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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 Platt¹ — ¹Institut 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.