Mr. Josef Richter Profile

Josef Richter

at Univ-Sternwarte München

SPIE Involvement:

Author

Publications (15)

Proceedings Article | 13 December 2020 Poster + Presentation + Paper

Poster + Presentation + Paper

Multifocal station for the Wendelstein 2m Fraunhofer Telescope

Kerstin Krecker, Maximilian Fabricius, Ralf Bender, Vanessa Fahrenschon, Hubert Gebler, Claus Gössl, Frank Grupp, Oliver Hans, Marco Häuser, Ulrich Hopp, Hanna Kellermann, Florian Lang-Bardl, Wolfgang Mitch, Josef Richter, Surangkhana Rukdee, Roberto Saglia, Sami Wirthensohn

Proceedings Volume 11447, 1144763 (2020) https://doi.org/10.1117/12.2560940

KEYWORDS: Telescopes, Imaging systems, Cameras, Spectrographs, Velocity measurements, Wavefront sensors, Sensor calibration, Calibration, Optical design, Mechanical engineering

Read Abstract +

Proceedings Article | 30 July 2018 Open Access

Open Access

Paper

The MICADO first light imager for the ELT: overview, operation, simulation

R. Davies, J. Alves, Y. Clénet, F. Lang-Bardl, H. Nicklas, J.-U. Pott, R. Ragazzoni, E. Tolstoy, P. Amico, H. Anwand-Heerwart, S. Barboza, L. Barl, P. Baudoz, R. Bender, N. Bezawada, P. Bizenberger, W. Boland, P. Bonifacio, B. Borgo, T. Buey, F. Chapron, F. Chemla, M. Cohen, O. Czoske, V. Déo, K. Disseau, S. Dreizler, O. Dupuis, M. Fabricius, R. Falomo, P. Fedou, N. Förster Schreiber, V. Garrel, N. Geis, H. Gemperlein, E. Gendron, R. Genzel, S. Gillessen, M. Glück, F. Grupp, M. Hartl, M. Häuser, H.-J. Hess, R. Hofferbert, U. Hopp, V. Hörmann, Z. Hubert, E. Huby, J.-M. Huet, V. Hutterer, D. Ives, A. Janssen, W. Jellema, W. Kausch, F. Kerber, H. Kravcar, B. Le Ruyet, K. Leschinski, C. Mandla, M. Manhart, D. Massari, S. Mei, F. Merlin, L. Mohr, A. Monna, N. Muench, F. Müller, G. Musters, R. Navarro, U. Neumann, N. Neumayer, J. Niebsch, M. Plattner, N. Przybilla, S. Rabien, R. Ramlau, J. Ramos, S. Ramsay, P. Rhode, A. Richter, J. Richter, H.-W. Rix, G. Rodeghiero, R.-R. Rohloff, M. Rosensteiner, G. Rousset, J. Schlichter, J. Schubert, A. Sevin, R. Stuik, E. Sturm, J. Thomas, N. Tromp, G. Verdoes-Kleijn, F. Vidal, R. Wagner, M. Wegner, W. Zeilinger, J. Ziegleder, B. Ziegler, G. Zins

Proceedings Volume 10702, 107021S (2018) https://doi.org/10.1117/12.2311483

KEYWORDS: Adaptive optics, Distortion, Planets

Read Abstract +

Proceedings Article | 27 July 2018 Paper

Paper

MICADO instrument control approach in context of ESO ELT standards

Marco Haeuser, Joerg Schlichter, Hans-Joachim Hess, Helmut Kravcar, Josef Richter, Michael Wegner

Proceedings Volume 10702, 107028Z (2018) https://doi.org/10.1117/12.2312048

KEYWORDS: Control systems, Photonic integrated circuits, Sensors, Cryogenics, Detector arrays, Telecommunications, Imaging systems, Adaptive optics, Calibration, Control systems design

