Dr. Babak Sedghi Profile

Dr. Babak Sedghi

at European Southern Observatory

SPIE Involvement:

Author

Publications (42)

Proceedings Article | 11 September 2024 Presentation + Paper

ESO European Extremely Large Telescope M2, M3 and M5 mirror cells critical performances verification process

A. Amorós, A. Tomás, J. Andion, M. Redondo, F. Grañena, J. Bernardino, O. Maroto, J. Casalta, M. Mueller, Y. Lammen, J. Pirard, P. Zuluaga, B. Sedghi

Proceedings Volume 13094, 130941I (2024) https://doi.org/10.1117/12.3019732

KEYWORDS: Mirrors, Manufacturing, Tolerancing, Measurement uncertainty, Frequency response, Compliance, Design, Actuators, Interfaces, Sensors

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Proceedings Article | 11 September 2024 Presentation + Paper

Advancements of the ELT M1 figure control loop: edge sensor fault detection and management of actuator non-linearities in a large MIMO system

Andreas Reinacher, Babak Sedghi, Martin Dimmler, Luigi Andolfato

Proceedings Volume 13094, 130941D (2024) https://doi.org/10.1117/12.3016911

KEYWORDS: Actuators, Mirrors, Control systems, Wavefront errors, Matrices, Sensors, Singular value decomposition, Device simulation, Calibration

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The primary mirror of ESO’s Extremely Large Telescope contains 798 hexagonal segments, which are equipped with position actuators (PACT) for segment piston-tip-tilt actuation and edge sensors (ES) to measure the relative segment displacements. PACT and ES are used for M1 figure control, i.e. for maintaining the reference shape of the primary mirror. Due to the sheer number of used sensors (4524), ES failures cannot be excluded. In order to minimize the influence of such failures on observations, an automated approach for ES failure handling has been developed. Besides identification of one or more malfunctioning sensors, replacement values for the erroneous sensor signals are calculated and fed back into the figure loop, enabling uninterrupted observations. The figure loop position actuators are hybrid actuators, combining brushless DC motors for a large range of motion with Piezo actuators for high accuracy and fast settling. Motions larger than the Piezo range (∼10μm) are restricted to a maximum velocity of 100μm/s. Since the figure loop is controlled in modal space such a rate limit introduces non-linearities in this large Multi-Input Multi-Output (MIMO) system resulting in cross-coupling of modes and undesirable transient behavior. A custom management scheme for MIMO systems with actuator non-linearities has been developed and successfully tested. It minimizes overshoots and cross-coupling between modes during transitions considering the PACT velocity limitation. In addition, this scheme simplifies closure of the figure loop from any initial condition. This paper covers advancements in both areas. After a brief description of the relevant subsystems, the algorithm to detect faulty ES is introduced. The closely related calculation of ideal replacement values is shown and simulation results illustrate the effectiveness of the Fault Detection, Isolation & Recovery (FDIR) measures for the ELT M1. Then the theory of considering actuator non-linearities in large MIMO systems is introduced. A custom scheme is derived and applied to the ELT M1 Figure Loop. Simulation results and measurements taken with ESO’s seven segment M1 Test Facility are presented.

Proceedings Article | 28 August 2024 Presentation + Paper

VLTI Unit Telescope coudé train vibration control upgrade for GRAVITY+

Romain Laugier, Julien Woillez, Denis Defrère, Benjamin Courtney-Barrer, Muhammad Salman, Babak Sedghi, Roberto Abuter, Azzurra Bigioli, Maximilian Fabricius, Frank Eisenhauer, Frédéric Gonté, Nicolas Schuhler, Dieter Lutz, Miguel Riquelme, Pierre Bourget, Philippe Neuville, Sylvestre Lacour, Mathias Nowak

Proceedings Volume 13095, 130950M (2024) https://doi.org/10.1117/12.3018146

KEYWORDS: Tunable filters, Vibration, Actuators, Mirrors, Telescopes, Accelerometers, Sensors, Vibration control

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Proceedings Article | 27 August 2024 Poster + Paper

