Dr. Reiner Volkmer Profile

Dr. Reiner Volkmer

at Leibniz-Institut für Sonnenphysik (KIS)

SPIE Involvement:

Author

Publications (24)

Proceedings Article | 29 August 2022 Poster + Paper

Poster + Paper

The on-ground data reduction and calibration pipeline for SO/PHI-HRT

J. Sinjan, D. Calchetti, J. Hirzberger, D. Orozco Suárez, K. Albert, N. Albelo Jorge, T. Appourchaux, A. Alvarez-Herrero, J. Blanco Rodríguez, A. Gandorfer, D. Germerott, L. Guerrero, P. Gutierrez Marquez, F. Kahil, M. Kolleck, S. K. Solanki, J. C. del Toro Iniesta, R. Volkmer, J. Woch, B. Fiethe, J. M. Gómez Cama, I. Pérez-Grande, E. Sanchis Kilders, M. Balaguer Jiménez, L. R. Bellot Rubio, M. Carmona, W. Deutsch, G. Fernandez-Rico, A. Fernández-Medina, P. García Parejo, J. L. Gasent Blesa, L. Gizon, B. Grauf, K. Heerlein, A. Korpi-Lagg, T. Lange, A. López Jiménez, T. Maue, R. Meller, H. Michalik, A. Moreno Vacas, R. Müller, E. Nakai, W. Schmidt, J. Schou, U. Schühle, J. Staub, H. Strecker, I. Torralbo, G. Valori

Proceedings Volume 12189, 121891J (2022) https://doi.org/10.1117/12.2629323

KEYWORDS: Space operations, Modulation, Polarimetry, Magnetism, Sun, Polarization, Demodulation, Calibration, Telescopes, Sensors, Data processing, Image processing

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Proceedings Article | 27 August 2022 Poster + Paper

Poster + Paper

Image quality of data products of the high resolution telescope of the polarimetric and helioseismic imager

F. Kahil, A. Gandorfer, J. Hirzberger, D. Orozco Suárez, K. Albert, N. Albelo Jorge, T. Appourchaux, A. Álvarez-Herrero, J. Blanco Rodríguez, D. Germerott, L. Guerrero, P. Gutierrez Marquez, J. Sinjan, D. Calchetti, M. Kolleck, S. Solanki, J. del Toro Iniesta, R. Volkmer, J. Woch, B. Fiethe, J. Gómez Cama, I. Pérez-Grande, E. Sanchis Kilders, M. Balaguer Jiménez, L. Bellot Rubio, M. Carmona, W. Deutsch, G. Fernandez-Rico, A. Fernández-Medina, P. García Parejo, J. Gasent Blesa, L. Gizon, B. Grauf, K. Heerlein, A. Korpi-Lagg, T. Lange, A. López Jiménez, T. Maue, R. Meller, H. Michalik, A. Moreno Vacas, R. Müller, E. Nakai, W. Schmidt, J. Schou, U. Schühle, J. Staub, H. Strecker, I. Torralbo, G. Valori

Proceedings Volume 12180, 121803F (2022) https://doi.org/10.1117/12.2628942

KEYWORDS: Wavefronts, Telescopes, Point spread functions, Image quality, Monochromatic aberrations, Image restoration, Calibration, Sun, Remote sensing, Reconstruction algorithms

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SPIE Journal Paper | 30 July 2019

Subpixel real-time jitter detection algorithm and implementation for polarimetric and helioseismic imager

David Roma, Manuel Carmona, José Bosch, Albert Casas, Atilà Herms, Manel López, Oscar Ruiz, Josep Sabater, Thomas Berkefeld, Thorsten Maue, Eiji Nakai, Wolfgang Schmidt, Dirk Soltau, Reiner Volkmer, José María Gómez

JATIS, Vol. 5, Issue 03, 039003, (July 2019) https://doi.org/10.1117/12.10.1117/1.JATIS.5.3.039003