Read Abstract +

MICADO will equip the ELT with a first light capability for diffraction limited imaging at near-infrared wave- lengths. The instrument’s observing modes focus on various flavours of imaging, including astrometric, high contrast, and time resolved. There is also a single object spectroscopic mode optimised for wavelength coverage at moderately high resolution.1 Due to ESO’s technology standards evolution from VLT to ELT, MICADO will manifest the combined, PLC based soft- and hardware control. The evolution of ESO’s technology design guidelines is on the one hand triggered by the ongoing developments in modern days industry and consumer tech- nology. On the other hand, ELT’s sheer dimensions request increasingly complex and smart solutions onwards controlling and monitoring such huge instruments. ESO’s control concept is based on a two layer approach: PLCs are responsible for low-level hardware control (in a real-time fashion, if necessary), while software running on a Linux workstation implements the astronomic business logic of the control system. Development is eased by the fact that ESO delivers libraries for the control of many standard hardware components. A very interesting feature of this approach is the possibility to run C++ code natively inside a PLC real-time environment. This will be used for the control of complex mechanisms like the MICADO Atmoshperic Dispersion Corrector (ADC). This contribution provides an overview of the key functionality of the instrument focusing on the mechanisms inside the cryostat, and an overview of the cryogenic control. Because of hardware and cryogenic safety reasons, the cryostat control PLC system will be designed as a closed PLC based control system. Hence commands will only be accepted from a human machine interface located next to the cryostat itself. All cryostat parameters and according sensor readings will be published via OpcUA, allowing for full remote cryostat monitoring. In contrast, the instrument control PLC system will interact with the higher level software using the advantages of the industrial OpcUA communication standard and will therefore allow for remote control. Further configuration and commissioning of those mechanisms is made conveniently accessible via this approach. All this is based on ESO’s concept for Line replaceable Units (LRU), which utilizes Beckhoff PLC units to ensure maintainability, availability.

Proceedings Article | 11 July 2018 Paper

Paper

USM Test Cryostat for the MICADO project: first steps in stabilizing and testing the cryostat

A. Monna, F. Lang-Bardl, F. Grupp, R. Bender, M. Haeuser, H. J. Hess, U. Hopp, H. Kravcar, J. Richter, J. Schlichter, H. Gebler

Proceedings Volume 10702, 1070295 (2018) https://doi.org/10.1117/12.2312492

KEYWORDS: Cryogenics, Optical testing

Read Abstract +

Proceedings Article | 11 July 2018 Paper

Paper

The MICADO Main Selection Mechanism (MSM): an operational mode selector for the MICADO instrument

F. Lang-Bardl, A. Monna, F. Grupp, R. Bender, M. Haeuser, H.-J. Hess, U. Hopp, H. Kravcar, J. Richter, J. Schlichter

Proceedings Volume 10702, 107028Y (2018) https://doi.org/10.1117/12.2311959

KEYWORDS: Interfaces, Cryogenics, Switches, Optical components, Imaging systems, Thermal modeling, Actuators, Spectroscopy, Mirrors, Image resolution

Read Abstract +

MICADO, the Multi AO Imaging Camera for Deep Observations, is one of the first light instruments for the ELT, currently under construction by the European Southern Observatory (ESO) on Cerro Armazones in Chile. It is built by a huge consortium with partners from the Netherlands, Austria, France, Italy, Finland and Germany under the lead of the Max-Planck-Institute for extraterrestrial Physics in Garching. The instrument will operate in the NIR wavelength range, thus is developed as a cryogenic instrument to work under vacuum conditions. It can be used as an imaging camera in a high and low resolution mode, a spectrometer and also as a coronagraph. For calibration purposes a so called ”pupil imager” mode will also be implemented. To switch between the operational modes MICADO will use the MSM to insert different optical modules to the fixed components of the High Resolution Imager (HRI) inside the cryostat. All moving parts have to operate under vacuum and at cryogenic temperatures. The MSM consists of a rotating platform, where the optical modules are mounted on. To lower the friction inside the mechanism we decided to use several small bearings to support the platform instead of a central big one. The small bearings are placed in a way, that the movement of the platform is limited to a rotation. Some of the bearings will be preloaded by springs to take also CTE differences or temperature gradients during the cool down and warm up phases into account. The mechanism will be driven by a cryogenic Phytron stepper motor with an integrated planetary gear box. Switches will be used to limit the rotation of the platform to the necessary range. Because of the challenging requirements on repositioning of the optical modules inside the science beam, we will use an indent mechanism. We are still investigating if the indent mechanism has to be actively driven or can be implemented as a passive version. The necessary optics to switch between the operational modes are designed as individual pre-aligned modules, each with a defined mechanical and thermal interface to the rotating platform. The Low Resolution Imager (LRI) consists of two flat mirrors, blocking some of the fixed components of the HRI. The spectrometer will use two reflective gratings, one acting as the main and one as a cross disperser. The cross disperser separates the overlaying orders on the focal plane array. The pupil viewer consists like the LRI module of two flat mirrors and an additional lens imaging the pupil to the focal plane. In this paper we will present the current mechanical design and first results of the structural and thermal FEM analyses we performed. We will also highlight first ideas on integration and alignment. A second paper (A. Monna et al., same proceedings) concentrates on the cryogenic setups we perform inside a cryostat to proof proper functionality of the chosen components and designs.