METIS first light imager and spectrograph for the ELT: overview of the near and mid-infrared detector subsystems

Benoît Serra, Derek Ives, Matteo Accardo, Ralf Conzelmann, Serban Leveratto, Eric Mueller, Elizabeth George, Naidu Bezawada, Domingo Alvarez, Babak Sedghi, Leander Mehrgan, Mathias Richerzhagen, Matthias Seidel, Jörg Stegmeier, Mirko Todorovic, Thomas Bertram, Silvia Scheithauer, Peter Bizenberger, Roy van Berkel, Vianak Naranjo, Phil Parr-Burman, Alistair C. Glasse, Alastair Macleod, Michael Meyer, Taylor Tobin, Rory Bowens, Adrian Glauser, Emilie Bouzerand, Bernhard Brandl, Felix Bettonvil

Proceedings Volume 13103, 131031U (2024) https://doi.org/10.1117/12.3019829

KEYWORDS: Sensors, Equipment, Fluctuations and noise, Mosaic detectors, Vibration, Design, Clocks, Signal detection, Imaging systems, Cryogenics

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Proceedings Article | 24 August 2024 Presentation

The impact of micro-vibrations on the METIS instrument

Dennis Dolkens, Mirka Lewinska-Maresca, Dirk Lesman, Babak Sedghi, Dan Pilbauer, Gerd Jakob, Michael Mueller, Harald Baumeister, Armin Huber, António Amorim, Alastair Macleod, Michael Wiest, Felix Bettonvil, Bernhard Brandl

Proceedings Volume 13099, 1309903 (2024) https://doi.org/10.1117/12.3020571

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Proceedings Article | 23 August 2024 Presentation + Paper

ELT system performance optimization at the 50% completion milestone

J. González-Herrera, J. Spyromilio, X. Ariño, M. Brinkmann, B. Sedghi

Proceedings Volume 13099, 130990I (2024) https://doi.org/10.1117/12.3019825

KEYWORDS: Telescopes, Mirrors, Design, Vibration, Simulations, Wind speed, Wavefront sensors, Mirror surfaces, Sensors, Domes

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Proceedings Article | 23 August 2024 Presentation + Paper

Status of the ELT phasing and diagnostic station project

Lorenzo Pettazzi, Thomas Pfrommer, Steffan Lewis, Jose Antonio Abad, Constanza Araujo Hauck, Helen Bedigan, Henri Bonnet, Pierre Bourget, Martin Brinkmann, Elsa Calmette, Angela Cortes, Byron Engler, Christoph Frank, Fernando Gago, Thomas Grudzien, Ivan Maria Guidolin, Andreas Haimerl, Peter Hammersley, Marcus Haug, Renate Hinterschuster, Stefan Huber, Paul Jolley, Aglae Kellerer, Mario Kiekebusch, Jean-Paul Kirchbauer, Johannes Kolmeder, Johan Kosmalski, Ulrich Lampater, Paolo La Penna, Serban Leveratto, Christian Lucuix, Ignacio Lopez Gil, Christopher Mandla, Enrico Marchetti, Christophe Moins, Jerome Paufique, Oliver Pfuhl, Dan Popovic, Babak Sedghi, Sebastien Tordo, Christophe Verinaud, Pablo Zuluaga

Proceedings Volume 13099, 130990J (2024) https://doi.org/10.1117/12.3019119

KEYWORDS: Design, Sensors, Telescopes, Cameras, Wavefront sensors, Interfaces, Compliance, Optical components, Control systems

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Proceedings Article | 29 August 2022 Presentation + Paper

The ELT high level coordination and control

Gianluca Chiozzi, Nick Kornweibel, Ulrich Lampater, Babak Sedghi, Heiko Sommer

Proceedings Volume 12189, 1218919 (2022) https://doi.org/10.1117/12.2630435

KEYWORDS: Telescopes, Control systems, Adaptive optics, Device simulation, Interfaces, Standards development

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Proceedings Article | 26 August 2022 Poster + Paper

