31 | 31 | || '''14.10.2016''' || '''Claudia Reinlein (Fraunhofer IOF, Jena)''' || '''Active and Adaptive Optics at the Fraunhofer IOF'''[[BR]][[BR]]Active and Adaptive Optics is more and more used in ground-based telescopes and also in discussion for space telescopes. For both types of systems there are completely different technological requirements. While space telescopes mainly aim for active optics, ground-based systems apply both active and adaptive optics.[[BR]][[BR]]This talk describes the technological features and the state of the art of "deformable mirrors / AO systems". And here the focus will be set onto research and development projects of the Fraunhofer IOF (Jena).[[BR]][[BR]]In the framework of an ESA project, a test breadboard is developed, in order to demonstrate the capability to compensate for static aberrations in using active mirrors in space telescopes. In the future, telescopes with a diameter of 4-16m will be used for the search for extraterrestrial life. In this context, IOF develops and investigates an active mirror with "set-and-forget" characteristics to compensate for aberrations conditional of manufacture and assembly. [[BR]][[BR]]For the European Extremely Large Telescope (E-ELT) a technology development for extreme AO (X-AO) is conducted. In this context, the talk will inform about a technological pre-investigation (design) of a deformable mirror with 11000 actuators. [[BR]][[BR]]For laser communication between a ground-station and a geostationary satellite, the pre-compensation of aberrations is a technique to increase the signal intensity at the receiver and to attenuate disturbing speckles. The talk will also present the real-time AO of the Fraunhofer IOF and its compensatory efficiency as a function of the correction angle.[[BR]][[BR]]Presentation: German [[BR]][https://svn.mpia.de/trac/gulli/att/raw-attachment/wiki/AlteVortraege2016S2/2016-10-14_AAO-Fraunhofer.pdf Slides: English][[BR]]Questions: German, English || |
32 | 32 | || '''21.10.2016 '''[[BR]]'''[[span(style=color: #FF0000, HdA-Auditorium!!)]]''' || '''Eike Guenther (TLS, Tautenburg)''' || '''Instrumentation projects of the [[BR]]Thüringer Landessternwarte''' '''Tautenburg '''[[BR]][[BR]]The Thüringer Landessternwarte (TLS) operates a 2m Alfred-Jensch telescope and a LOFAR radio telescope in Tautenburg and is involved in a number of instrumentation projects for various telescopes. In this talk the instrumentation of the telescopes in Tautenburg and other projects are reviewed. [[BR]][[BR]]Although the Alfred-Jensch telescope was built more than 50 years ago, it is continuously upgraded with new instrumentation. Currently in use are a high-resolution Echelle spectrograph, which is used for exoplanet-research, and a low-resolution faint-object spectrograph. Additionally, there is also a CCD camera in the prime-focus, which is used for imaging. Building on the experience with these instruments the TLS also participated in a number of international instrumentation projects. The first one was GROND, a multi-channel camera for the ESO/MPG 2.2m telescope at La Silla. Others were the HERMES spectrograph for the Mercator telescope in La Palma and the two calibration units for CARMENES. Still ongoing is the upgrade of CRIRES to CRIRES+, which is a high-resolution NIR spectrograph for the VLT. Being studied is GTI, a multi-channel camera that is specifically designed for the follow-up observations of exoplanet candidates of TESS and PLATO. [[BR]][[BR]]The TLS also hosts a LOFAR station. LOFAR is the Low-Frequency Array, an instrument for performing radio astronomy in the wavelength range from 1.2 to about 10 m. It is being built by ASTRON, the Netherlands Institute for Radio Astronomy and its international partners, and operated by ASTRON's radio observatory of the Netherlands Organisation for Scientific Research. About 40 stations are located in the Netherlands, additional ones are in Great Britain, France, Sweden, and Germany.[[BR]][[BR]]Presentation: German [[BR]][https://svn.mpia.de/trac/gulli/att/raw-attachment/wiki/AlteVortraege2016S2/2016-10-21_TLS.pdf Slides: English][[BR]]Questions: German, English || |