Proceedings Article | 9 August 2016 Open Access

Open Access

Paper

MICADO: first light imager for the E-ELT

R. Davies, J. Schubert, M. Hartl, J. Alves, Y. Clénet, F. Lang-Bardl, H. Nicklas, J.-U. Pott, R. Ragazzoni, E. Tolstoy, T. Agocs, H. Anwand-Heerwart, S. Barboza, P. Baudoz, R. Bender, P. Bizenberger, A. Boccaletti, W. Boland, P. Bonifacio, F. Briegel, T. Buey, F. Chapron, M. Cohen, O. Czoske, S. Dreizler, R. Falomo, P. Feautrier, N. Förster Schreiber, E. Gendron, R. Genzel, M. Glück, D. Gratadour, R. Greimel, F. Grupp, M. Häuser, M. Haug, J. Hennawi, H. J. Hess, V. Hörmann, R. Hofferbert, U. Hopp, Z. Hubert, D. Ives, W. Kausch, F. Kerber, H. Kravcar, K. Kuijken, M. Leitzinger, K. Leschinski, D. Massari, S. Mei, F. Merlin, L. Mohr, A. Monna, F. Müller, R. Navarro, M. Plattner, N. Przybilla, R. Ramlau, S. Ramsay, T. Ratzka, P. Rhode, J. Richter, H.-W. Rix, G. Rodeghiero, R.-R. Rohloff, G. Rousset, R. Ruddenklau, V. Schaffenroth, J. Schlichter, A. Sevin, R. Stuik, E. Sturm, J. Thomas, N. Tromp, M. Turatto, G. Verdoes-Kleijn, F. Vidal, R. Wagner, M. Wegner, W. Zeilinger, B. Ziegler, G. Zins

Proceedings Volume 9908, 99081Z (2016) https://doi.org/10.1117/12.2233047

KEYWORDS: Adaptive optics, Cameras, Adaptive optics, Cameras, Stars, Mirrors, Galactic astronomy, Imaging spectroscopy, Interfaces, Spectroscopy, Zoom lenses, Sensors

Read Abstract +

Proceedings Article | 27 July 2016 Paper

Paper

Upgrade of the HET segment control system, utilizing state-of-the-art, decentralized and embedded system controllers

Marco Häuser, Josef Richter, Herman Kriel, Amanda Turbyfill, Brent Buetow, Michael Ward

Proceedings Volume 9906, 990602 (2016) https://doi.org/10.1117/12.2232410

KEYWORDS: Control systems, Mirrors, Motion controllers, Telescopes, Observatories, Sensors, Actuators, Power supplies, Diagnostics

Read Abstract +

Together with the ongoing major instrument upgrade of the Hobby-Eberly Telescope (HET) we present the planned upgrade of the HET Segment Control System (SCS) to SCS2. Because HET's primary mirror is segmented into 91 individual 1-meter hexagonal mirrors, the SCS is essential to maintain the mirror alignment throughout an entire night of observations. SCS2 will complete tip, tilt and piston corrections of each mirror segment at a significantly higher rate than the original SCS. The new motion control hardware will further increase the system's reliability. The initial optical measurements of this array are performed by the Mirror Alignment Recovery System (MARS) and the HET Extra Focal Instrument (HEFI). Once the segments are optically aligned, the inductive edge sensors give sub-micron precise feedback of each segment's positions relative to its adjacent segments. These sensors are part of the Segment Alignment Maintenance System (SAMS) and are responsible for providing information about positional changes due to external influences, such as steep temperature changes and mechanical stress, and for making compensatory calculations while tracking the telescope on sky. SCS2 will use the optical alignment systems and SAMS inputs to command corrections of every segment in a closed loop. The correction period will be roughly 30 seconds, mostly due to the measurement and averaging process of the SAMS algorithm. The segment actuators will be controlled by the custom developed HET Segment MOtion COntroller (SMOCO). It is a direct descendant of University Observatory Munich's embedded, CAN-based system and instrument control tool-kit. To preserve the existing HET hardware layout, each SMOCO will control two adjacent mirror segments. Unlike the original SCS motor controllers, SMOCO is able to drive all six axes of its two segments at the same time. SCS2 will continue to allow for sub-arcsecond precision in tip and tilt as well as sub-micro meter precision in piston. These estimations are based on the current performance of the segment support mechanics. SMOCO's smart motion control allows for on-the-y correction of the move targets. Since SMOCO uses state-of-the-art motion control electronics and embedded decentralized controllers, we expect reduction in thermal emission as well as less maintenance time.