ELT M1 edge sensors in the figure control loop: simulations and test results

Andreas Reinacher, Babak Sedghi, Martin Dimmler, Ulrich Lampater

Proceedings Volume 12182, 1218220 (2022) https://doi.org/10.1117/12.2627790

KEYWORDS: Sensors, Wavefronts, Mirrors, Device simulation, Data modeling, Calibration, Telescopes, Actuators, Adaptive optics

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Proceedings Article | 25 August 2022 Presentation + Paper

ESO ELT: vibration performance and budget verification: measured equipment data as input to telescope model

B. Sedghi, P. Zuluaga Ramirez, D. Pilbauer, S. Leveratto, U. Lampater, M. Müller, G. Jakob, M. Haug, M. Accardo, Y. Lammen, J. Abad-Pastor, J. C. González-Herrera

Proceedings Volume 12187, 1218714 (2022) https://doi.org/10.1117/12.2628907

KEYWORDS: Telescopes, Mirrors, Wavefronts, Actuators, Control systems, Adaptive optics, Vibrational characterization, Modeling and simulation, Vibration isolation, Active vibration damping

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SPIE Journal Paper | 6 June 2022

Management of equipment vibration for extremely large telescopes

David Adams, Bartholomew Fordham, Gerd Jakob, Douglas MacMartin, Babak Sedghi, David Schwartz, Hugh Thompson, Tony Travouillon, Byron Smith, Peter Kerrian

JATIS, Vol. 8, Issue 02, 021512, (June 2022) https://doi.org/10.1117/12.10.1117/1.JATIS.8.2.021512

KEYWORDS: Telescopes, Fluctuations and noise, Adaptive optics, Large telescopes, Mirrors, Observatories, Wavefronts, Optical isolators, Cryocoolers, Actuators

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Proceedings Article | 13 December 2020 Presentation + Paper

Results of the ELT M1 position actuators validation campaign

Lorenzo Pettazzi, Babak Sedghi, Andreas Reinacher, Martin Dimmler, Pablo Barriga, Pablo Zuluaga Ramirez, Marc Cayrel, Oliver Dietzel, Michael Ebert, Timo Maier, Andreas Zürcher, Liang Rong, Christoph Stiebel, Pascal Bankovic

Proceedings Volume 11451, 114511W (2020) https://doi.org/10.1117/12.2562594

KEYWORDS: Actuators, Photoacoustic tomography, Mirrors, Spindles, Structural design, Design for manufacturability, Manufacturing, Objectives, Performance modeling

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Proceedings Article | 13 December 2020 Presentation + Paper

ESO ELT - vibration sources characterization: a step forward towards requirement and performance verification

B. Sedghi, P. Zuluaga-Ramírez, U. Lampater, D. Pilbauer, S. Leveratto, G. Jakob, M. Müller, J. Abad-Pastor, J. C. González-Herrera, S. Patti

Proceedings Volume 11450, 114500N (2020) https://doi.org/10.1117/12.2561548

KEYWORDS: Telescopes, Cooling systems, Wavefronts, Systems modeling, Observatories, Performance modeling

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Proceedings Article | 13 December 2020 Poster + Presentation + Paper

ESO-ELT: structural coupling effects between main structure and hosted units

Pablo Zuluaga-Ramírez, Franz Koch, Michael Müller, Babak Sedghi, Michael Esselborn

Proceedings Volume 11450, 114501R (2020) https://doi.org/10.1117/12.2564569

KEYWORDS: Mirrors, Telescopes, Active optics, Control systems, Observatories, Mid-IR, Optical telescopes, Active remote sensing, Optical sensing, Modeling

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Proceedings Article | 13 December 2020 Presentation + Paper

Performance analysis overview for the main structure of the Extremely Large Telescope

Marco Colussi, Leo Colussi, Nathalie Ninane, Jonathan Verspecht, Babak Sedghi, Michael Mueller

Proceedings Volume 11450, 114500R (2020) https://doi.org/10.1117/12.2562512

KEYWORDS: Large telescopes, Telescopes, Mathematical modeling, Vibrometry, Servomechanisms, Finite element methods, Infrared telescopes, Optical instrument design, Resistance, Modeling

