Dr. Johannes Sahlmann Profile

Dr. Johannes Sahlmann

Scientist at RHEA Group for the European Space Agency

SPIE Involvement:

Author

Publications (22)

Proceedings Article | 26 August 2022 Presentation + Paper

Presentation + Paper

A thesis to probe unique exoplanet regimes with micro-arcsecond astrometry and precision closure phases at CHARA and VLTI

Tyler Gardner, John Monnier, Francis Fekel, Jean-Baptiste Le Bouquin, Adam Scovera, Gail Schaefer, Stefan Kraus, Fred Adams, Narsireddy Anugu, Hayley Beltz, Jean-Philippe Berger, Theo ten Brummelaar, Claire Davies, Jacob Ennis, Douglas Gies, Keith J. C. Johnson, Pierre Kervella, Kaitlin Kratter, Aaron Labdon, Cyprien Lanthermann, Isaac Malsky, Emily Rauscher, Johannes Sahlmann, Benjamin Setterholm

Proceedings Volume 12183, 121830Z (2022) https://doi.org/10.1117/12.2630035

KEYWORDS: Planets, Stars, Calibration, Exoplanets, Data modeling, Interferometry, Binary data

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Proceedings Article | 29 July 2016 Paper

Paper

Enabling science with Gaia observations of naked-eye stars

J. Sahlmann, J. Martín-Fleitas, A. Mora, A. Abreu, C. Crowley, E. Joliet

Proceedings Volume 9904, 99042E (2016) https://doi.org/10.1117/12.2231240

KEYWORDS: Stars, Spectroscopy, Charge-coupled devices, Data acquisition, Exoplanets, Space operations, Planets, Point spread functions, Data processing, Composites

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Proceedings Article | 2 August 2014 Paper

Paper

Gaia on-board metrology: basic angle and best focus

A. Mora, M. Biermann, A. G. Brown, D. Busonero, L. Carminati, J. Carrasco, F. Chassat, M. Erdmann, W. L. Gielesen, C. Jordi, D. Katz, R. Kohley, L. Lindegren, W. Loeffler, O. Marchal, P. Panuzzo, G. Seabroke, J. Sahlmann, E. Serpell, I. Serraller, F. van Leeuwen, W. van Reeven, T. van den Dool, L. L. Vosteen

Proceedings Volume 9143, 91430X (2014) https://doi.org/10.1117/12.2054602

KEYWORDS: Telescopes, Space telescopes, Image quality, Wavefront sensors, Stars, Mirrors, Metrology, Charge-coupled devices, Atrial fibrillation, Electrons

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Proceedings Article | 2 August 2014 Paper

Paper

Enabling Gaia observations of naked-eye stars

J. Martín-Fleitas, J. Sahlmann, A. Mora, R. Kohley, B. Massart, J. L'Hermitte, M. Le Roy, P. Paulet

Proceedings Volume 9143, 91430Y (2014) https://doi.org/10.1117/12.2056325

KEYWORDS: Stars, Charge-coupled devices, Point spread functions, Staring arrays, Space telescopes, Atrial fibrillation, Detection and tracking algorithms, Telescopes, Space operations, Photometry

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Proceedings Article | 24 July 2014 Paper

Paper

Improving the astrometric performance of VLTI-PRIMA

J. Woillez, R. Abuter, L. Andolfato, J.-P. Berger, H. Bonnet, F. Delplancke, F. Derie, N. Di Lieto, S. Guniat, A. Mérand, T. Phan Duc, C. Schmid, N. Schuhler, T. Henning, R. Launhardt, F. Pepe, Didier Queloz, A. Quirrenbach, S. Reffert, J. Sahlmann, D. Segransan

Proceedings Volume 9146, 91461H (2014) https://doi.org/10.1117/12.2054723

KEYWORDS: Metrology, Space telescopes, Telescopes, Stars, Sensors, Mirrors, Polarization, Retroreflectors, Signal to noise ratio, Exoplanets

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Proceedings Article | 26 September 2013 Paper