KEYWORDS: Detection and tracking algorithms, Lithium, Motion estimation, Polarimetry, Cameras, Imaging systems, Field programmable gate arrays, Sun, Digital signal processing, Image resolution

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Proceedings Article | 6 July 2018 Paper

Paper

The High Resolution Telescope (HRT) of the Polarimetric and Helioseismic Imager (PHI) onboard Solar Orbiter

A. Gandorfer, B. Grauf, J. Staub, J. Bischoff, J. Woch, J. Hirzberger, S. Solanki, A. Álvarez-Herrero, P. García Parejo, W. Schmidt, R. Volkmer, T. Appourchaux, J. C. del Toro Iniesta

Proceedings Volume 10698, 106984N (2018) https://doi.org/10.1117/12.2311816

KEYWORDS: Mirrors, Telescopes, Space telescopes, Fabry–Perot interferometers, Optical filters, Polarimetry, Optical alignment, Imaging systems

Read Abstract +

Solar Orbiter is a joint mission of ESA and NASA scheduled for launch in 2020. Solar Orbiter is a complete and unique heliophysics mission, combining remote sensing and in-situ analysis; its special elliptical orbit allows viewing the Sun from a distance of only 0.28 AU, and - leaving the ecliptic plane - to observe the solar poles from a hitherto unexplored vantage point. One of the key instruments for Solar Orbiter’s science is the "Polarimetric and Helioseismic Imager" (PHI), which will provide maps of the solar surface magnetic fields and the gas flows on the visible solar surface. Two telescopes, a full disc imager, and a high resolution channel feed a common Fabry-Perot based tunable filter and thus allow sampling a single Fraunhofer line at 617.3 nm with high spectral resolution; a polarization modulation system makes the system sensitive to the full state of polarization. From the analysis of the Doppler shift and the magnetically induced Zeeman polarization in this line, the magnetic field and the line-of-sight gas motions can be detected for each point in the image. In this paper we describe the opto-mechanical system design of the high resolution telescope. It is based on a decentred Ritchey-Chrétien two-mirror telescope. The telescope includes a Barlow type magnifier lens group, which is used as in-orbit focus compensator, and a beam splitter, which sends a small fraction of the collected light onto a fast camera, which provides the error signals for the actively controlled secondary mirror compensating for spacecraft jitter and other disturbances. The elliptical orbit of the spacecraft poses high demands on the thermo-mechanical stability. The varying size of the solar disk image requires a special false-light suppression architecture, which is briefly described. In combination with a heat-rejecting entrance window, the optical energy impinging on the polarimetric and spectral analysis system is efficiently reduced. We show how the design can preserve the diffraction-limited imaging performance over the design temperature range of -20°C to +60°C. The decentred hyperbolical mirrors require special measures for the inter-alignment and their alignment with respect to the mechanical structure. A system of alignment flats and mechanical references is used for this purpose. We will describe the steps of the alignment procedure, and the dedicated optical ground support equipment, which are needed to reach the diffraction limited performance of the telescope. We will also report on the verification of the telescope performance, both - in ambient condition - and in vacuum at different temperatures.

Proceedings Article | 8 August 2016 Paper

Paper

Design and test of a tip-tilt driver for an image stabilization system

Albert Casas, José María Gómez, David Roma, Manuel Carmona, Manel López, José Bosch, Atilà Herms, Josep Sabater, Reiner Volkmer, Frank Heidecke, Thorsten Maue, Eiji Nakai, Jörg Baumgartner, Wolfgang Schmidt

Proceedings Volume 9911, 991123 (2016) https://doi.org/10.1117/12.2232469

KEYWORDS: Amplifiers, Mirrors, Transistors, Actuators, Capacitors, Polarimetry, Control systems, Sun, Imaging systems, Distortion

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Proceedings Article | 4 August 2014 Paper

