Dr. Jens T. Knudstrup Profile

Dr. Jens T. Knudstrup

at European Southern Observatory

SPIE Involvement:

Author

Publications (14)

Proceedings Article | 13 December 2020 Poster + Paper

Moving to the open source open62541 library for PLC communication at the European Southern Observatory's Very Large Telescope

Thomas Ives, Jens Knudstrup, Federico Pellegrin

Proceedings Volume 11452, 114521P (2020) https://doi.org/10.1117/12.2561532

KEYWORDS: Photonic integrated circuits, Large telescopes, Control systems, Commercial off the shelf technology, Standards development, Telecommunications, Optical proximity correction, Licensing

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Proceedings Article | 6 July 2018 Presentation + Paper

Design of the ERIS instrument control software

Andrea Baruffolo, Bernardo Salasnich, Alfio Puglisi, Paolo Grani, Xiaofeng Gao, Erich Wiezorrek, Daniela Fantinel, Gianluca Di Rico, Jens Knudstrup, Christophe Moins, Olivier Absil, David Barr, Alexander Buron, Elsa Huby, Matthew Kenworthy, Mario Kiekebusch, Dan Popovic, Emiel Por, Christian Rau, Christian Soenke, Chris Waring

Proceedings Volume 10707, 107071H (2018) https://doi.org/10.1117/12.2310076

KEYWORDS: Adaptive optics, Sensors, Mirrors, Control systems, Calibration, Software development, Data storage, Image storage, Telescopes, Computer architecture

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Proceedings Article | 25 July 2014 Paper

MUSE instrument software

Gérard Zins, Arlette Pécontal, Marie Larrieu, Nathalie Girard, Aurélien Jarno, Claudio Cumani, Pedro Baksai, Mauro Comin, Mario Kiekebusch, Jens Knudstrup, Dan Popovic, Roland Bacon, Johan Richard, Remko Stuik, Joel Vernet

Proceedings Volume 9152, 915224 (2014) https://doi.org/10.1117/12.2055575

KEYWORDS: Seaborgium, Sensors, Lamps, Stars, Telescopes, Calibration, Control systems, Camera shutters, Spectrographs, Adaptive optics

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Proceedings Article | 18 July 2014 Paper

PC based PLCs and ethernet based fieldbus: the new standard platform for future VLT instrument control

Mario Kiekebusch, Christian Lucuix, Toomas Erm, Gianluca Chiozzi, Michele Zamparelli, Lothar Kern, Roland Brast, Werther Pirani, Roland Reiss, Dan Popovic, Jens Knudstrup, Michel Duchateau, Stefan Sandrock, Nicola Di Lieto

Proceedings Volume 9152, 915207 (2014) https://doi.org/10.1117/12.2056648

KEYWORDS: Photonic integrated circuits, Standards development, Control systems, Motion controllers, Computer programming, Clocks, Interfaces, Commercial off the shelf technology, Astronomy, Computer programming languages

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Proceedings Article | 18 July 2014 Paper

VLT instruments: industrial solutions for non-scientific detector systems

P. Duhoux, J. Knudstrup, P. Lilley, P. Di Marcantonio, R. Cirami, M. Mannetta

Proceedings Volume 9152, 91520I (2014) https://doi.org/10.1117/12.2054718

KEYWORDS: Cameras, Sensors, Charge-coupled devices, Spectrographs, Control systems, Commercial off the shelf technology, Observatories, Computer architecture, Quantum efficiency, CCD cameras

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Recent improvements in industrial vision technology and products together with the increasing need for high performance, cost efficient technical detectors for astronomical instrumentation have led ESO with the contribution of INAF to evaluate this trend and elaborate ad-hoc solutions which are interoperable and compatible with the evolution of VLT standards. The ESPRESSO spectrograph shall be the first instrument deploying this technology. ESO's Technical CCD (hereafter TCCD) requirements are extensive and demanding. A lightweight, low maintenance, rugged and high performance TCCD camera product or family of products is required which can operate in the extreme environmental conditions present at ESO's observatories with minimum maintenance and minimal downtime. In addition the camera solution needs to be interchangeable between different technical roles e.g. slit viewing, pupil and field stabilization, with excellent performance characteristics under a wide range of observing conditions together with ease of use for the end user. Interoperability is enhanced by conformance to recognized electrical, mechanical and software standards. Technical requirements and evaluation criteria for the TCCD solution are discussed in more detail. A software architecture has been adopted which facilitates easy integration with TCCD's from different vendors. The communication with the devices is implemented by means of dedicated adapters allowing usage of the same core framework (business logic). The preference has been given to cameras with an Ethernet interface, using standard TCP/IP based communication. While the preferred protocol is the industrial standard GigE Vision, not all vendors supply cameras with this interface, hence proprietary socket-based protocols are also acceptable with the provision of a validated Linux compliant API. A fundamental requirement of the TCCD software is that it shall allow for a seamless integration with the existing VLT software framework. ESPRESSO is a fiber-fed, cross-dispersed echelle spectrograph that will be located in the Combined-Coudé Laboratory of the VLT in the Paranal Observatory in Chile. It will be able to operate either using the light of any of the UT's or using the incoherently combined light of up to four UT's. The stabilization of the incoming beam is achieved by dedicated piezo systems controlled via active loops closed on 4 + 4 dedicated TCCD's for the stabilization of the pupil image and of the field with a frequency goal of 3 Hz on a 2^nd to 3^rd magnitude star. An additional 9th TCCD system shall be used as an exposure-meter. In this paper we will present the technical CCD solution for future VLT instruments.