Paper

Astrometric detection of exoplanets from the ground

J. Sahlmann, P. Lazorenko, A. Mérand, Didier Queloz, D. Ségransan, J. Woillez

Proceedings Volume 8864, 88641B (2013) https://doi.org/10.1117/12.2023929

KEYWORDS: Planets, Stars, Exoplanets, Telescopes, Interferometers, Space telescopes, Cameras, Exoplanetary science, Atmospheric optics, Motion measurement

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Proceedings Article | 12 September 2012 Paper

Paper

Status of PRIMA for the VLTI: heading to astrometry

C. Schmid, R. Abuter, A. Merand, J. Sahlmann, J. Alonso, L. Andolfato, G. van Belle, F. Delplancke, F. Dérie, N. Di Lieto, R. Frahm, Ph. Gitton, N. Gomes, P. Haguenauer, B. Justen, S. Lévêque, S. Ménardi, S. Morel, A. Müller, T. Phan Duc, Eszter Pozna, A. Ramirez, N. Schuhler, D. Ségransan

Proceedings Volume 8445, 84450F (2012) https://doi.org/10.1117/12.926426

KEYWORDS: Stars, Signal to noise ratio, Telescopes, Wavelet transforms, Sensors, IRIS Consortium, Mirrors, Observatories, Interferometry, Interferometers

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Proceedings Article | 12 September 2012 Paper

Paper

Narrow-angle astrometry with PRIMA

J. Sahlmann, D. Ségransan, A. Mérand, N. Zimmerman, R. Abuter, B. Chazelas, F. Delplancke, T. Henning, A. Kaminski, R. Köhler, R. Launhardt, M. Mohler, F. Pepe, Didier Queloz, A. Quirrenbach, S. Reffert, C. Schmid, N. Schuhler, T. Schulze-Hartung

Proceedings Volume 8445, 84450S (2012) https://doi.org/10.1117/12.926214

KEYWORDS: Stars, Metrology, Planets, Telescopes, Exoplanets, Sensors, Electroluminescent displays, Interferometers, Calibration, Mirrors

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Proceedings Article | 12 September 2012 Paper

Paper

Estimating visibility amplitudes with the PRIMA fringe trackers

Nuno Gomes, Christian Schmid, Johannes Sahlmann, Sérge Ménardi, Roberto Abuter, Antoine Mérand, Françoise Delplancke

Proceedings Volume 8445, 844522 (2012) https://doi.org/10.1117/12.925445

KEYWORDS: Visibility, Sensors, Error analysis, Detection and tracking algorithms, Phase shifts, Algorithm development, Calibration, Statistical analysis, Stars, Atmospheric modeling

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Proceedings Article | 22 July 2010 Paper

Paper

Status of PRIMA for the VLTI or the quest for user-friendly fringe tracking

C. Schmid, R. Abuter, S. Ménardi, L. Andolfato, F. Delplancke, F. Derie, N. Di Lieto, R. Frahm, Ph. Gitton, N. Gomes, P. Haguenauer, S. Lévêque, S. Morel, A. Müller, T. Phan Duc, Eszter Pozna, J. Sahlmann, N. Schuhler, G. van Belle

Proceedings Volume 7734, 77340F (2010) https://doi.org/10.1117/12.857419

KEYWORDS: Signal to noise ratio, Stars, Calibration, Sensors, Telescopes, Interferometry, Phase measurement, Signal detection, Mirrors, Observatories

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Proceedings Article | 22 July 2010 Paper

Paper

PACMAN: PRIMA astrometric instrument software

Roberto Abuter, Johannes Sahlmann, Eszter Pozna

Proceedings Volume 7734, 77340W (2010) https://doi.org/10.1117/12.857388

KEYWORDS: Sensors, Calibration, Metrology, Fourier transforms, Phase shifts, Modulation, Signal to noise ratio, Large telescopes, Time metrology, Computer architecture

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Proceedings Article | 22 July 2010 Paper

Paper

Status of the VLTI-UT performances wrt vibrations

Sebastien Poupar, Pierre Haguenauer, Antoine Merand, Jaime Alonso, Pierre Bourget, Stephane Brillant, Roberto Castillo, Nicola Di Lieto, Jean-Louis Lizon, Philippe Gitton, Johannes Sahlmann, Nicolas Schuhler

