Diode laser-based gas analyser for the simultaneous measurement of CO2 and HF in volcanic plumes
Authors: Chiarugi A., Viciani S., D’Amato F., Burton M.
Autors Affiliation: INGV, National Institute for Geophysics and Vulcanology, Pisa, Italy; CNR – National Institute of Optics, Firenze, Italy; University of Manchester, School of Earth and Environmental Science, Manchester, UK
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; VulcanoDOI: 10.5194/amt-11-329-2018Citations: 3data from “WEB OF SCIENCE” (of Thomson Reuters) are update at: 2021-10-17References taken from IsiWeb of Knowledge: (subscribers only)Connecting to view paper tab on IsiWeb: Click hereConnecting to view citations from IsiWeb: Click here