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Authors: | Vita, F.* Kern, C.* Inguaggiato, S.* |
Title: | Development of a portable active long-path differential optical absorption spectroscopy system for volcanic gas measurements | Journal: | Journal of sensors and sensor systems | Series/Report no.: | /3(2014) | Publisher: | Copernicus Publications | Issue Date: | 2014 | DOI: | 10.5194/jsss-3-355-2014 | Keywords: | LP-DOAS volcanic gas measurements Vulcano Island sulfur dioxide |
Subject Classification: | 01. Atmosphere::01.01. Atmosphere::01.01.07. Volcanic effects 01. Atmosphere::01.01. Atmosphere::01.01.08. Instruments and techniques 04. Solid Earth::04.08. Volcanology::04.08.01. Gases 04. Solid Earth::04.08. Volcanology::04.08.06. Volcano monitoring 04. Solid Earth::04.08. Volcanology::04.08.07. Instruments and techniques |
Abstract: | Active long-path differential optical absorption spectroscopy (LP-DOAS) has been an effective tool for measuring atmospheric trace gases for several decades. However, instruments were large, heavy and powerinefficient, making their application to remote environments extremely challenging. Recent developments in fibre-coupling telescope technology and the availability of ultraviolet light emitting diodes (UV-LEDS) have now allowed us to design and construct a lightweight, portable, low-power LP-DOAS instrument for use at remote locations and specifically for measuring degassing from active volcanic systems. The LP-DOAS was used to measure sulfur dioxide (SO2) emissions from La Fossa crater, Vulcano, Italy, where column densities of up to 1.2 1018 molec cm2 ( 500 ppmm) were detected along open paths of up to 400m in total length. The instrument’s SO2 detection limit was determined to be 2 1016 molec cm2 ( 8 ppmm), thereby making quantitative detection of even trace amounts of SO2 possible. The instrument is capable of measuring other volcanic volatile species as well. Though the spectral evaluation of the recorded data showed that chlorine monoxide (ClO) and carbon disulfide (CS2/ were both below the instrument’s detection limits during the experiment, the upper limits for the X/ SO2 ratio (XDClO, CS2/ could be derived, and yielded 2 103 and 0.1, respectively. The robust design and versatility of the instrument make it a promising tool for monitoring of volcanic degassing and understanding processes in a range of volcanic systems. |
Appears in Collections: | Article published / in press |
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File | Description | Size | Format | |
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Vita F. et al J Sens Sens Syst_2014.pdf | Main article | 3.63 MB | Adobe PDF | View/Open |
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