Dr. Gert Witvoet Profile

Dr. Gert Witvoet

at TNO

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Gert Witvoet is a dynamics and control specialist at TNO Technical Sciences. He received his MSc degree (cum laude) and PhD degree in mechanical engineering, with a control engineering specialization, from the Eindhoven University of Technology in 2007 and 2011 respectively. His PhD research encompassed the application of control theory to nuclear fusion processes and instabilities. His current research interests include dynamical modeling and analysis, opto-mechatronic systems, control engineering and advanced control. He is also a part-time assistant professor on motion control for scientific instruments at the Eindhoven University of Technology.

Proceedings Article | 30 August 2022 Presentation + Paper

Preliminary design of the Adaptive Secondary Mirror for the European Solar Telescope

Stefan Kuiper, Arjo Bos, Jan de Vreugd, Gert Witvoet, Bert Dekker, Fred Kamphues, Geert Slegtenhorst, Wouter Jonker, Matthew Maniscalco, Bruno Femenía-Castella, Miguel Núñez Cagigal, Jonai Bienes Pérez, Juan Cózar-Castellano, Jose Manuel González-Cava, Angel Mato, Alejandro Mahy Soler Trujillo, Nauzet Vega Reyes

Proceedings Volume 12185, 1218528 (2022) https://doi.org/10.1117/12.2629495

KEYWORDS: Adaptive optics, Actuators, Mirrors, Computer aided design, Silicon carbide, Solar telescopes, Cooling systems, Optical instrument design, Electronics, Telescopes, Interfaces

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Proceedings Article | 11 June 2021 Open Access

GEOQKD: quantum key distribution from a geostationary satellite

Bob Dirks, Ivan Ferrario, Alessandro Le Pera, Daniele Vito Finocchiaro, Marine Desmons, Dorus de Lange, Harry de Man, Arjan J. Meskers, Jaco Morits, Niels M. Neumann, Rudolf Saathof, Gert Witvoet

Proceedings Volume 11852, 118520J (2021) https://doi.org/10.1117/12.2599164

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Proceedings Article | 5 March 2021 Presentation + Paper

In orbit demonstration plans for an optical satellite link between a CubeSat and a ground terminal at TNO

Rudolf Saathof, Arjan J.H. Meskers, Floris van Kempen, Gert Witvoet, Wim Korevaar, Dorus de Lange, Will Crowcombe, Erik Fritz, Martin van de Pol

Proceedings Volume 11678, 1167809 (2021) https://doi.org/10.1117/12.2583381

KEYWORDS: Free space optics, Satellites, Telescopes, Sensors, Satellite communications, Optical testing equipment, Optical fabrication equipment, Optical design, Optical communications, New and emerging technologies

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Proceedings Article | 12 July 2019 Open Access

Performance validation of a high-bandwidth fine steering mirror for optical communications

G. Witvoet, S. Kuiper, A. Meskers

Proceedings Volume 11180, 1118061 (2019) https://doi.org/10.1117/12.2536136

KEYWORDS: Mirrors, Sensors, Optical communications, Actuators, Magnetism, Satellites, Prototyping, Satellite communications, Ferromagnetics, Electronics

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Proceedings Article | 26 March 2019 Paper

First results from the Large Dynamic Range Atomic Force Microscope for overlay metrology

G. Witvoet, J. Peters, S. Kuiper, S. Keyvani, R. Willekers

Proceedings Volume 10959, 109592E (2019) https://doi.org/10.1117/12.2514044

KEYWORDS: Atomic force microscopy, Overlay metrology, Metrology, Interferometers, Actuators, Semiconducting wafers, Motion measurement, Feedback control

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Proceedings Article | 6 July 2018 Paper

Dynamic testing of primary mirror segment supports for the Extremely Large Telescope

Gert Witvoet, Jan Nijenhuis, Lukas Kramer

Proceedings Volume 10700, 107003J (2018) https://doi.org/10.1117/12.2314470

KEYWORDS: Mirrors, Telescopes, Large telescopes, Optical instrument design, Visualization, Structural dynamics, Dynamical systems, Testing and analysis

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The preparations for the design and construction of the Extremely Large Telescope (ELT) are in full swing. One of the most critical components of this enormous telescope is its segmented primary mirror (M1), for which Netherlands Organisation for Applied Scientific Research (TNO), in collaboration with VDL, has designed the mechanical segment support (M1SS) in the period 2015-2016.¹ This new M1SS design is based on the previous M1SS prototypes developed in 2009-2010,² but includes several enhancements to further improve its performance. Specific design drivers were, among others, the serviceability of the M1SS, the introduced surface form error at the segment, and the increased target values for the structural eigenfrequencies. The latter defines the dynamic performance of the structure (including the ~178 kg segment), which needed to be validated experimentally.