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Proceedings Article | 10 July 2018 Paper

Adaptive optics at the ESO ELT

Henri Bonnet, Fabio Biancat-Marchet, Martin Dimmler, Michael Esselborn, Nick Kornweibel, Miska Le Louarn, Pierre-Yves Madec, Enrico Marchetti, Michael Müller, Sylvain Oberti, Jérôme Paufique, Lorenzo Pettazzi, Babak Sedghi, Jason Spyromilio, Stefan Stroebele, Christophe Vérinaud, Elise Vernet

Proceedings Volume 10703, 1070310 (2018) https://doi.org/10.1117/12.2312407

KEYWORDS: Telescopes, Adaptive optics, Wavefronts, Wavefront sensors, Segmented mirrors, Active optics

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Proceedings Article | 6 July 2018 Presentation + Paper

The ELT control system

Gianluca Chiozzi, Mario Kiekebusch, Nick Kornweibel, Ulrich Lampater, Marcus Schilling, Babak Sedghi, Heiko Sommer

Proceedings Volume 10707, 107070U (2018) https://doi.org/10.1117/12.2312164

KEYWORDS: Control systems, Telescopes, Safety, Adaptive optics, Computing systems, Standards development, Sensors, Mirrors, Actuators

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The Extremely Large Telescope (ELT) is a 39 meters optical telescope under construction at an altitude of about 3000m in the Chilean Atacama desert. The optical design is based on a novel five-mirror scheme and incorporates adaptive optics mirrors. The primary mirror consists of 798 segments, each 1.4 meters wide[1]. The control of this telescope and of the instruments that will be mounted on it is very challenging, because of its size, the number of sensors and actuators, the computing performance required for the phasing of the primary mirror, the adaptive optics and the correlation between all the elements in the optical path. In this paper we describe the control system architecture, emerging from scientific and technical requirements. We also describe how the procurement strategy (centered on industrial contracts at subsystem level) affects the definition of the architecture and the technological choices. We first introduce the global architecture of the system, with Local Control Systems and a Supervisory Control layer. The Local Control Systems is astronomy-agnostic and isolate the control of the subsystems procured through industrial contracts. The Supervisory Control layer is instead responsible for coordinating the operation of the different subsystems to realize the observation cases identified for the operation of the telescope. The control systems of the instruments interface with the telescope using a well-defined and standardized interface. To facilitate the work of the Consortia responsible for the construction of the instruments, we provide an Instrumentation Control Software Framework. This will ensure uniformity in the design of the control systems across instruments, making maintenance easier. This approach was successfully adopted for the instrumentation of the Very Large Telescope facility. We will analyze the process that was followed for defining the architecture from the requirements and use cases and to produce a design that addresses the technical challenges.

Proceedings Article | 17 August 2016 Paper

Analyzing the impact of vibrations on E-ELT primary segmented mirror

B. Sedghi, M. Müller, M. Dimmler

Proceedings Volume 9911, 991111 (2016) https://doi.org/10.1117/12.2232683

KEYWORDS: Adaptive optics, Spatial frequencies, Error analysis, Segmented mirrors, Mirrors, Wavefronts, Observatories, Telescopes, Wavefronts, Actuators, Motion models

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Proceedings Article | 27 July 2016 Paper

AOF: standalone test results of GALACSI

P. La Penna, E. Aller Carpentier, J. Argomedo, R. Arsenault, R. Conzelmann, B. Delabre, R. Donaldson, F. Gago, P. Gutierrez-Cheetam, N. Hubin, P. Jolley, M. Kiekebusch, J. P. Kirchbauer, B. Klein, J. Kolb, H. Kuntschner, M. Le Louarn, J.-L. Lizon, P.-Y. Madec, A. Manescau, L. Mehrgan, S. Oberti, J. Quentin, B. Sedghi, S. Ströbele, M. Suárez Valles, C. Soenke, S. Tordo, J. Vernet

Proceedings Volume 9909, 99092Z (2016) https://doi.org/10.1117/12.2232984

KEYWORDS: Adaptive optics, Sensors, Mirrors, Picosecond phenomena, Calibration, Telescopes, Turbulence, Cameras, Stars, Point spread functions