Proceedings Volume 7734, 773437 (2010) https://doi.org/10.1117/12.856757

KEYWORDS: Telescopes, Mirrors, Interferometry, Control systems, Space telescopes, Visibility, Large telescopes, Interferometers, Electronics, Observatories

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Proceedings Article | 22 July 2010 Paper

Paper

The very large telescope Interferometer: 2010 edition

Pierre Haguenauer, Jaime Alonso, Pierre Bourget, Stephane Brillant, Philippe Gitton, Stephane Guisard, Sébastien Poupar, Nicolas Schuhler, Roberto Abuter, Luigi Andolfato, Guillaume Blanchard, Jean-Philippe Berger, Angela Cortes, Frédéric Dérie, Françoise Delplancke, Nicola Di Lieto, Christophe Dupuy, Bruno Gilli, Andreas Glindemann, Serge Guniat, Gerhard Huedepohl, Andreas Kaufer, Jean-Baptiste Le Bouquin, Samuel Lévêque, Serge Ménardi, Antoine Mérand, Sebastien Morel, Isabelle Percheron, Than Phan Duc, Andres Pino, Andres Ramirez, Sridharan Rengaswamy, Andrea Richichi, Thomas Rivinius, Johannes Sahlmann, Markus Schoeller, Christian Schmid, Stan Stefl, Guillermo Valdes, Gerard van Belle, Stefan Wehner, Markus Wittkowski

Proceedings Volume 7734, 773404 (2010) https://doi.org/10.1117/12.857070

KEYWORDS: Telescopes, Astatine, Interferometers, Interferometry, Adaptive optics, Large telescopes, Mirrors, Observatories, Statistical analysis, Image quality

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Proceedings Article | 22 July 2010 Paper

Paper

First results from fringe tracking with the PRIMA fringe sensor unit

J. Sahlmann, R. Abuter, S. Ménardi, C. Schmid, N. Di Lieto, F. Delplancke, R. Frahm, N. Gomes, P. Haguenauer, S. Lévêque, S. Morel, A. Mueller, T. Phan Duc, N. Schuhler, G. van Belle

Proceedings Volume 7734, 773422 (2010) https://doi.org/10.1117/12.856896

KEYWORDS: Calibration, Phase shifts, Sensors, Phase measurement, Control systems, Observatories, Polarization, Telescopes, Interferometers, Chemical elements

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Proceedings Article | 28 July 2008 Paper

Paper

The VLTI real-time reflective memory data streaming and recording system

Roberto Abuter, Dan Popovic, Eszter Pozna, Johannes Sahlmann, Frank Eisenhauer

Proceedings Volume 7013, 70134A (2008) https://doi.org/10.1117/12.787882

KEYWORDS: Reflectivity, Computing systems, Computer architecture, Control systems, Astronomy, Binary data, Data processing, Network architectures, Distributed computing, Sensors

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Proceedings Article | 28 July 2008 Paper

Paper

Extragalactic reference targets for PRIMA

Gerard van Belle, Roberto Abuter, Judith Ngoumou, Francoise Delplancke, Johannes Sahlmann

Proceedings Volume 7013, 70133W (2008) https://doi.org/10.1117/12.789257

KEYWORDS: Galactic astronomy, Stars, Interferometry, Motion measurement, Interferometers, K band, Imaging systems, Image quality, Observatories, Sensors

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Proceedings Article | 28 July 2008 Open Access

Open Access

Paper

Study of the science capabilities of PRIMA in the Galactic Center

H. Bartko, O. Pfuhl, F. Eisenhauer, R. Genzel, S. Gillessen, S. Rabien, R. Abuter, G. v. Belle, F. Delplancke, S. Menardi, J. Sahlmann

Proceedings Volume 7013, 70134K (2008) https://doi.org/10.1117/12.787319

KEYWORDS: Stars, Infrared imaging, Astatine, Galactic astronomy, Interferometers, General relativity, Near infrared, Interferometry, Distance measurement

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Proceedings Article | 28 July 2008 Paper