Paper

System model of an image stabilization system

Manuel Carmona, José María Gómez, David Roma, Albert Casas, Manel López, José Bosch, Atilà Herms, Josep Sabater, Reiner Volkmer, Frank Heidecke, Thorsten Maue, Eiji Nakai, Wolfgang Schmidt

Proceedings Volume 9150, 91501U (2014) https://doi.org/10.1117/12.2054867

KEYWORDS: Cameras, Mirrors, Sensors, Control systems, Sun, Computed tomography, Systems modeling, Image sensors, Electronics, Polarimetry

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Proceedings Article | 23 July 2014 Paper

Paper

Electronics design for a high precision image stabilization system

A. Casas, D. Roma, M. Carmona, J. M. Gómez, J. Bosch, M. López, J. Sabater, A. Herms, T. Maue, E. Nakai, R. Volkmer, W. Schmidt

Proceedings Volume 9154, 91542J (2014) https://doi.org/10.1117/12.2054885

KEYWORDS: Amplifiers, Transistors, Cameras, Sensors, Electronics, Image processing, Field programmable gate arrays, Image sensors, Imaging systems, Control systems

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SPIE Journal Paper | 21 March 2013

GREGOR Fabry-Pérot interferometer and its companion the blue imaging solar spectrometer

Klaus Puschmann, Carsten Denker, Horst Balthasar, Rohan Louis, Emil Popow, Manfred Woche, Christian Beck, Thomas Seelemann, Reiner Volkmer

OE, Vol. 52, Issue 08, 081606, (March 2013) https://doi.org/10.1117/12.10.1117/1.OE.52.8.081606

KEYWORDS: Fabry–Perot interferometers, Cameras, Telescopes, Polarimetry, Interferometers, Point spread functions, Spectroscopy, Imaging systems, Solar telescopes, Sensors

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Proceedings Article | 24 September 2012 Paper

Paper

GREGOR Fabry-Pérot interferometer: status report and prospects

Klaus Puschmann, Horst Balthasar, Christian Beck, Rohan Louis, Emil Popow, Thomas Seelemann, Reiner Volkmer, Manfred Woche, Carsten Denker

Proceedings Volume 8446, 844679 (2012) https://doi.org/10.1117/12.924834

KEYWORDS: Telescopes, Cameras, Fabry–Perot interferometers, Iron, Point spread functions, Polarimetry, Imaging systems, Adaptive optics, Sensors, Optical filters

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Proceedings Article | 21 September 2012 Paper

Paper

Image stabilisation system of the photospheric and helioseismic imager

R. Volkmer, J. Bosch, B. Feger, J. M. Gomez, F. Heidecke, W. Schmidt, T. Scheiffelen, M. Sigwarth, D. Soltau

Proceedings Volume 8442, 84424P (2012) https://doi.org/10.1117/12.926018

KEYWORDS: Cameras, Mirrors, Sensors, Control systems, Imaging systems, Space operations, Field programmable gate arrays, Polarimetry, Optical filters, High speed cameras

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Proceedings Article | 5 August 2010 Paper

Paper

The heat stop for the 4-m European Solar Telescope EST

F. Berrilli, A. Egidi, D. Del Moro, F. Manni, M. Cocciolo, A. Scotto, R. Volkmer, F. C. Bettonvil, M. Collados Vera, L. Cavaller Marquez, J. Sanchez Capuchino

Proceedings Volume 7733, 77332Z (2010) https://doi.org/10.1117/12.856596

KEYWORDS: Cooling systems, Reflectivity, Sun, Telescopes, Solar telescopes, CFD analysis, Coronagraphy, Mirrors, Thermal analysis, Finite element methods

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Proceedings Article | 28 July 2010 Paper

Paper

GREGOR telescope: start of commissioning

R. Volkmer, O. von der Lühe, C. Denker, S. Solanki, H. Balthasar, T. Berkefeld, P. Caligari, M. Collados, C. Halbgewachs, F. Heidecke, A. Hofmann, M. Klvana, F. Kneer, A. Lagg, E. Popow, D. Schmidt, W. Schmidt, M. Sobotka, D. Soltau, K. Strassmeier

