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Stuttgart Mühlhausen, Germany

Meiser S.,German Aerospace Center | Kleine-Buning C.,German Aerospace Center | Uhlig R.,Pfaffenwaldring 38 40 | Lupfert E.,German Aerospace Center | And 2 more authors.
ASME 2012 6th International Conference on Energy Sustainability, ES 2012, Collocated with the ASME 2012 10th International Conference on Fuel Cell Science, Engineering and Technology

Deviations from the ideal shape of reflector panels for parabolic trough solar power plants have relevant impact on field efficiency and thus on the performance of the whole power plant. Analyzing the gravity-induced deformation of mirror shape for different mirror angles is relevant for performance calculation of solar parabolic trough collectors and identifying optimization potential of the mirror panels. Two mirror model versions (stiff and elastic supports) are evaluated in four angles: in horizontal laboratory angle (mirrors facing upward with mounting points horizontally aligned), and in 0°, 45° and 90° collector angle. The resulting slope maps are calculated in a separate post-processing. In order to evaluate the effect of gravity load on mirror shape, the deformed mirror in each evaluated angle is compared to the non-deformed mirror shape, and to the shapes in 0° (zenith) collector angle, respectively. The resulting slope deviation maps show the mirror deformation in different mirror angles. Stiffness of the mounting to the support structure has a relevant impact. Mirror deformation on elastic brackets (SDx up to 1.6 mrad) is much more pronounced than on an ideal stiff support structure (SDx up to 1.0 mrad). Copyright © 2012 by ASME. Source

Humbert L.,Pfaffenwaldring 38 40 | Hampf D.,Pfaffenwaldring 38 40 | Wagner P.,Pfaffenwaldring 38 40 | Sproll F.,Pfaffenwaldring 38 40 | Riede W.,Pfaffenwaldring 38 40
CEAS Space Journal

This work reports the successful implementation of a fiber-based laser transmitter on an already existing astronomical platform. To measure the time of flight for satellite laser ranging applications, pulse energies of a few 10 μJ are sufficient. Optical fibers endure small pulse energies and are therefore suitable to deliver the light from a pulsed laser source to a transmitting telescope. First laser ranging experiments with a pulsed infrared laser source were accomplished to a retroreflector at a distance of 5.3 km with a preliminary uncertainty of 21 cm. © 2015, CEAS. Source

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