DPG Phi
Verhandlungen
Verhandlungen
DPG

Hamburg 2009 – wissenschaftliches Programm

Bereiche | Tage | Auswahl | Suche | Downloads | Hilfe

UP: Fachverband Umweltphysik

UP 9: Methoden II

UP 9.3: Vortrag

Donnerstag, 5. März 2009, 17:12–17:24, VMP 8 R206

The SO2 camera - a novel method for quantifying spatial SO2 distributions at high time resolution. — •Markus Woehrbach, Christoph Kern, Leif Vogel, Matthias Fickel, and Ulrich Platt — Institut fuer Umweltphysik, University of Heidelberg, Heidelberg, Germany

Sulfur dioxide (SO2) distributions in volcanic plumes are typically determined via spectroscopic measurements in scanning-mode or through instrument traverses. The SO2 camera system presented here records two-dimensional images of the SO2 distribution at a high temporal resolution and therefore allows the measurement of spatial and temporal variations in the SO2 distribution that can not be resolved by spectroscopic techniques.
For this, two-dimensional images of the volcanic plume are alternately acquired with a UV-sensitive CCD-camera through two selected bandpass filters. The central wavelength of the first filter is chosen around 310 nm, a wavelength region in which SO2 absorption is prominent, while the second filter is transparent at around 325 nm and therefore outside the strong SO2 absorption bands. Intensity ratios of identical picture elements yield the required spectral information for SO2 detection and quantification.
In recent field studies SO2-fluxes up to 2000 t/day could be determined at Mt. Etna, Sicily. A dependency of the absorption signal on the spectral characteristics of the prevalent illumination conditions was discovered, with an observable diurnal variation of roughly 10% for sunny days and high variability for overcast days.

100% | Mobil-Ansicht | English Version | Kontakt/Impressum/Datenschutz
DPG-Physik > DPG-Verhandlungen > 2009 > Hamburg