Dr. Achim M. Gandorfer Profile

Dr. Achim M. Gandorfer

at Max-Planck-Institut für Sonnensystemforschung

SPIE Involvement:

Author

Publications (21)

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 | 18 December 2020 Open Access

Open Access

Autonomous on-board data processing and instrument calibration software for the Polarimetric and Helioseismic Imager on-board the Solar Orbiter mission

Kinga Albert, Johann Hirzberger, Martin Kolleck, Nestor Albelo Jorge, Dennis Busse, Julian Blanco Rodríguez, Juan Pedro Cobos Carrascosa, Björn Fiethe, Achim Gandorfer, Dietmar Germerott, Yejun Guan, Lucas Guerrero, Pablo Gutierrez-Marques, David Hernández Expósito, Tobias Lange, Harald Michalik, David Orozco Suárez, Jesper Schou, Sami Solanki, José Carlos del Toro Iniesta, Joachim Woch

JATIS, Vol. 6, Issue 04, 048004, (December 2020) https://doi.org/10.1117/12.10.1117/1.JATIS.6.4.048004

KEYWORDS: Data processing, Calibration, Image processing, Space operations, Polarimetry, Demodulation, Polarization, Sensors, Magnetism, Imaging systems

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Proceedings Article | 13 December 2020 Poster + Paper

Poster + Paper

Sunrise Chromospheric Infrared spectroPolarimeter (SCIP) for SUNRISE III: opto-mechanical analysis and design

Fumihiro Uraguchi, Toshihiro Tsuzuki, Yukio Katsukawa, Hirohisa Hara, Satoru Iwamura, Masahito Kubo, Yoshifumi Nodomi, Yoshinori Suematsu, Yusuke Kawabata, Toshifumi Shimizu, Achim Gandorfer, Jose Carlos del Toro Iniesta

Proceedings Volume 11447, 11447AB (2020) https://doi.org/10.1117/12.2561812

KEYWORDS: Infrared spectroscopy, Infrared radiation, Wavefronts, Optical components, Infrared telescopes, Error analysis, Optical instrument design, Observatories, Telescopes, Motion analysis

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Proceedings Article | 13 December 2020 Poster + Paper

Poster + Paper

The SUNRISE UV Spectropolarimeter and imager for SUNRISE III

Alex Feller, Achim Gandorfer, Francisco Iglesias, Andreas Lagg, Tino Riethmüller, Sami Solanki, Yukio Katsukawa, Masahito Kubo

Proceedings Volume 11447, 11447AK (2020) https://doi.org/10.1117/12.2562666

KEYWORDS: Ultraviolet radiation, Imaging systems, Observatories, Solar processes, Atmospheric plasma, Magnetism, Plasma, Stratosphere, Turbulence, Earth's atmosphere

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Proceedings Article | 13 December 2020 Poster + Paper

Poster + Paper

Sunrise Chromospheric Infrared spectroPolarimeter (SCIP) for SUNRISE III: optical design and performance

Toshihiro Tsuzuki, Yukio Katsukawa, Fumihiro Uraguchi, Hirohisa Hara, Masahito Kubo, Yoshifumi Nodomi, Yoshinori Suematsu, Yusuke Kawabata, Toshifumi Shimizu, Achim Gandorfer, Alex Feller, Bianca Grauf, Sami Solanki, Jose Carlos del Toro Iniesta

Proceedings Volume 11447, 11447AJ (2020) https://doi.org/10.1117/12.2562245

KEYWORDS: Infrared spectroscopy, Infrared radiation, Optical design, Diffraction gratings, Infrared telescopes, Spectral resolution, Diffraction, Wavefronts, Error analysis, Optical instrument design

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Proceedings Article | 13 December 2020 Presentation + Paper

Presentation + Paper

Sunrise Chromospheric Infrared SpectroPolarimeter (SCIP) for sunrise III: system design and capability

Y. Katsukawa, J. C. del Toro Iniesta, S. Solanki, M. Kubo, H. Hara, T. Shimizu, T. Oba, Y. Kawabata, T. Tsuzuki, F. Uraguchi, Y. Nodomi, K. Shinoda, T. Tamura, Y. Suematsu, R. Ishikawa, R. Kano, T. Matsumoto, K. Ichimoto, S. Nagata, C. Quintero Noda, T. Anan, D. Orozco Suárez, M. Balaguer Jiménez, A. López Jiménez, J. P. Cobos Carrascosa, A. Feller, T. Riethmueller, A. Gandorfer, A. Lagg