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Proceedings Article | 27 July 2016 Paper

Improving E-ELT M1 prototype hard position actuators with active damping

B. Sedghi, M. Dimmler, M. Müller, N. Kornweibel

Proceedings Volume 9906, 99062W (2016) https://doi.org/10.1117/12.2232637

KEYWORDS: Mirrors, Sensors, Control systems, Actuators, Prototyping, Control systems, Photoacoustic tomography, Telescopes, Computer programming, Motion estimation, Image segmentation

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Proceedings Article | 5 July 2016 Paper

E-ELT vibration modeling, simulation, and budgeting

B. Sedghi, M. Müller, G. Jakob

Proceedings Volume 10012, 1001202 (2016) https://doi.org/10.1117/12.2200926

KEYWORDS: Wavefronts, Performance modeling, Device simulation, Telescopes, Control systems, Vibration simulation, Integrated modeling, Vibration control, Error analysis, Mirrors, Interfaces, Adaptive optics, Motion models, Finite element methods, Observatories

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Proceedings Article | 22 July 2014 Paper

The secondary mirror concept for the European Extremely Large Telescope

Michael Mueller, Marc Cayrel, Henri Bonnet, Emanuela Ciattaglia, Michael Esselborn, Franz Koch, Herve Kurlandczyk, Lorenzo Pettazzi, Andrew Rakich, Babak Sedghi

Proceedings Volume 9145, 91451I (2014) https://doi.org/10.1117/12.2055109

KEYWORDS: Mirrors, Telescopes, Wavefronts, Adaptive optics, Monochromatic aberrations, Computer aided design, Actuators, Photoacoustic tomography, Space telescopes, Manufacturing

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Proceedings Article | 22 July 2014 Paper

Status of E-ELT M5 scale-one demonstrator

Pablo Barriga, Babak Sedghi, Martin Dimmler, Nick Kornweibel

Proceedings Volume 9145, 91451O (2014) https://doi.org/10.1117/12.2056821

KEYWORDS: Actuators, Control systems, Mirrors, Standards development, Prototyping, Control systems design, Field programmable gate arrays, Telescopes, Position sensors, Telecommunications

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Proceedings Article | 22 July 2014 Paper

Improved E-ELT subsystem and component specifications, thanks to M1 test facility

M. Dimmler, J. Marrero, S. Leveque, Pablo Barriga, B. Sedghi, N. Kornweibel

Proceedings Volume 9145, 91451K (2014) https://doi.org/10.1117/12.2055142

KEYWORDS: Photoacoustic tomography, Control systems, Sensors, Interfaces, Prototyping, Actuators, Telescopes, Mirrors, Switches, Solar concentrators

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Proceedings Article | 21 July 2014 Paper

GALACSI integration and functional tests

P. La Penna, S. Ströbele, E. Aller Carpentier, J. Argomedo, R. Arsenault, R. Conzelmann, B. Delabre, R. Donaldson, M. Duchateau, E. Fedrigo, F. Gago, N. Hubin, J. Quentin, P. Jolley, M. Kiekebusch, J. Kirchbauer, B. Klein, J. Kolb, H. Kuntschner, M. Le Louarn, J. Lizon, P. Madec, A. Manescau, L. Mehrgan, B. Sedghi, M. Suarez Valles, C. Soenke, S. Tordo, J. Vernet, S. Zampieri

Proceedings Volume 9148, 91482V (2014) https://doi.org/10.1117/12.2055159

KEYWORDS: Cameras, Adaptive optics, Mirrors, Sensors, Calibration, Optical fibers, Copper, Telescopes, Sodium, Optical filters

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Proceedings Article | 17 September 2012 Paper

Active damping strategies for control of the E-ELT field stabilization mirror

B. Sedghi, M. Dimmler, M. Mueller

Proceedings Volume 8444, 84441Z (2012) https://doi.org/10.1117/12.925123

KEYWORDS: Mirrors, Actuators, Zerodur, Position sensors, Sensors, Prototyping, Telescopes, Electromechanical design, Control systems, Electronic filtering