Proceedings Article | 18 July 2014 Paper

Motion control solution for new PLC-based standard development platform for VLT instrument control systems

D. Popovic, R. Brast, N. Di Lieto, M. Kiekebusch, J. Knudstrup, C. Lucuix

Proceedings Volume 9152, 915209 (2014) https://doi.org/10.1117/12.2056469

KEYWORDS: Photonic integrated circuits, Motion controllers, Control systems, Optical proximity correction, Switches, Standards development, Picosecond phenomena, Software development, Computer programming, Human-machine interfaces

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Proceedings Article | 8 July 2014 Paper

ERIS: preliminary design phase overview

Harald Kuntschner, Lieselotte Jochum, Paola Amico, Johannes Dekker, Florian Kerber, Enrico Marchetti, Matteo Accardo, Roland Brast, Martin Brinkmann, Ralf Conzelmann, Bernard Delabre, Michel Duchateau, Enrico Fedrigo, Gert Finger, Christoph Frank, Fernando Rodriguez, Barbara Klein, Jens Knudstrup, Miska Le Louarn, Lars Lundin, Andrea Modigliani, Michael Müller, Mark Neeser, Sebastien Tordo, Elena Valenti, Frank Eisenhauer, Eckhard Sturm, Helmut Feuchtgruber, Elisabeth George, Michael Hartl, Reiner Hofmann, Heinrich Huber, Markus Plattner, Josef Schubert, Karl Tarantik, Erich Wiezorrek, Michael Meyer, Sascha Quanz, Adrian Glauser, Harald Weisz, Simone Esposito, Marco Xompero, Guido Agapito, Jacopo Antichi, Valdemaro Biliotti, Marco Bonaglia, Runa Briguglio, Luca Carbonaro, Giovanni Cresci, Luca Fini, Enrico Pinna, Alfio Puglisi, Fernando Quirós-Pacheco, Armando Riccardi, Gianluca Di Rico, Carmelo Arcidiacono, Mauro Dolci

Proceedings Volume 9147, 91471U (2014) https://doi.org/10.1117/12.2055140

KEYWORDS: Adaptive optics, Sensors, Calibration, Mirrors, Stars, Spectrographs, Cameras, Wavefront sensors, Infrared sensors, Telescopes

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The Enhanced Resolution Imager and Spectrograph (ERIS) is the next-generation adaptive optics near-IR imager and spectrograph for the Cassegrain focus of the Very Large Telescope (VLT) Unit Telescope 4, which will soon make full use of the Adaptive Optics Facility (AOF). It is a high-Strehl AO-assisted instrument that will use the Deformable Secondary Mirror (DSM) and the new Laser Guide Star Facility (4LGSF). The project has been approved for construction and has entered its preliminary design phase. ERIS will be constructed in a collaboration including the Max- Planck Institut für Extraterrestrische Physik, the Eidgenössische Technische Hochschule Zürich and the Osservatorio Astrofisico di Arcetri and will offer 1 - 5 μm imaging and 1 - 2.5 μm integral field spectroscopic capabilities with a high Strehl performance. Wavefront sensing can be carried out with an optical high-order NGS Pyramid wavefront sensor, or with a single laser in either an optical low-order NGS mode, or with a near-IR low-order mode sensor. Due to its highly sensitive visible wavefront sensor, and separate near-IR low-order mode, ERIS provides a large sky coverage with its 1’ patrol field radius that can even include AO stars embedded in dust-enshrouded environments. As such it will replace, with a much improved single conjugated AO correction, the most scientifically important imaging modes offered by NACO (diffraction limited imaging in the J to M bands, Sparse Aperture Masking and Apodizing Phase Plate (APP) coronagraphy) and the integral field spectroscopy modes of SINFONI, whose instrumental module, SPIFFI, will be upgraded and re-used in ERIS. As part of the SPIFFI upgrade a new higher resolution grating and a science detector replacement are envisaged, as well as PLC driven motors. To accommodate ERIS at the Cassegrain focus, an extension of the telescope back focal length is required, with modifications of the guider arm assembly. In this paper we report on the status of the baseline design. We will also report on the main science goals of the instrument, ranging from exoplanet detection and characterization to high redshift galaxy observations. We will also briefly describe the SINFONI-SPIFFI upgrade strategy, which is part of the ERIS development plan and the overall project timeline.

