laser and Cavity Enhanced Absorption Spectroscopy

S. Kassi^*, M. Chenevier, L. Gianfrani, A. Salhi, Y. Rouillard, A. Ouvrard, D. Romanini

^*Corresponding author for this work

Research output: Contribution to journal › Article › peer-review

59 Citations (Scopus)

Abstract

We report on the first application of extended-wavelength DFB diode lasers to Cavity-Enhanced Absorption Spectroscopy in-situ trace measurements on geothermal gases. The emission from the most active fumarole at the Solfatara volcano near Naples (Italy) was probed for the presence of CO and CH ₄. After passing through a gas dryer and cooler, the volcanic gas flow (98% CO₂) was analysed in real time for the concentration of these species, whose relatively strong absorption lines could be monitored simultaneously by a single Distributed Feed-Back (DFB) GaSb-based diode laser emitting around 2.33μm (4300cm^-1) at room temperature. The concentrations were found to be about 3 ppm and 75ppm, respectively, while actual detection limits for these molecules are around 1 ppb. We discuss the possibility of detecting other species of interest for volcanic emission monitoring.

Original language	English
Pages (from-to)	11442-11452
Number of pages	11
Journal	Optics Express
Volume	14
Issue number	23
DOIs	https://doi.org/10.1364/OE.14.011442
Publication status	Published - Nov 2006
Externally published	Yes

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title = "Looking into the volcano with a Mid-IR DFB diode laser and Cavity Enhanced Absorption Spectroscopy",

abstract = "We report on the first application of extended-wavelength DFB diode lasers to Cavity-Enhanced Absorption Spectroscopy in-situ trace measurements on geothermal gases. The emission from the most active fumarole at the Solfatara volcano near Naples (Italy) was probed for the presence of CO and CH 4. After passing through a gas dryer and cooler, the volcanic gas flow (98% CO2) was analysed in real time for the concentration of these species, whose relatively strong absorption lines could be monitored simultaneously by a single Distributed Feed-Back (DFB) GaSb-based diode laser emitting around 2.33μm (4300cm-1) at room temperature. The concentrations were found to be about 3 ppm and 75ppm, respectively, while actual detection limits for these molecules are around 1 ppb. We discuss the possibility of detecting other species of interest for volcanic emission monitoring.",

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AU - Kassi, S.

AU - Chenevier, M.

AU - Gianfrani, L.

AU - Salhi, A.

AU - Rouillard, Y.

AU - Ouvrard, A.

AU - Romanini, D.

PY - 2006/11

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AB - We report on the first application of extended-wavelength DFB diode lasers to Cavity-Enhanced Absorption Spectroscopy in-situ trace measurements on geothermal gases. The emission from the most active fumarole at the Solfatara volcano near Naples (Italy) was probed for the presence of CO and CH 4. After passing through a gas dryer and cooler, the volcanic gas flow (98% CO2) was analysed in real time for the concentration of these species, whose relatively strong absorption lines could be monitored simultaneously by a single Distributed Feed-Back (DFB) GaSb-based diode laser emitting around 2.33μm (4300cm-1) at room temperature. The concentrations were found to be about 3 ppm and 75ppm, respectively, while actual detection limits for these molecules are around 1 ppb. We discuss the possibility of detecting other species of interest for volcanic emission monitoring.

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Looking into the volcano with a Mid-IR DFB diode laser and Cavity Enhanced Absorption Spectroscopy

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