Proceedings Volume 7733, 77330K (2010) https://doi.org/10.1117/12.857079

KEYWORDS: Mirrors, Telescopes, Adaptive optics, Cooling systems, Zerodur, Sun, Polarimetry, Solar telescopes, Coating, Visible radiation

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Proceedings Article | 28 July 2010 Paper

Paper

European Solar Telescope: project status

M. Collados, F. Bettonvil, L. Cavaller, I. Ermolli, B. Gelly, C. Grivel-Gelly, A. Pérez, H. Socas-Navarro, D. Soltau, R. Volkmer

Proceedings Volume 7733, 77330H (2010) https://doi.org/10.1117/12.856994

KEYWORDS: Mirrors, Telescopes, Adaptive optics, Solar telescopes, Optical design, Polarization, Polarimetry, Space telescopes, Control systems, Solar processes

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Proceedings Article | 22 July 2010 Paper

Paper

EST Telescope: primary mirror, support, and cooling system

R. Volkmer, F. Manni, M. Giannuzzi, A. Scotto, L. Cavaller, T. Scheiffelen, F. Bettonvil, F. Berrilli

Proceedings Volume 7739, 77391O (2010) https://doi.org/10.1117/12.857238

KEYWORDS: Mirrors, Telescopes, Cooling systems, Actuators, Space telescopes, Solids, Solar telescopes, Adaptive optics, Active optics, Optical instrument design

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Proceedings Article | 22 July 2010 Paper

Paper

GREGOR M1 mirror and cell design: effects of different mirror substrates on the telescope design

M. Süß, R. Volkmer, P. Eisenträger

Proceedings Volume 7739, 77391I (2010) https://doi.org/10.1117/12.857041

KEYWORDS: Mirrors, Cooling systems, Telescopes, Space telescopes, Manufacturing, Optical instrument design, Zerodur, Optical design, Telescope design, Mirror pointing

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Proceedings Article | 21 July 2010 Paper

Paper

The GREGOR Fabry-Perot interferometer: a new instrument for high-resolution solar observations

Carsten Denker, Horst Balthasar, Axel Hofmann, Nazaret Bello González, Reiner Volkmer

Proceedings Volume 7735, 77356M (2010) https://doi.org/10.1117/12.856830

KEYWORDS: Polarimetry, Magnetism, Mirrors, Solar telescopes, Telescopes, Sun, Fabry–Perot interferometers, Adaptive optics, Solar processes, Sensors

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Proceedings Article | 22 July 2008 Paper

Paper

Thermal characteristics of the solar telescope GREGOR

R. Volkmer

Proceedings Volume 7012, 70120K (2008) https://doi.org/10.1117/12.790326

KEYWORDS: Telescopes, Mirrors, Cooling systems, Solar telescopes, Optical instrument design, Mirror structures, Sun, Temperature metrology, Silicon carbide, Image quality

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Proceedings Article | 6 July 2006 Paper

Paper

The Cesic ceramic optics of the GREGOR telescope

Matthias Krödel, Georg Luichtel, Reiner Volkmer

Proceedings Volume 6273, 62730Q (2006) https://doi.org/10.1117/12.671791

KEYWORDS: Mirrors, Telescopes, Polishing, Optics manufacturing, Manufacturing, Surface finishing, Ceramics, Silicon carbide, Coating, Observatories

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Proceedings Article | 23 June 2006 Paper

Paper

GREGOR AO as a tool for telescope commissioning

D. Soltau, Th. Berkefeld, R. Volkmer

Proceedings Volume 6267, 626711 (2006) https://doi.org/10.1117/12.672754

KEYWORDS: Telescopes, Mirrors, Adaptive optics, Actuators, Wavefronts, Wavefront sensors, Optical components, Deformable mirrors, Calibration, Monochromatic aberrations