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Proceedings Article | 17 September 2012 Paper

E-ELT M1 test facility

M. Dimmler, J. Marrero, S. Leveque, P. Barriga, B. Sedghi, M. Mueller

Proceedings Volume 8444, 84441Y (2012) https://doi.org/10.1117/12.926146

KEYWORDS: Photoacoustic tomography, Prototyping, Sensors, Actuators, Interfaces, Telescopes, Control systems, Tolerancing, Mirrors, Glasses

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Proceedings Article | 10 November 2011 Paper

E-ELT active optics system modeling and performance evaluation

H. Bonnet, M. Esselborn, M. Müller, B. Sedghi, F. Koch

Proceedings Volume 8336, 83360P (2011) https://doi.org/10.1117/12.915741

KEYWORDS: Wavefronts, Error analysis, Adaptive optics, Mirrors, Telescopes, Wave propagation, Actuators, Performance modeling, Systems modeling, Geometrical optics

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Proceedings Article | 10 November 2011 Paper

Local effects on E-ELT global performance: two examples for requirement verification

B. Sedghi, M. Muller, F. Koch, L. Pettazzi

Proceedings Volume 8336, 83360O (2011) https://doi.org/10.1117/12.915504

KEYWORDS: Telescopes, Mirrors, Device simulation, Instrument modeling, Motion models, Wavefronts, Actuators, Space telescopes, Performance modeling, Control systems

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Proceedings Article | 10 November 2011 Paper

E-ELT modeling and simulation toolkits: philosophy and progress status

B. Sedghi, M. Muller, H. Bonnet, M. Esselborn, M. Le Louarn, R. Clare, F. Koch

Proceedings Volume 8336, 833606 (2011) https://doi.org/10.1117/12.915506

KEYWORDS: Adaptive optics, Mirrors, Telescopes, Device simulation, Systems modeling, Wavefronts, Motion models, Actuators, Active optics, Error analysis

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Proceedings Article | 10 November 2011 Paper

Dynamical simulation of E-ELT segmented primary mirror

B. Sedghi, M. Muller, B. Bauvir

Proceedings Volume 8336, 83360D (2011) https://doi.org/10.1117/12.915503

KEYWORDS: Actuators, Photoacoustic tomography, Mirrors, Sensors, Device simulation, Control systems, Telescopes, Motion models, MATLAB, Computer simulations

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Proceedings Article | 6 August 2010 Paper

Field stabilization (tip/tilt control) of E-ELT

B. Sedghi, M. Müller, H. Bonnet, M. Dimmler, B. Bauvir

Proceedings Volume 7733, 773340 (2010) https://doi.org/10.1117/12.856876

KEYWORDS: Wavefronts, Telescopes, Mirrors, Control systems, Interference (communication), Computer programming, Linear filtering, Wavefront sensors, Electronic filtering, Error analysis

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Proceedings Article | 5 August 2010 Paper

Dynamical aspects in control of E-ELT segmented primary mirror (M1)

B. Sedghi, M. Müller, M. Dimmler, B. Bauvir, T. Erm, H. Bonnet, M. Cayrel

Proceedings Volume 7733, 77332E (2010) https://doi.org/10.1117/12.856885

KEYWORDS: Actuators, Photoacoustic tomography, Sensors, Adaptive optics, Telescopes, Segmented mirrors, Control systems, Wavefronts, Mirrors, Feedback loops

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Proceedings Article | 28 July 2010 Paper

Main axes control of E-ELT

B. Sedghi, M. Müller, T. Erm, E. Brunetto, F. Koch, N. Di Lieto

Proceedings Volume 7733, 77331G (2010) https://doi.org/10.1117/12.856871

KEYWORDS: Telescopes, Computer programming, Wavefronts, Control systems, Head, Optical instrument design, Motion models, Device simulation, Error analysis, Sensing systems

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Proceedings Article | 22 July 2010 Paper

