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Atmospheric Measurement Techniques An interactive open-access journal of the European Geosciences Union

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https://doi.org/10.5194/amt-2017-220
© Author(s) 2017. This work is distributed under
the Creative Commons Attribution 4.0 License.
Research article
07 Aug 2017
Review status
This discussion paper is a preprint. It is a manuscript under review for the journal Atmospheric Measurement Techniques (AMT).
Diode laser based gas analyzer for the simultaneous measurement of CO2 and HF in volcanic plumes
Antonio Chiarugi1,2, Silvia Viciani2, Francesco D'Amato2, and Mike Burton3 1INGV, Pisa, Italy
2CNR – National Institute of Optics, Firenze, Italy
3University of Manchester, School of Earth and Environmental Science, Manchester, UK
Abstract. A portable analyzer, for simultaneous detection of CO2 and HF emitted by volcanoes and fumaroles, is described. The system is based on two fiber coupled Distributed FeedBack lasers and only one multipass cell, and provides the absolute concentration values of the 2 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 setup, to remove all the problems connected with the chemisorption of the HF molecule. The concept, the practical realization and the laboratory performances of the device will be described. Moreover the results obtained during a first test campaign at the crater of Vulcano volcano will be reported, to demonstrate the in-field performances of the spectrometer.

Citation: Chiarugi, A., Viciani, S., D'Amato, F., and Burton, M.: Diode laser based gas analyzer for the simultaneous measurement of CO2 and HF in volcanic plumes, Atmos. Meas. Tech. Discuss., https://doi.org/10.5194/amt-2017-220, in review, 2017.
Antonio Chiarugi et al.
Antonio Chiarugi et al.
Antonio Chiarugi et al.

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Short summary
Assessing the emissions of volcans has a three-fold importance: providing input for climate evolution models (CO2 is one of the major constituents of emissions), quantifying pollutant emissions (HCl, HF and SO2 are released in hundreds of tons/day), and monitoring the status of the magmatic chambers. For these purposes we realized gas analyzers, based on spectroscopic techniques, which must be sensitive, light, resistent to the emitted gases. This paper reports on the measurement of CO2 and HF.
Assessing the emissions of volcans has a three-fold importance: providing input for climate...
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