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Proceedings Article | 23 June 2006 Paper

Paper

The new 1.5m solar telescope GREGOR: first light and start of commissioning

Reiner Volkmer, Oskar von der Lühe, Franz Kneer, Jürgen Staude, Thomas Berkefeld, Peter Caligari, Clemens Halbgewachs, Frank Heidecke, Wolfgang Schmidt, Dirk Soltau, Harald Nicklas, Axel Wittmann, Horst Balthasar, Axel Hofmann, Klaus Strassmeier, Michal Sobotka, Miroslav Klvana, Manuel Collados

Proceedings Volume 6267, 62670W (2006) https://doi.org/10.1117/12.671165

KEYWORDS: Mirrors, Telescopes, Adaptive optics, Solar telescopes, Control systems, Integrated optics, Polarimetry, Optical benches, Manufacturing, Silicon carbide

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Proceedings Article | 15 September 2005 Paper

Paper

The new 1.5 solar telescope GREGOR: progress report and results of performance tests

Reiner Volkmer, Oskar von der Lühe, Franz Kneer, Jürgen Staude, Thomas Berkefeld, Peter Caligari, Clemens Halbgewachs, Wolfgang Schmidt, Dirk Soltau, Harald Nicklas, Axel Wittmann, Horst Balthasar, Axel Hofmann, Klaus Strassmeier, Michal Sobotka, Miroslav Klvana, Manuel Collados

Proceedings Volume 5901, 590108 (2005) https://doi.org/10.1117/12.618247

KEYWORDS: Telescopes, Mirrors, Control systems, Space telescopes, Solar telescopes, Adaptive optics, Manufacturing, Optical alignment, Spectrographs, Deformable mirrors

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Proceedings Article | 28 September 2004 Paper

Paper

Progress report of the 1.5 m solar telescope GREGOR

Reiner Volkmer, Oskar von der Lühe, Franz Kneer, Jurgen Staude, Thomas Berkefeld, Peter Caligari, Wolfgang Schmidt, Dirk Soltau, Harald Nicklas, Eberhardt Wiehr, Axel Wittmann, Horst Balthasar, Axel Hofmann, Klaus Strassmeier, Michal Sobotka, Miroslav Klvana, Manuel Collados

Proceedings Volume 5489, (2004) https://doi.org/10.1117/12.551577

KEYWORDS: Telescopes, Mirrors, Control systems, Adaptive optics, Spectrographs, Space telescopes, Solar telescopes, Domes, Spectroscopy, Optics manufacturing

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Proceedings Article | 12 December 2003 Paper

Paper

Optical and thermal design of the main optic of the solar telescope GREGOR

Reiner Volkmer, Oskar von der Luhe, Dirk Soltau, Peter Emde, Matthias Krodel, Norbert Pailer, Eberhardt Wiehr

Proceedings Volume 5179, (2003) https://doi.org/10.1117/12.506710

KEYWORDS: Mirrors, Telescopes, Thermography, Solar telescopes, Thermal analysis, Zerodur, Optical instrument design, Optical design, Solar radiation, Radiation effects

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Proceedings Article | 11 February 2003 Paper

Paper

GREGOR: the new 1.5-m solar telescope on Tenerife

Reiner Volkmer, Oskar von der Luehe, Franz Kneer, Juergen Staude, Axel Hofmann, Wolfgang Schmidt, Michal Sobotka, Dirk Soltau, Eberhardt Wiehr, Axel Wittmann, Thomas Berkefeld

Proceedings Volume 4853, (2003) https://doi.org/10.1117/12.471367

KEYWORDS: Telescopes, Adaptive optics, Mirrors, Space telescopes, Solar telescopes, Spectrographs, Polarimetry, Magnetism, Sun, Observatories

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Showing 5 of 24 publications

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