Proceedings Article | 24 July 2014 Paper

Paper

Presenting a high accuracy Theta-Phi-style fiber-positioner prototype with a 15-mm pitch

Marco Haeuser, Florian Lang-Bardl, Josef Richter, Hans-Joachim Hess, Adrian Degwert, Adolf Karasz, Ralf Kosyra, Ulrich Hopp, Ralf Bender

Proceedings Volume 9147, 91476V (2014) https://doi.org/10.1117/12.2056300

KEYWORDS: Electromagnetic coupling, Electronics, Prototyping, Control systems, Metrology, Calibration, Motion controllers, Electroluminescent displays, Observatories, Microcontrollers

Read Abstract +

Proceedings Article | 8 July 2014 Open Access

Open Access

Paper

Performance of the K-band multi-object spectrograph (KMOS) on the ESO VLT

Ray Sharples, Ralf Bender, Alex Agudo Berbel, Richard Bennett, Naidu Bezawada, Roberto Castillo, Michele Cirasuolo, Paul Clark, George Davidson, Richard Davies, Roger Davies, Marc Dubbeldam, Alasdair Fairley, Gert Finger, Natascha Schreiber, Reinhard Genzel, Reinhold Haefner, Achim Hess, Ives Jung, Ian Lewis, David Montgomery, John Murray, Bernard Muschielok, Jeff Pirard, Suzanne Ramsay, Philip Rees, Josef Richter, David Robertson, Ian Robson, Stephen Rolt, Roberto Saglia, Ivo Saviane, Joerg Schlichter, Linda Schmidtobreik, Alex Segovia, Alain Smette, Matthias Tecza, Stephen Todd, Michael Wegner, Erich Wiezorrek

Proceedings Volume 9147, 91470W (2014) https://doi.org/10.1117/12.2055496

KEYWORDS: Sensors, Spectrographs, Astronomical imaging, Telescopes, Calibration, Stars, Electronics, K band, Infrared radiation, Cryogenics

Read Abstract +

Proceedings Article | 24 September 2012 Open Access

Open Access

Paper

Status of the KMOS multi-object near-infrared integral field spectrograph

Ray Sharples, Ralf Bender, Alex Agudo Berbel, Richard Bennett, Naidu Bezawada, Michele Cirasuolo, Paul Clark, George Davidson, Richard Davies, Roger Davies, Marc Dubbeldam, Alasdair Fairley, Gert Finger, Reinhard Genzel, Reinhold Haefner, Achim Hess, Ian Lewis, David Montgomery, John Murray, Bernard Muschielok, Natascha Förster-Schreiber, Jeff Pirard, Suzanne Ramsay, Phil Rees, Josef Richter, David Robertson, Ian Robson, Stephen Rolt, Roberto Saglia, Jörg Schlichter, Mathias Tecza, Stephen Todd, Michael Wegner, Erich Wiezorrek

Proceedings Volume 8446, 84460K (2012) https://doi.org/10.1117/12.926021

KEYWORDS: Spectrographs, Sensors, Mirrors, Calibration, Spectral resolution, Image quality, Astronomical imaging, Electronics, Off axis mirrors, Lamps