Proceedings Article | 12 September 2012 Paper

PIONIER: a status report

J.-B. Le Bouquin, J.-P. Berger, G. Zins, B. Lazareff, L. Jocou, P. Kern, R. Millan-Gabet, W. Traub, P. Haguenauer, O. Absil, J.-C. Augereau, M. Benisty, N. Blind, A. Delboulbe, P. Feautrier, M. Germain, D. Gillier, P. Gitton, M. Kiekebusch, J. Knudstrup, J.-L. Lizon, Y. Magnard, F. Malbet, D. Maurel, F. Menard, M. Micallef, L. Michaud, T. Moulin, D. Popovic, K. Perraut, P. Rabou, S. Rochat, F. Roussel, A. Roux, E. Stadler, E. Tatulli

Proceedings Volume 8445, 84450I (2012) https://doi.org/10.1117/12.925671

KEYWORDS: Stars, Visibility, Calibration, Telescopes, Data modeling, Interferometry, Sensors, Polarization, Photonic integrated circuits, Integrated optics

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Proceedings Article | 22 July 2010 Paper

PIONIER: a visitor instrument for VLTI

J.-P. Berger, G. Zins, B. Lazareff, J.-B. Lebouquin, L. Jocou, P. Kern, R. Millan-Gabet, W. Traub, P. Haguenauer, O. Absil, J.-C. Augereau, M. Benisty, N. Blind, X. Bonfils, A. Delboulbe, P. Feautrier, M. Germain, D. Gillier, P. Gitton, M. Kiekebusch, J. Knudstrup, J.-L. Lizon, Y. Magnard, F. Malbet, D. Maurel, F. Menard, M. Micallef, L. Michaud, S. Morel, T. Moulin, D. Popovic, K. Perraut, P. Rabou, S. Rochat, F. Roussel, A. Roux, E. Stadler, E. Tatulli

Proceedings Volume 7734, 773435 (2010) https://doi.org/10.1117/12.858647

KEYWORDS: Infrared radiation, Interferometry, Current controlled current source, Astatine, Integrated optics, Spectral resolution, K band, Visibility

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Proceedings Article | 19 July 2010 Paper

Evolution of the VLT instrument control system toward industry standards

Mario Kiekebusch, Gianluca Chiozzi, Jens Knudstrup, Dan Popovic, Gerard Zins

Proceedings Volume 7740, 77400T (2010) https://doi.org/10.1117/12.857190

KEYWORDS: Control systems, Photonic integrated circuits, Optical proximity correction, Software development, Sensors, Computer architecture, Standards development, Camera shutters, Motion controllers, Operating systems

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Proceedings Article | 16 September 2004 Paper

Adapting the VLT data flow system for handling high-data rates

Stefano Zampieri, Michele Peron, Olivier Chuzel, Neil Ferguson, Jens Knudstrup, Nick Kornweibel

Proceedings Volume 5493, (2004) https://doi.org/10.1117/12.551221

KEYWORDS: Data archive systems, Databases, Data storage, Data modeling, Local area networks, Computing systems, Observatories, Distributed computing, Control systems, Telescopes

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Proceedings Article | 27 November 2002 Paper

ESO's ArchiveComputing framework

Andreas Wicenec, Jens Knudstrup

Proceedings Volume 4845, (2002) https://doi.org/10.1117/12.461148

KEYWORDS: Data archive systems, Data processing, Observatories, Astronomy, Digital video discs, Telescopes, Information technology, Calibration, Magnetism, Process control

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Proceedings Article | 2 January 2002 Paper

Evolution and adaptation of the VLT data flow system

Jens Knudstrup, Karim Haggouchi, Michele Peron, Peter Quinn, Pascal Ballester, Klaus Banse, Tim Canavan, Alberto Chavan, Nicolas Devillard, Dario Dorigo, Carlos Guirao, Carlo Izzo, Yves Jung, Nick Kornweibel, Cynthia Mavros, Gerhard Mekiffer, Andrea Modigliani, Ralf Palsa, Francesco Ricciardi, Cyrus Sabet, Fabio Sogni, Jakob Vinther, Andreas Wicenec, Bruce Wiseman, Stefano Zampieri

Proceedings Volume 4844, (2002) https://doi.org/10.1117/12.460665

KEYWORDS: Java, Observatories, Computer programming languages, Computer programming, Data archive systems, Virtual colonoscopy, Standards development, Databases, Telescopes, Control systems

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Proceedings Article | 16 June 2000 Paper

NAOS computer-aided control: an optimized and astronomer-oriented way of controlling large adaptive optics systems

Gerard Zins, Francois Lacombe, Jens Knudstrup, David Mouillet, Didier Rabaud, Stephane Marteau, Laurent Rousset-Rouviere, Olivier Rondeaux, Julien Charton, Bertrand Lefort, Gerard Rousset, Norbert Hubin

Proceedings Volume 4009, (2000) https://doi.org/10.1117/12.388412

KEYWORDS: Adaptive optics, Control systems, Telescopes, Wavefront sensors, Calibration, Astronomy, Sensors, Space telescopes, Data archive systems, Turbulence

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Showing 5 of 14 publications

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