Changes between Version 322 and Version 323 of AstroTechTalk
- Timestamp:
- 4 Dec 2017, 14:48:49 (6 years ago)
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AstroTechTalk
v322 v323 35 35 || '''17.11.2017[[BR]](10hrs, HdA)''' || '''Hans J. Kaercher (MT Mechatronics GmbH)''' || '''Thinking in Forces [[BR]](as a Tool for designing Telescope Structures)'''[[BR]][[BR]]What is a force? One can start reflecting about it and philosophers have written whole books about this question. Ludwig Buechner, a „middle-class materialist“ of the 19th century wrote in his book „Kraft und Stoff“: „Kraft kann nichts weiter sein als eine Eigenschaft der Materie“, or „Kräfte lassen sich nicht mitteilen, sondern nur wecken“, and in this sense he is obviously with Isaac Newton, who is the originator of "thinking in forces" following his famous observation of the falling apple. Much later this led to the special engineering branch "structural mechanics", which was originally applied to bridge and building construction, lateron even in the more sophisticated branch of aerospace engineering.[[BR]][[BR]]„Thinking in forces“ in the form of "graphical structural analysis" became a branch of engineering in the middle of the 19th century. This enables to think in both the "physical space" and the "force space", i.e. besides a design drawing also a force diagram is required. This is similar to projective geometry, where also dual spaces exist. Hans Kaercher will explain this approach in three examples:[[BR]]1) designing reflectors for radio telescopes;[[BR]]2) designing primary mirror supports for large optical telescopes;[[BR]]3) designing tracking mounts for large optical elements.[[BR]]These examples will be discussed in the framework of design contributions to different telescope projects, like e.g. the radio telescope LMT/GTM, the IR telescope SOFIA and the optical telescope ELT.[[BR]][[BR]]Presentation: German[[BR]][https://svn.mpia.de/trac/gulli/att/raw-attachment/wiki/AlteVortraege2017S2/2017-11-17_DenkenInKraeften.pdf Slides: English][[BR]]Questions: German, English || 36 36 || 24.11.2017[[BR]](10hrs, HdA) || || || 37 || '''01.12.2017[[BR]](10hrs, HdA)''' || '''Thomas Henning''' || '''Perspectives in Astronomy'''[[BR]][[BR]]The talk will discuss the new and currently investigated U.S. initiatives for large space missions. In this context a special focus will be set onto the characterization of extrasolar planets. [[BR]][[BR]]Presentation: German[[BR]][https://svn.mpia.de/trac/gulli/att/raw-attachment/wiki/AlteVortraege2017S2/2017-12-01_Perspektiven.pdf Slides: English][[BR]]Questions: German, English ||37 || '''01.12.2017[[BR]](10hrs, HdA)''' || '''Thomas Henning''' || '''Perspectives in Astronomy'''[[BR]][[BR]]The talk will discuss the new and currently investigated U.S. initiatives for large space missions. In this context a special focus will be set onto the characterization of extrasolar planets. [[BR]][[BR]]Presentation: German[[BR]][https://svn.mpia.de/trac/gulli/att/raw-attachment/wiki/AlteVortraege2017S2/2017-12-01_Perspektiven.pdf Slides: German][[BR]]Questions: German, English || 38 38 || '''08.12.2017[[BR]](10hrs, HdA)''' || '''Philipp Hottinger (ZAH, LSW)''' || '''3D-printed microlens-array as tip-tilt sensor[[BR]]'''[[BR]]In this talk Philipp Hottinger introduces the possibility to use a microlens-array (MLA) as tip-tilt sensor device with integrated single mode fiber coupling. A first prototype has been presented by Dietrich & Harris et al. (2017) and is directly printed onto a multi-core fiber consisting of 7 single mode cores. [[BR]][[BR]]Philipp Hottinger will present his ongoing work on further development of this device. This includes characterization, modeling and on-sky requirements for upcoming testing at the iLocater spectrograph at the LBT.[[BR]][[BR]]Presentation: German[[BR]][https://svn.mpia.de/trac/gulli/att/raw-attachment/wiki/AlteVortraege2017S2/2017-12-08_TipTilt.pdf Slides: English][[BR]]Questions: German, English || 39 39 || '''15.12.2017[[BR]](10hrs, HdA)''' || '''Olivier Absil (Université de Liège)''' || '''Five years of harvest with the vortex coronagraph[[BR]]'''[[BR]]While the concept of vortex coronagraphy dates back to 2005, the first science-grade Annular Groove Phase Masks (AGPM), working in the thermal infrared regime, have been installed at the VLT only in 2012. They are now also equipping the Keck telescope and the Large Binocular Telescope, and will soon be at the core of more ground-based high-contrast imaging instruments. [[BR]][[BR]]In this talk, Olivier Absil will shortly review the technology development undertaken over the last 10 years, and describe the on-sky operations and performance of the vortex coronagraph. He will then present the main scientific results obtained since 2012, and explain how his team has recently adapted deep learning techniques to the problem of post-processing in high-contrast imaging. He will finally discuss the perspectives with new instruments, including the Breakthrough Watch project.[[BR]][[BR]]Presentation: English[[BR]][https://svn.mpia.de/trac/gulli/att/raw-attachment/wiki/AlteVortraege2017S2/2017-12-15_HCI.pdf Slides: English][[BR]]Questions: German, English ||
