SMuK 2021 – wissenschaftliches Programm
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UP: Fachverband Umweltphysik
UP 4: Measurement Techniques & Miscellaneous
UP 4.2: Vortrag
Freitag, 3. September 2021, 11:15–11:30, H7
Fabry-Perot interferometer correlation spectroscopy - A novel technique for the imaging of atmospheric trace gases — •Jaro Heimann1, Alexander Nies1, Christopher Fuchs1, Jonas Kuhn1,2, Nicole Bobrowski1,2, and Ulrich Platt1,2 — 1Institute of Environmental Physics, Heidelberg University, Germany — 2Max Planck Institute for Chemistry, Mainz, Germany
Imaging of trace gases by optical remote sensing provides insights into the dynamics of physical and chemical processes within the atmosphere. However, dispersive techniques cannot resolve many processes on their intrinsic spatial and temporal scale, e.g. Imaging DOAS. Non-dispersive imaging techniques, e.g. SO2 cameras, reach high spatial and temporal resolution, but due to their strongly restricted spectral information they show cross-interferences with other trace gases (e.g. O3), aerosols, and clouds. We introduce a novel imaging technique for atmospheric trace gases, based on the application of a Fabry-Perot interferometer (FPI). The FPIs periodic transmission is matched to the periodicity of the vibronic narrowband absorption structure of the target trace gas absorption yielding high trace gas selectivity and thereby allowing a more precise determination of gas emission fluxes. The instrument response can be modelled using absorption cross sections and a solar atlas spectrum from the literature thereby avoiding additional calibration procedures, e.g. using gas cells. We present recent measurements which were performed at Mt. Etna for SO2 with an imaging Fabry-Perot interferometer correlation spectroscopy (IFPICS) instrument with a detection limit of 3e17 molec/cm2.