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Kuiper, S. (author), Jonker, W.A. (author), Maniscalco, M.P. (author), Priem, H. (author), Coolen, C. (author), Chun, M. (author), Baranec, C. (author), Lu, J. (author), Lai, O. (author)TNO and industrial partners VDL ETG, L3Harris and Hyperion are developing a novel Adaptive Secondary Mirror (ASM) for Ground Layer Adaptive Optics (GLAO) at the University of Hawaii’s 88-inch telescope on Mauna Kea. The ASM is based on a unique actuator principle which delivers a >30µm PV 99% linear stroke at a very high efficiency in terms of...conference paper 2019
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van Kooten, M.A.M. (author), Doelman, N.J. (author), Kenworthy, M. (author)In an adaptive optics (AO) system, finite time delays contribute a relatively large amount to the overall wavefront error. The temporal error, due to the time delays, adds to the speckle halo which is visible in the science plane of a high contrast imaging (HCI) instrument. The halo limits the inner working angle, preventing HCI from probing...conference paper 2018
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Witvoet, G. (author), Nijenhuis, J.R. (author), Kramer, L. (author)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...conference paper 2018
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van Kooten, M. (author), Doelman, N.J. (author), Kenworthy, M. (author)Current high contrast imaging systems are limited at small angular separations, preventing the direct imaging of Earth-size exoplanets close to their host stars. One primary cause of this is the performance of the extreme adaptive optics (AO) system which is dominated by the servo-lag error at small angular separations. Prediction can be used to...conference paper 2017
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Huisman, R. (author), Paalvast, S. (author), Brandl, B.R. (author), van den Dool, T.C. (author), Eggens, M. (author), Janssen, H. (author), Aitink-Kroes, G. (author), Molster, F. (author), Teuwen, M. (author), Venema, L. (author), Jayawardhana, B. (author)We present the main results of the performance test campaign of the Mid-Infrared European Extremely Large Telescope Imager and Spectrograph (METIS) Cold Chopper Demonstrator (MCCD). This tip/tilt mirror, which operates at a temperature of 77 K, is one of the critical components in the METIS for the European Extremely Large Telescope. The...article 2016
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Klop, W.A. (author), Verlaan, A.L. (author)The CHEOPS mission (CHaracterising ExOPlanet Satellite) is dedicated to searching for exoplanetary transits by performing ultra-high precision photometry on bright stars already known to host planets. A 32cm diameter on-axis Ritchey-Chrétien telescope is used for imaging onto a single cooled detector. With integration times up to 48 hours the...conference paper 2016
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Bos, A. (author), Henselmans, R. (author), Rosielle, P.C.J.N. (author), Steinbuch, M. (author), te Voert, M.J.A. (author)The baseline design of the European Extremely Large Telescope features a telescope with a 39-meter-class primary mirror (M1), consisting of 798 hexagonal segments. A measurement machine design is presented based on a non-contact single-point scanning technique, capable of measuring the form error of each segment with nanometer uncertainty, fast,...conference paper 2014
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Meisner, J.A. (author), Jaffe, W.J. (author), le Poole, R.S. (author)The NOVA Fringe Tracker (NFT) is a proposed solution tóthe call by ESO for a second generation fringe tracking facility. This instrument at the VLTI will enable the cophasing of up tó6 telescopes simultaneously. Using broad band optics with detection from 1.2 tó2.4 microns, a unique configuration is employed that eliminates so-called ...conference paper 2012
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Rijnveld, N. (author), Henselmans, R. (author), Nijland, B.A.H. (author)One of the critical elements in the Four Laser Guide Star Facility (4LGSF) for the ESO Very Large Telescope (VLT) is the Optical Tube Assembly (OTA), consisting of a stable 20x laser beam expander and an active tip/tilt mirror, the Field Selector Mechanism (FSM). This paper describes the design and performance testing of the FSM. The driving...conference paper 2011
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TNO Industrie en Techniek (author), Hamelinck, R. (author), Rosielle, N. (author), Steinbuch, M. (author), Doelman, N.J. (author)New deformable mirror technology is developed by the Technische Universiteit Eindhoven, Delft University of Technology and TNO Science and Industry. Several prototype adaptive deformable mirrors are realized mirrors, up to 427 actuators and ∅150mm diameter, with characteristics suitable for future AO systems. The prototypes consist of a 100µm...conference paper 2010
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TNO Industrie en Techniek (author), Fraanje, P.R. (author), Doelman, N.J. (author), Verhaegen, M. (author)Using a matching pursuit (MP) approach to solve least squares problems with a sparsity constraint sparse controllers are computed to compensate for atmospheric turbulence. The method has been validated by simulation of von Kármán turbulence with frozen flow for the case of prediction, reconstruction and control.conference paper 2010