Proceedings Volume 11447, 114470Y (2020) https://doi.org/10.1117/12.2561223

KEYWORDS: Infrared spectroscopy, Infrared radiation, Signal detection, Observatories, Solar processes, Spectral resolution, Polarimetry, Polarization, Optical telescopes, Near ultraviolet

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Proceedings Article | 13 December 2020 Poster + Paper

Poster + Paper

SUNRISE Chromospheric Infrared spectroPolarimeter (SCIP) for SUNRISE III: Scan mirror mechanism

Takayoshi Oba, Toshifumi Shimizu, Yukio Katsukawa, Masahito Kubo, Fumihiro Uraguchi, Toshihiro Tsuzuki, Tomonori Tamura, Kazuya Shinoda, Kazuhide Kodeki, Kazuhiko Fukushima, Achim Gandorfer, Jose Carlos del Toro Iniesta

Proceedings Volume 11445, 114454F (2020) https://doi.org/10.1117/12.2562075

KEYWORDS: Mirrors, Infrared spectroscopy, Infrared radiation, Infrared imaging, Magnetism, Solar processes, Spatial resolution, Electromagnetism, Actuators, Capacitance

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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 | 6 July 2018 Presentation + Paper

Presentation + Paper

Autonomous on-board data processing and instrument calibration software for the SO/PHI

K. Albert, J. Hirzberger, D. Busse, T. Lange, M. Kolleck, B. Fiethe, D. Orozco Suárez, J. Woch, J. Schou, J. Blanco Rodriguez, A. Gandorfer, Y. Guan, J. P. Cobos Carrascosa, D. Hernández Expósito, J. C. del Toro Iniesta, S. K. Solanki, H. Michalik

Proceedings Volume 10707, 107070O (2018) https://doi.org/10.1117/12.2311718

KEYWORDS: Data processing, Image processing, Calibration, Image sensors, Digital imaging, Space operations, Field programmable gate arrays, Polarimetry, Sensors

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Proceedings Article | 18 July 2016 Paper

Paper

The Solar Ultraviolet Imaging Telescope onboard Aditya-L1

Avyarthana Ghosh, Subhamoy Chatterjee, Aafaque Khan, Durgesh Tripathi, A. Ramaprakash, Dipankar Banerjee, Pravin Chordia, Achim Gandorfer, Natalie Krivova, Dibyendu Nandy, Chaitanya Rajarshi, Sami Solanki, S. Sriram

Proceedings Volume 9905, 990503 (2016) https://doi.org/10.1117/12.2232266

KEYWORDS: Space operations, Ultraviolet radiation, Space telescopes, Telescopes, Space telescopes, Solar processes, Sensors, X-ray imaging, Plasma, Ions, Magnetosphere

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Proceedings Article | 19 July 2010 Paper

Paper

Flight control software for the wave-front sensor of SUNRISE 1m balloon telescope

Alexander Bell, Peter Barthol, Thomas Berkefeld, Bernhard Feger, Achim Gandorfer, Frank Heidecke, Michael Knoelker, Valentin Pillet, Wolfgang Schmidt, Michael Sigwarth, Sami Solanki, Dirk Soltau, Alan Title

Proceedings Volume 7740, 774003 (2010) https://doi.org/10.1117/12.857003

KEYWORDS: Telescopes, Sensors, Picosecond phenomena, Space telescopes, Mirrors, Control systems, Telecommunications, Computing systems, Cameras

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Proceedings Article | 27 June 2006 Paper

Paper

The EPICS project for the European Extremely Large Telescope: outcome of the Planet Finder concept study for OWL

C. Vérinaud, N. Hubin, M. Kasper, J. Antichi, P. Baudoz, J.-L. Beuzit, A. Boccaletti, A. Chalabaev, K. Dohlen, E. Fedrigo, C. Correia Da Silva, M. Feldt, T. Fusco, A. Gandorfer, R. Gratton, H. Kuntschner, F. Kerber, R. Lenzen, P. Martinez, E. Le Coarer, A. Longmore, D. Mouillet, R. Navarro, J. Paillet, P. Rabou, F. Rahoui, F. Selsis, H. Schmid, R. Soummer, D. Stam, C. Thalmann, J. Tinbergen, M. Turatto, N. Yaitskova