Read Abstract +

Proceedings Article | 24 September 2012 Paper

Paper

A fibre positioner solution for the 4MOST instrument

Florian Lang-Bardl, Ralf Bender, Frank Grupp, Marco Häuser, Hans-Joachim Hess, Veronika Junk, Ralf Kosyra, Bernard Muschielok, Josef Richter, Jörg Schlichter, Christoph Schwab

Proceedings Volume 8446, 844661 (2012) https://doi.org/10.1117/12.925969

KEYWORDS: Staring arrays, Telescopes, Electronics, Spectrographs, Control systems, Mirrors, Microcontrollers, Metrology, Astronomical imaging, Optical instrument design

Read Abstract +

Proceedings Article | 15 July 2010 Paper

Paper

Implementation of the control electronics for KMOS instrument

Hans-Joachim Hess, Ivica Ilijevski, Helmut Kravcar, Josef Richter, Josef Rühfel, Christoph Schwab

Proceedings Volume 7735, 77352Q (2010) https://doi.org/10.1117/12.857988

KEYWORDS: Control systems, Electronics, Switches, Sensors, Calibration, Power supplies, Control systems design, Cryogenics, Local area networks, Optical filters

Read Abstract +

Proceedings Article | 15 July 2010 Open Access

Open Access

Paper

Recent progress on the KMOS multi-object integral-field spectrograph for ESO VLT

Ray Sharples, Ralf Bender, Alex Agudo Berbel, Richard Bennett, Naidu Bezawada, Nicolas Bouché, David Bramall, Mark Casali, Michele Cirasuolo, Paul Clark, Mark Cliffe, Richard Davies, Roger Davies, Niv Drory, Marc Dubbeldam, Alasdair Fairley, Gert Finger, Reinhard Genzel, Reinhold Haefner, Achim Hess, Paul Jeffers, Ian Lewis, David Montgomery, John Murray, Bernard Muschielok, Natascha Förster Schreiber, Jean Pirard, Suzie Ramsay-Howat, Philip Rees, Josef Richter, David Robertson, Ian Robson, Stephen Rolt, Roberto Saglia, Joerg Schlichter, Mathias Tecza, Stephen Todd, Michael Wegner, Erich Wiezorrek

Proceedings Volume 7735, 773515 (2010) https://doi.org/10.1117/12.856125

KEYWORDS: Spectrographs, Sensors, Astronomical imaging, Spectroscopy, Mirrors, Electronics, Off axis mirrors, Manufacturing, Infrared spectroscopy, Observatories

Read Abstract +

Proceedings Article | 28 June 2006 Open Access

Open Access

Paper

Design of the KMOS multi-object integral-field spectrograph

Ray Sharples, Ralf Bender, Richard Bennett, Keith Burch, Paul Carter, Mark Casali, Paul Clark, Robert Content, Richard Davies, Roger Davies, Marc Dubbeldam, Gert Finger, Reinhard Genzel, Reinhold Haefner, Achim Hess, Markus Kissler-Patig, Ken Laidlaw, Matt Lehnert, Ian Lewis, Alan Moorwood, Bernard Muschielok, Natascha Förster-Schreiber, Jeff Pirard, Suzanne Ramsay Howat, Phil Rees, Josef Richter, David Robertson, Ian Robson, Roberto Saglia, Matthias Tecza, Naranjan Thatte, Stephen Todd, Michael Wegner

Proceedings Volume 6269, 62691C (2006) https://doi.org/10.1117/12.669781

KEYWORDS: Spectrographs, Mirrors, Astronomical imaging, Spectroscopy, Galactic astronomy, Calibration, Sensors, Astronomy, Infrared spectroscopy, Prototyping

Read Abstract +

Proceedings Article | 29 September 2004 Paper

Paper

A cryogenic steering mirror for source selection in multi-integral-field spectrographs

Reiner Hofmann, Josef Richter, Daigo Tomono, Harald Weisz

Proceedings Volume 5495, (2004) https://doi.org/10.1117/12.551177

KEYWORDS: Mirrors, Telescopes, Spectrographs, Cryogenics, Mirror mounts, Lenses, Collimators, Space telescopes, Actuators, Relays

Read Abstract +

Showing 5 of 15 publications

SIGN IN TO:

View contact details

UPDATE YOUR PROFILE

Is this your profile? Update it now.

Sign into your SPIE.org account

Don’t have a profile and want one?

Create an account on SPIE.org

Advertisement

Advertisement