From the latest M1SS design one engineering model (EM) and six qualification models (QMs) have been manufactured recently, which have tested intensively to verify their performance. This work will present the test procedure employed to validate the dynamic behavior, describe these dynamic tests and present their results in detail. During these tests a QM, including a dummy segment, has been placed on a heavy rigid structure and three accelerometers have been mounted across the assembly. The structure has then been excited on several strategic locations using a roving hammer technique,³ resulting in a large collection of frequency responses. From these, the eigenfrequencies and accompanying mode shapes have been estimated, resulting in accurate determination of the clocking, lateral, piston and tip/tilt modes of the structure. This allows for correct assessment of the dynamic performance and comparison to the design objectives and finite element model (FEM) predictions.

This procedure has been applied to two different QMs, but since each M1SS consists of a fixed frame (FF) and a removable segment assembly (SA), four different configurations have been tested. The results demonstrate compliance with the challenging design objectives for all QMs, and they show only small variations among the configurations, demonstrating that the dynamic performance of the M1SS design is very reproducible.

Proceedings Article | 17 November 2017 Open Access

An experiment to test in-field pointing for Elisa

Christina Brugger, Bernhard Broll, Ewan Fitzsimons, Ulrich Johann, Wouter Jonke, Stefano Lucarelli, Susanne Nikolov, Martijn Voert, Dennis Weise, Gert Witvoet

Proceedings Volume 10563, 105634D (2017) https://doi.org/10.1117/12.2304152

KEYWORDS: Mirrors, Telescopes, Space telescopes, Interferometers, Optical instrument design, Optical components, Heterodyning, Optical design, Computer aided design, Zerodur

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Proceedings Article | 8 August 2016 Paper

Primary mirror control for large segmented telescopes: combining high performance with robustness

Gert Witvoet, Niek Doelman, Remco den Breeje

Proceedings Volume 9906, 990611 (2016) https://doi.org/10.1117/12.2232054

KEYWORDS: Actuators, Mirrors, Telescopes, Large telescopes, Adaptive control, Feedback control, Feedback loops, Large telescopes, Photoacoustic tomography, Control systems, Reliability

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Proceedings Article | 29 July 2016 Paper

On the performance of the Gaia auto-collimating flat mirror assembly: could it be even better?

A. Bos, G. Witvoet, H. Pereboom, M. Steinbuch

Proceedings Volume 9904, 99044F (2016) https://doi.org/10.1117/12.2233169

KEYWORDS: Mirrors, Computer aided design, Solid modeling, Finite element methods, Modal analysis, 3D modeling, 3D metrology, Computer programming, Aluminum, Sensors

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Proceedings Article | 22 July 2016 Paper

Realization and testing of an active mirror mechanism for in-field pointing in eLISA

Gert Witvoet, Jet Human, Matthew Maniscalco

Proceedings Volume 9912, 99126A (2016) https://doi.org/10.1117/12.2231225

KEYWORDS: Mirrors, Mirrors, Interferometers, Disk lasers, Actuators, Computer programming, Sensors, Computer aided design, Feedback control, Environmental sensing, Space mirrors

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Proceedings Article | 8 March 2016 Paper

Large dynamic range Atomic Force Microscope for overlay improvements

Stefan Kuiper, Erik Fritz, Will Crowcombe, Thomas Liebig, Geerten Kramer, Gert Witvoet, Tom Duivenvoorde, Ton Overtoom, Ramon Rijnbeek, Erwin van Zwet, Anton van Dijsseldonk, Arie den Boef, Marcel Beems, Leon Levasier

Proceedings Volume 9778, 97781B (2016) https://doi.org/10.1117/12.2218249

KEYWORDS: Metrology, Overlay metrology, Scanning probe microscopy, Optical alignment, Lithography, Atomic force microscopy, Atomic force microscope, Image resolution, Nondestructive evaluation, High dynamic range imaging, Semiconducting wafers, Distance measurement, Semiconductors, Interferometers, Sensors

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SPIE Journal Paper | 28 January 2015

Dynamic analysis and control of mirror segment actuators for the European Extremely Large Telescope

Gert Witvoet, Remco den Breeje, Jan Nijenhuis, René Hazelebach, Niek Doelman

JATIS, Vol. 1, Issue 01, 019003, (January 2015) https://doi.org/10.1117/12.10.1117/1.JATIS.1.1.019003

KEYWORDS: Photoacoustic tomography, Actuators, Mirrors, Prototyping, Control systems, Sensors, Virtual colonoscopy, Large telescopes, Linear filtering, Systems modeling

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Proceedings Article | 22 July 2014 Paper

High performance control of mirror segment actuators for the European Extremely Large Telescope

Gert Witvoet, Remco den Breeje, Jan Nijenhuis, René Hazelebach, Niek Doelman

Proceedings Volume 9145, 91451S (2014) https://doi.org/10.1117/12.2056901

KEYWORDS: Photoacoustic tomography, Actuators, Prototyping, Mirrors, Sensors, Telescopes, Large telescopes, Feedback control, Metrology, Thirty Meter Telescope

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