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Snik, F. (author), Rietjens, J.H.H. (author), van Harten, G. (author), Stam, D.M. (author), Keller, C.U. (author), Smit, J.M. (author), Laan, E.C. (author), Verlaan, A.L. (author), ter Horst, R. (author), Navarro, R. (author), Wielinga, K. (author), Moon, S.G. (author), Voors, R. (author)SPEX (Spectropolarimeter for Planetary EXploration) is an innovative, compact instrument for spectropolarimetry, and in particular for detecting and characterizing aerosols in planetary atmospheres. With its ∼1-liter volume it is capable of full linear spectropolarimetry, without moving parts. The degree and angle of linear polarization of the...conference paper 2010
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TNO Industrie en Techniek (author), Valenziano, L. (author), Zerbi, F.M. (author), Cimatti, A. (author), Bianco, A. (author), Bonoli, C. (author), Bortoletto, F. (author), Bulgarelli, A. (author), Butler, R.C. (author), Content, R. (author), Corcione, L. (author), Rosa, A.de (author), Franzetti, P. (author), Garilli, B. (author), Gianotti, F. (author), Giro, E. (author), Grange, R. (author), Leutenegger, P. (author), Ligori, S. (author), Martin, L. (author), Mandolesi, N. (author), Morgante, G. (author), Nicastro, L. (author), Riva, M. (author), Robberto, M. (author), Sharples, R. (author), Spanó, P. (author), Talbot, G. (author), Trifoglio, M. (author), Wink, R. (author), Zamkotsian, F. (author)The Euclid Near-Infrared Spectrometer (E-NIS) Instrument was conceived as the spectroscopic probe on-board the ESA Dark Energy Mission Euclid. Together with the Euclid Imaging Channel (EIC) in its Visible (VIS) and Near Infrared (NIP) declinations, NIS formed part of the Euclid Mission Concept derived in assessment phase and submitted to the...conference paper 2010
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TNO Industrie en Techniek (author), Nijenhuis, J.R. (author), Hamelinck, R.F.M.M. (author), Braam, B.C. (author), Cayrel, M. (author)The largest optical telescope in the world will be the E-ELT. Its primary mirror will be 42m in diameter. This mirror will consist of 984 hexagonal segments that are all individually supported. Each mirror will be controlled in six DOF while local shaping of the segments is provided by so called warping harnesses. These will correct for focus,...conference paper 2010
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Braam, B.C. (author), Meijer, E.A. (author), Nijenhuis, J.N. (author), Vink, R.J.P. (author), Kamphues, F.G. (author), TNO Industrie en Techniek (author)TNO is developing the Basic Angle Monitoring Opto-Mechanical Assembly for the GAIA mission of ESA, a space telescope that will create a map of the universe including distant stars and planets. GAIA is being built by EADS Astrium and scheduled for launch in 2011. Due to its stability and hardness properties, Silicon Carbide has been chosen for...conference paper 2009
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TNO Industrie en Techniek (author), Kamphues, F.G. (author), Nijenhuis, J.R. (author), den Breeje, R. (author), van den Dool, T.C. (author), Ponsioen, J. (author)The European Southern Observatory (ESO) has started technology development for their next generation optical telescope. Due to its ultra large collecting area, The European Extremely Large Telescope (E-ELT) will require a paradigm shift in telescope design to keep the overall program cost at an acceptable level. The E-ELT will feature a 42 meter...conference paper 2008
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TNO Industrie en Techniek (author), Nijenhuis, J. (author), Visser, H. (author), de Man, H. (author), Dekker, B. (author), Mekking, J. (author), Kamphues, F.G. (author)ESO is building the Phase Referenced Imaging and Microarcsecond Astronomy (PRIMA) facility for the Very Large Telescope Interferometer (VLTI) in Chile. PRIMA will enable interferometric imaging of very faint objects and high precision astrometry with both Unit (UT) and Auxiliary (AT) telescopes. The PRIMA facility consists of four major sub...conference paper 2008
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Atad-Ettedgui, E. (author), Peacocke, T. (author), Montgomery, D. (author), Gostick, D. (author), McGregor, H. (author), Cliff, M. (author), Saunders, I. (author), Ploeg, L. (author), Dorrepaal, M. (author), van Venrooij, B. (author), TNO Industrie en Techniek (author)This paper describes the opto-mechanical design of a large instrument for sub-nun, SCUBA-2, to be commissioned at JCMT. The scientific requirements, specially the large fov and the constraints of the telescope mechanical structure, lead to a complex optical design using freeform aluminium minors. The mechanical design is also challenging with...conference paper 2006
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TNO Industrie en Techniek (author), Ellenbroek, R.M.L. (author), Verhaegen, M. (author), Doelman, N.J. (author), Hamelinck, R.F.M.M. (author), Rosielle, P.C.J.N. (author), Steinbuch, M. (author)Future large optical telescopes require adaptive optics (AO) systems whose deformable mirrors (DM) have ever more degrees of freedom. This paper describes advances that are made in a project aimed to design a new AO system that is extendible to meet tomorrow's specifications. Advances on the mechanical design are reported in a companion paper ...conference paper 2006
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TNO Industrie en Techniek (author), van Veggel, M. (author), Wielders, A.A. (author), van Brug, H. (author), Rosielle, P.C.J.N. (author), Nijmeijer, H. (author)The GAI A satellite will make a 3-D map of our Galaxy with measurement accuracy of 10 microarcseconds using two astrometric telescopes. The angle between the lines-of-sight of the two telescopes will be monitored using the Basic Angle Monitoring system with 1 microarcsecond accuracy. This system will be an interferometer consisting of a number...conference paper 2005
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