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Berlin 2014 – wissenschaftliches Programm

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UP: Fachverband Umweltphysik

UP 2: Methoden - Fernerkundung

UP 2.3: Vortrag

Dienstag, 18. März 2014, 10:45–11:00, MAG 100

A Fabry-Perot Interferometer - based Camera for two-dimensional mapping of SO2 Distributions — •Jonas Kuhn1, Nicole Bobrowski1, Peter Lübcke1, Leif Vogel2, and Ulrich Platt11Institut for Environmental Physics, University of Heidelberg, Germany — 2Earth Observation Science group, Space research Centre, University Leicester, GB

We present a new imaging method for the remote sensing of volcanic gases, which relies on the analysis of regularly spaced narrow-band absorption structures of many small molecules, like SO2, BrO or OClO in the UV-visible spectral region. A Fabry-Perot interferometer (FPI) is used to compare the scattered solar radiance at wavelengths corresponding to absorption bands with the radiance at wavelengths in between the bands, thereby identifying and quantifying the gas. In this first theoretical study, we present sample calculations for the detection of SO2. Optimum values for FPI parameters (finesse, free spectral range) are proposed and possible realisations of such instruments are sketched. Further, the performance of the FPI method is compared to "conventional" SO2 cameras relying on interference filters. We show that camera systems using a FPI potentially achieve a higher sensitivity and are far less influenced by changes in atmospheric radiative transfer. Therefore FPI-based instruments have a great potential as future technique to examine emissions of SO2 (and other gases) from volcanic sources or other point sources.

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