Proceedings Volume 6272, 62720M (2006) https://doi.org/10.1117/12.671641

KEYWORDS: Planets, Coronagraphy, Telescopes, Stars, Sensors, Adaptive optics, Large telescopes, Mirrors, Imaging systems, Exoplanets

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Proceedings Article | 23 June 2006 Paper

Paper

SUNRISE: high-resolution UV/VIS observations of the Sun from the stratosphere

A. Gandorfer, S. Solanki, P. Barthol, B. Lites, V. Martínez Pillet, W. Schmidt, D. Soltau, A. Title

Proceedings Volume 6267, 62670S (2006) https://doi.org/10.1117/12.672828

KEYWORDS: Telescopes, Magnetism, Image filtering, Mirrors, Optical filters, CCD cameras, Sun, Solar processes, Wavefront sensors, Polarization

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Proceedings Article | 28 September 2004 Paper

Paper

SUNRISE: high-resolution UV/VIS observations of the Sun from the stratosphere

Achim Gandorfer, Sami Solanki, Manfred Schussler, Werner Curdt, Bruce Lites, Valentin Martinez Pillet, Wolfgang Schmidt, Alan Title

Proceedings Volume 5489, (2004) https://doi.org/10.1117/12.549119

KEYWORDS: Magnetism, Telescopes, Mirrors, CCD cameras, Optical filters, Image filtering, Solar processes, Sun, Polarimetry, Imaging systems

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Proceedings Article | 14 February 2003 Paper

Paper

Characterization of polarizing beamsplitters by ray tracing

Thomas Bluemchen, Achim Gandorfer

Proceedings Volume 4843, (2003) https://doi.org/10.1117/12.458616

KEYWORDS: Beam splitters, Polarization, Prisms, Sensors, Spectrographs, Spectroscopy, Solar telescopes, Ray tracing, Polarimetry, Optical aberrations

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Proceedings Article | 14 February 2003 Paper

Paper

Imaging vector polarimetry at the 10^-5 level in the optical and near UV part of the solar spectrum

Achim Gandorfer

Proceedings Volume 4843, (2003) https://doi.org/10.1117/12.458612

KEYWORDS: Polarization, Polarimetry, Modulation, Charge-coupled devices, Modulators, Scattering, CCD image sensors, Near ultraviolet, Photons, Sensors

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Proceedings Article | 14 February 2003 Paper

Paper

Achromatic liquid crystal polarization modulator

Daniel Gisler, Alex Feller, Achim Gandorfer

Proceedings Volume 4843, (2003) https://doi.org/10.1117/12.458835

KEYWORDS: Modulators, Polarization, Wave plates, Modulation, Polarimetry, Switching, Liquid crystals, Solids, Birefringence, Ferroelectric LCDs

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Proceedings Article | 11 February 2003 Paper

Paper

SUNRISE: a balloon-borne telescope for high resolution solar observations in the visible and UV

Sami Solanki, Achim Gandorfer, Manfred Schuessler, W. Curdt, Bruce Lites, Valentin Martinez-Pillet, Wolfgang Schmidt, Alan Title

Proceedings Volume 4853, (2003) https://doi.org/10.1117/12.460283

KEYWORDS: Magnetism, Telescopes, Mirrors, Solar processes, Optical filters, CCD cameras, Ultraviolet radiation, Polarimetry, Sun, Polarization

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SPIE Journal Paper | 1 August 1999

Ferroelectric retarders as an alternative to piezoelastic modulators for use in solar Stokes vector polarimetry

Achim Gandorfer

OE, Vol. 38, Issue 08, (August 1999) https://doi.org/10.1117/12.10.1117/1.602183

KEYWORDS: Modulators, Polarization, Modulation, Wave plates, Polarimetry, CCD image sensors, Magnetism, Liquid crystals, Phase shift keying, Demodulation

SPIE Journal Paper | 1 May 1997

Active alignment of replicated microlens arrays on a charge-coupled device imager

Michael Gale, Joern Pedersen, Helmut Schuetz, Hans-Peter Povel, Achim Gandorfer, P. Steiner, Pietro Bernasconi

OE, Vol. 36, Issue 05, (May 1997) https://doi.org/10.1117/12.10.1117/1.601352

KEYWORDS: Charge-coupled devices, Microlens array, Imaging systems, Microlens, CCD image sensors, Polarimetry, Optical alignment, Modulation, Glasses, Stray light

Showing 5 of 21 publications

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