Heidelberg 2015 – wissenschaftliches Programm
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Q: Fachverband Quantenoptik und Photonik
Q 46: Laser Applications: Laser Spectroscopy
Q 46.4: Vortrag
Mittwoch, 25. März 2015, 15:15–15:30, K/HS2
Optimization of a capillary Raman system for the high-sensitivity analysis of gas mixtures — •Andreas Off1, Simone Rupp1, Timothy M. James1, Hendrik Seitz-Moskaliuk1, and Helmut H. Telle2 — 1Institute of Technical Physics, Karlsruhe Institute of Technology — 2Instituto Pluridisciplinar, Universidad Complutense de Madrid, Spain
In many applications, e. g. in fusion or in the Karlsruhe Tritium Neutrino Experiment, it is very important to accurately know the composition of the used gases. To determine this composition is a challenging task, for which Raman spectroscopy has proved to be an advantageous analytical method. The measurement is contact-free and does not influence the system. Additionally it is possible to analyze gas mixtures within short measurement periods, measure many constituents simultaneously and to easily discriminate different species. At the Tritium Laboratory Karlsruhe a capillary laser Raman system (CLARA) has been developed to analyze gas mixtures with high sensitivity. First measurements have shown that its performance is already good with a limit of detection of 0.48 mbar in an acquisition time of 5 s. However, the sensitivity of the capillary system is limited by the fluorescence background which is emitted from optical components in the laser beam path.
In this talk optimizations of the setup are presented, which were chosen to decrease the noise while maintaining a high signal. These optimizations include replacing fluorescent components by non- or less fluorescent ones and improvements of the light coupling configuration.