Paper

Adaptive vibration cancellation on large telescopes for stellar interferometry

Nicola Di Lieto, Pierre Haguenauer, Johannes Sahlmann, Gautam Vasisht

Proceedings Volume 7013, 70130H (2008) https://doi.org/10.1117/12.787195

KEYWORDS: Detection and tracking algorithms, Telescopes, Large telescopes, Interferometers, Stellar interferometry, Mirrors, Actuators, Sensors, Computer simulations, Observatories

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Proceedings Article | 28 July 2008 Paper

Paper

The Very Large Telescope Interferometer: an update

Pierre Haguenauer, Roberto Abuter, Jaime Alonso, Javier Argomedo, Bertrand Bauvir, Guillaume Blanchard, Henri Bonnet, Stéphane Brillant, Michael Cantzler, Frédéric Derie, Françoise Delplancke, Nicola Di Lieto, Christophe Dupuy, Yves Durand, Philippe Gitton, Bruno Gilli, Andreas Glindemann, Serge Guniat, Stéphane Guisard, Nicolas Haddad, Gerhard Hudepohl, Christian Hummel, Nathaniel Jesuran, Andreas Kaufer, Bertrand Koehler, Jean-Baptiste Le Bouquin, Samuel Lévêque, Christopher Lidman, Pedro Mardones, Serge Ménardi, Sébastien Morel, Isabelle Percheron, Monika Petr-Gotzens, Than Phan Duc, Florence Puech, Andres Ramirez, Fredrik Rantakyrö, Andrea Richichi, Thomas Rivinius, Johannes Sahlmann, Stefan Sandrock, Markus Schöller, Nicolas Schuhler, Fabio Somboli, Stanislav Stefl, Mario Tapia, Gerard Van Belle, Anders Wallander, Stefan Wehner, Markus Wittkowski

Proceedings Volume 7013, 70130C (2008) https://doi.org/10.1117/12.788209

KEYWORDS: Telescopes, Astatine, Adaptive optics, Mirrors, Interferometers, Large telescopes, Interferometry, IRIS Consortium, Sensors, Observatories

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Proceedings Article | 28 July 2008 Paper

Paper

Results from the VLTI-PRIMA fringe tracking testbed

Johannes Sahlmann, Roberto Abuter, Nicola Di Lieto, Serge Ménardi, Françoise Delplancke, Hendrik Bartko, Frank Eisenhauer, Samuel Lévêque, Oliver Pfuhl, Nicolas Schuhler, Gerard van Belle, Gautam Vasisht

Proceedings Volume 7013, 70131A (2008) https://doi.org/10.1117/12.786612

KEYWORDS: Sensors, Calibration, Metrology, Computing systems, Signal to noise ratio, Atmospheric modeling, Detection and tracking algorithms, Observatories, Cameras, Actuators

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Proceedings Article | 28 June 2006 Paper

Paper

VLTI-PRIMA fringe tracking testbed

Roberto Abuter, Sebastian Rabien, Frank Eisenhauer, Johannes Sahlmann, Nicola Di Lieto, Marcus Haug, Anders Wallander, Samuel Lévêque, Serge Ménardi, Françoise Delplancke, Nicolas Schuhler, Stefan Kellner, Robert Frahm

Proceedings Volume 6268, 62682Y (2006) https://doi.org/10.1117/12.671318

KEYWORDS: Mirrors, Sensors, Control systems, Relays, Observatories, Atmospheric optics, Laser metrology, Device simulation, Optical simulations, Optics manufacturing

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Proceedings Article | 27 June 2006 Paper

Paper

PRIMA for the VLTI: a status report

Francoise Delplancke, Frédéric Derie, Samuel Lévêque, Serge Ménardi, Roberto Abuter, Luigi Andolfato, Pascal Ballester, Jeroen de Jong, Nicola Di Lieto, Philippe Duhoux, Robert Frahm, Philippe Gitton, Andreas Glindemann, Ralf Palsa, Florence Puech, Johannes Sahlmann, Nicolas Schuhler, Thanh Phan Duc, Bruno Valat, Anders Wallander

Proceedings Volume 6268, 62680U (2006) https://doi.org/10.1117/12.660395

KEYWORDS: Stars, Telescopes, Metrology, Sensors, Mirrors, Actuators, Interferometers, Control systems, Beam splitters, Calibration

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Showing 5 of 22 publications

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