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Mora, A. (author), Biermann, M. (author), Bombrun, A. (author), Boyadjian, J. (author), Chassat, F. (author), Corberand, P. (author), Davidson, M. (author), Doyle, D. (author), Escolar, D. (author), Gielesen, W.L.M. (author), Guilpain, T. (author), Hernandez, J. (author), Kirschner, V. (author), Klioner, S.A. (author), Koeck, C. (author), Laine, B. (author), Lindegren, L. (author), Serpell, E. (author), Tatry, P. (author), Thoral, P. (author)The Gaia all-sky astrometric survey is challenged by several issues affecting the spacecraft stability. Amongst them, we find the focus evolution, straylight and basic angle variations Contrary to pre-launch expectations, the image quality is continuously evolving, during commissioning and the nominal mission. Payload decontaminations and...conference paper 2016
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Bos, A. (author), Witvoet, G. (author), Pereboom, H.P. (author), Steinbuch, M. (author)The Auto-collimating Flat Mirror Assembly (AFMA) simulated the rotation of the Gaia satellite around its vertical axis. As such, it was one of the most important ground support equipment tools to test the payload performance of the Gaia mission. Although the performance of TNO's design during commissioning was excellent, one of the challenges of...conference paper 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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Mora, A. (author), Biermann, M. (author), Brown, A.G.A. (author), Busonero, D. (author), Carminati, L. (author), Carrasco, J.M. (author), Chassat, F. (author), Erdmann, M. (author), Gielesen, W.L.M. (author), Jordi, C. (author), Katz, D. (author), Kohley, R. (author), Lindegren, L. (author), Loeffler, W. (author), Marchal, O. (author), Panuzzo, P. (author), Seabroke, G. (author), Sahlmann, J. (author), Serpell, E. (author), Serraller, I. (author), van Leeuwen, F. (author), van Reeven, W. (author), van den Dool, T.C. (author), Vosteen, L.L.A. (author)The Gaia payload ensures maximum passive stability using a single material, SiC, for most of its elements. Dedicated metrology instruments are, however, required to carry out two functions: monitoring the basic angle and refocusing the telescope. Two interferometers fed by the same laser are used to measure the basic angle changes at the level...conference paper 2014
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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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Hinnen, K. (author), Verhaegen, M. (author), Doelman, N.J. (author), TNO Industrie en Techniek (author)Adaptive optics (AO) is used in ground-based astronomical telescopes to improve the resolution by counteracting the effects of atmospheric turbulence. Most AO systems are based on a simple control law that neglects the temporal evolution of the distortions introduced by the atmosphere. This paper presents a data-driven control design approach...article 2008
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Haaksman, R.P.H. (author), de Vries, C.P. (author), den Herder, J.W. (author), Vosteen, L.L.A. (author), Bokhove, H. (author), Mieremet, A.L. (author)The primary goal of DARWIN is to detect earth-like extrasolar planets and to search for biomarkers. This is achieved by means of nulling interferometry, using three free-flying telescopes and a Beam-Combiner (BC) hub. DARWIN will be able to perform astrophysical imaging with high spectral and spatial resolution. Should one of Darwin's telescope...conference paper 2006
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Kruizinga, B. (author), Visser, H. (author), Pel, J.W. (author), Moddemeijer, K. (author), Smorenburg, C. (author), Technisch Physische Dienst TNO - TH (author)MIRI (the Mid InfraRed Instrument) is one of the focal plane instruments of the James Webb Space Telescope. The instrument comprises a camera and a spectrometer module. The instrument plays the following key roles in the JWST science program. Discovery of the "first light". Assembly of galaxies: history of star formation, growth of black holes,...conference paper 2004
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Swinkels, B.L. (author), Wendrich, T.J. (author), Bhattacharya, N. (author), Wielders, A.A. (author), Braat, J.J.M. (author), Technisch Physische Dienst TNO - TH (author)Space interferometers consisting of several free flying telescopes, such as the planned Darwin mission, require a complex metrology system to make all the components operate as a single instrument. This metrology system consists of various sub-systems to monitor distances, angles and speeds. Our research focuses on one of these sub-systems that...conference paper 2004
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Technisch Physische Dienst TNO - TH (author), Verlaan, A.L. (author), van den Dool, T.C. (author), Braam, B.C. (author), Calvel, B. (author), Sesselman, R. (author), Pöschel, W. (author), Dontsov, D. (author), Vega, I.C. (author), Manske, E. (author), Schuldt, T. (author), Sodnik, Z. (author)A Darwin precursor breadboard, comprising both fine lateral and longitudinal metrology sensors was designed, built and partially tested. The lateral metrology sensor was designed and built by TNO TPD and more than meets the imposed requirements. The longitudinal metrology sensor consists of a dual wavelength interferometer with an integrated...conference paper 2004