Friction drive characterization breadboard: test results

B. Sedghi, C. Lucuix, J. M. Tortolani, E. Brunetto, C. Delrez, E. Gabriel

Proceedings Volume 7739, 77391K (2010) https://doi.org/10.1117/12.856979

KEYWORDS: Computer programming, Data modeling, Feedback signals, Control systems, Telescopes, Motion models, Domes, Space telescopes, Spherical lenses, Motion measurement

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Proceedings Article | 17 July 2008 Paper

E-ELT primary mirror control system

M. Dimmler, T. Erm, B. Bauvir, B. Sedghi, H. Bonnet, M. Müller, A. Wallander

Proceedings Volume 7012, 70121O (2008) https://doi.org/10.1117/12.790476

KEYWORDS: Mirrors, Control systems, Photoacoustic tomography, Adaptive optics, Sensors, Spatial frequencies, Telescopes, Actuators, Wavefronts, Curium

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Proceedings Article | 10 July 2008 Paper

Acceleration feedback control on an AT

B. Sedghi, B. Bauvir, M. Dimmler

Proceedings Volume 7012, 70121Q (2008) https://doi.org/10.1117/12.789333

KEYWORDS: Data modeling, Telescopes, Gallium, Data centers, Velocity measurements, Feedback control, Linear filtering, Calcium, Francium, Observatories

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Proceedings Article | 9 July 2008 Paper

An integrated model of the European Extremely Large Telescope

Torben Andersen, Anita Enmark, Peter Linde, Mette Owner-Petersen, Anders Sjöström, Franz Koch, Michael Müller, Lothar Noethe, Babak Sedghi

Proceedings Volume 7017, 70170S (2008) https://doi.org/10.1117/12.789025

KEYWORDS: Adaptive optics, Telescopes, Systems modeling, Mirrors, Wavefront sensors, Integrated modeling, Actuators, Deformable mirrors, Servomechanisms, Sensors

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Proceedings Article | 6 July 2006 Paper

ASM: scaled down active segmented mirror developed to simulate a segmented primary mirror

Christophe Dupuy, Christoph Frank, Frédéric Gonté, Constanza Araujo Hauck, Roland Brast, Regina Esteves, Matti Nylund, Babak Sedghi, Frédéric Derie

Proceedings Volume 6273, 62733E (2006) https://doi.org/10.1117/12.672918

KEYWORDS: Mirrors, Prototyping, Actuators, Control systems, Segmented mirrors, Electronics, Computer aided design, Sensors, Telescopes, Observatories

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Proceedings Article | 26 June 2006 Paper

The active phasing experiment: Part II. Design and developments

F. Gonte, N. Yaitskova, F. Derie, C. Araujo, R. Brast, B. Delabre, P. Dierickx, C. Dupuy, C. Frank, S. Guisard, R. Karban, L. Noethe, B. Sedghi, I. Surdej, R. Wilhelm, M. Reyes, S. Esposito, M. Langlois

Proceedings Volume 6267, 626730 (2006) https://doi.org/10.1117/12.672057

KEYWORDS: Sensors, Telescopes, Mirrors, Segmented mirrors, Image segmentation, Metrology, Control systems, Device simulation, Electronics, Charge-coupled devices

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Proceedings Article | 22 June 2006 Paper

Perturbation rejection control strategy for OWL

B. Sedghi, L. Mišković, M. Dimmler

Proceedings Volume 6271, 62710L (2006) https://doi.org/10.1117/12.671462

KEYWORDS: Control systems, Telescopes, Segmented mirrors, Actuators, Device simulation, Sensors, Systems modeling, Mirrors, Wavefronts, Adaptive optics

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Proceedings Article | 28 September 2004 Paper

OWL opto-mechanics: phase A

Enzo Brunetto, Martin Dimmler, Franz Koch, Marco Quattri, Michael Muller, Babak Sedghi

Proceedings Volume 5489, (2004) https://doi.org/10.1117/12.555915

KEYWORDS: Telescopes, Actuators, Space telescopes, Mirrors, Optical instrument design, Optomechanical design, Optical components, Optical design, Finite element methods, Wind measurement

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Showing 5 of 42 publications

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