Diode laser-based gas analyser for the simultaneous measurement of CO2 and HF in volcanic plumes

Year: 2018

Authors: Chiarugi A., Viciani S., D’Amato F., Burton M.

Autors Affiliation: Natl Inst Geophys & Vulcanol, INGV, Pisa, Italy; CNR, Natl Inst Opt, Florence, Italy; Univ Manchester, Sch Earth & Environm Sci, Manchester, Lancs, England.

Abstract: A portable analyser is described for simultaneous detection of CO2 and HF emitted by volcanoes and fumaroles. The system is based on two fibre-coupled distributed feedback lasers and only one multipass cell, and provides the absolute concentration values of the two gases, without requiring a calibration procedure, at a maximum rate of 4 Hz. The spectrometer can operate both in a closed-cell configuration and in an open-cell set-up, with the latter mitigating problems associated with chemisorption of the HF molecule. The concept, practical realization and laboratory performance of the device are presented, together with results from a first test campaign measuring volcanic gases emitted from the crater of Vulcano, Italy. We obtained an in-field sensitivity of 320 ppb for CO2 and 20 ppb for HF at 2 s integration time.

Journal/Review: ATMOSPHERIC MEASUREMENT TECHNIQUES

Volume: 11 (1)      Pages from: 329-1  to: 339-11

More Information: Funding sponsor: CO2Volc, 279802. – Acknowledgements. The activity was supported by the FP7-IDEAS-ERC Project CO2Volc (Grant 279802). The authors thank Marco De Pas, Mauro Giuntini and Alessio Montori for the realization of the non-commercial electronics, and Roberto Calzolai and Massimo D’Uva for the realization of mechanics. We greatly appreciate the support of Manuel Queisser, Giuseppe Salerno and Alessandro la Spina in performing the field measurements.
KeyWords: calibration; carbon dioxide; detection method; instrumentation; laboratory method; performance assessment; spectrometer; volcano, Italy; Lipari Islands; Messina [Sicily]; Sicily; Vulcano
DOI: 10.5194/amt-11-329-2018

Citations: 5
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