Dr. Alexander Pramskiy Profile

Dr. Alexander Pramskiy

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Publications (6)

Proceedings Article | 25 July 2024 Presentation + Paper

The fibre target alignment process of the 4MOST instrument

Roland Winkler, Ingo Stilz, Alexander Pramskiy, Weijia Sun, Pasko Roje, Thomas Liebner, Daniel Sablowski, Steffen Frey, Gerard Zins, Scott Smedley

Proceedings Volume 13101, 131010L (2024) https://doi.org/10.1117/12.3020482

KEYWORDS: Telescopes, Metrology, Cameras, Device simulation, Equipment, Calibration, Sensors

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The 4-meter Multi-Object Spectroscopic Telescope (4MOST) instrument uses 2436 individually positioned optical fibres to couple the light of targets into its spectrographs. The Fibre Target Alignment (FTA) software controls all aspects of the 4MOST instrument that are involved to position the 2448 spines of the AESOP positioner to their target locations closer than 10µm RMS, within 90 seconds. The AESOP fibre positioner provides a HTML interface which is used by the FTA software to command spine movements. The metrology system consists of four cameras, and a sophisticated software package to measure the location of fibres, which are moved by the AESOP spines. Spines reach their target typically after six to eight iterative movements, which are interlaced with metrology frames. The metrology software is capable of taking 4 images simultaneously, and reconstructing fibre positions to within 3μm RMS within five seconds. We present the FTA control software architecture, the interaction of sub-components and the different operation modes of the system. Especially the concurrent and simultaneous control of four metrology camera processes. Due to the complexity of the system, comprehensive debugging and visualization tools have been developed which allow a detailed understanding and interaction of the entire system. The graphical tool provides feedback for each individual camera stream and their combined result. It provides statistics and tools to manipulate individual spines, especially to recover them in case of entanglement. To develop the control software, a full end-to-end simulator has been created, which closes the loop between metrology image simulation, simulated fibre positioning and all control aspects in between. The metrology system uses the current spine position as presented by the AESOP positioner to render metrology camera images. Analysis and downstream computation is identical to the live software. When commanded to move spines, The AESOP simulator executes the identical steps to move spines, except sending electrical signals. After which it returns the expected spine positions after their move, which is taken as input for the next FTA iteration.

Proceedings Article | 18 July 2024 Poster + Paper

Preliminary characterization and verification of 4MOST in Europe

Genoveva Micheva, Olga Bellido-Tirado, Joar Brynnel, Steffen Frey, Andreas Kelz, Roelof de Jong, Allar Saviauk, Roland Winkler, Florence Laurent, Walter Seifert, Ingo Stilz, Florian Rothmaier, Alexander Pramskiy, Michael Lehmitz, Wolfgang Gaessler, Ioannis Politopoulos, Jonathan Irwin, Michael Irwin, Jens-Kristian Krogager, Gérard Zins, Andreas Quirrenbach, Wenli Xu

Proceedings Volume 13096, 1309623 (2024) https://doi.org/10.1117/12.3019870

KEYWORDS: Spectrographs, Calibration, Fiber science, Data acquisition, Telescopes, Equipment, Xenon, Observational astronomy

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Proceedings Article | 29 August 2022 Presentation + Paper

4MOST metrology system lab calibration and performance

Roland Winkler, Thomas Liebner, Deborah Sobiella, Carlos Rodriguez Alvarez, Thomas Fechner, Wilbert Bittner, Dietrich Feuerstein, Bjorn Leseberg, Thomas Hahn, Ulrike Lemke, Daniel Sablowski, Alexander Pramskiy, Florian Rothmaier, Ingo Stilz, Michael Lehmitz, Scott Smedley, Hakan Onel, Steffen Frey

Proceedings Volume 12188, 121882A (2022) https://doi.org/10.1117/12.2630358

KEYWORDS: Cameras, Mirrors, Calibration, Telescopes, Metrology, Spine, Optical alignment, Sensors, Optical components, Geometrical optics

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Proceedings Article | 6 July 2018 Presentation + Paper

Commissioning of the adaptive optics supported LUCI instruments at the Large Binocular Telescope: results

Jochen Heidt, Alexander Pramskiy, David Thompson, Walter Seifert, Roland Gredel, Doug Miller, Greg Taylor, Simone Esposito, Alfio Puglisi, Enrico Pinna, Andreas Quirrenbach

Proceedings Volume 10702, 107020B (2018) https://doi.org/10.1117/12.2313506

KEYWORDS: Stars, Imaging spectroscopy, Adaptive optics, Sensors, Spectroscopy, Remote sensing, Cameras, Spectroscopes, Image quality, Telescopes

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Proceedings Article | 6 July 2018 Paper

The LUCI@LBT twins: instrument flexure control

Alexander Pramskiy, David Thompson, Jochen Heidt, Walter Seifert, Roland Gredel, Andreas Quirrenbach

Proceedings Volume 10702, 107022X (2018) https://doi.org/10.1117/12.2313202

KEYWORDS: Imaging spectroscopy, Sensors, Mirrors, Spectroscopy, Spectroscopes, Cameras, Telescopes, Adaptive optics, Nondestructive evaluation, Detection and tracking algorithms

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Proceedings Article | 26 July 2016 Paper

The 4MOST facility control software

Alexander Pramskiy, Holger Mandel, Florian Rothmaier, Ingo Stilz, Roland Winkler, Thomas Hahn

Proceedings Volume 9913, 991336 (2016) https://doi.org/10.1117/12.2232606

KEYWORDS: Spectrographs, Telescopes, Control systems, Calibration, Photonic integrated circuits, Metrology, Sensors, Charge-coupled devices, Camera shutters, Electroluminescent displays

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Showing 5 of 6 publications

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