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Nijenhuis, J.R. (author), Jonker, W.A. (author), Kamphues, F.G. (author)TNO, in close cooperation with Demcon, has designed the Laser Projection Subsystem (LPS) for ESO’s Extremely Large Telescope (ELT). The ELT LPS will consist of up to 8 laser projection subunits. The design is based on the Four Laser Guide Star Facility (4LGSF), built for the ESO Very Large Telescope (VLT) (5). The VLT AO system has been...conference paper 2022
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Nijenhuis, J.R. (author), van der Heiden, N. (author), Jonker, W.A. (author)TMT will be a telescope with 492 segments making up the primary mirror. Each of these segments is supported with a highly sophisticated Segment Support Assembly (SSA) and each of them is to be tested for acceptance using a tool called SMATT. This tool will be mounted on top of each SSA and provides the load distribution applied to its 27 support...conference paper 2022
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Fiore, A. (author), Galeotti, F. (author), Liu, T. (author), Petruzzella, M. (author), Sersic-Vollenbroek, I. (author), Lindgren, G.G. (author), Pagliano, F. (author), van Otten, F.W.M. (author), van Veldhoven, P.J. (author), Pogoretskiy, V. (author), Jiao, Y. (author), Mohtashami, A. (author), Sadeghian Marnani, H. (author), van der Heijden, R.W. (author)In this talk we will present recent process on the integration of nano-opto-electro-mechanical sensors with photonic circuits and optical read-out, showing a route towards fully-integrated optical sensing.conference paper 2021
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Klop, W.A. (author), Saathof, R. (author), Doelman, N.J. (author), Gruber, M. (author), Moens, T.M.N. (author), Osorio Tamayo, C.I. (author), Duque, C.M. (author)Free space optical (FSO) satellite communications has very attractive properties for Quantum Key Distribution(QKD). The quantum channel loss and noise are major factors in setting the maximum achievable secure key rate of QKD systems. Primarily for a LEO satellite node and the BB84 protocol a number of technologies are proposed to reduce the...conference paper 2021
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Galeotti, F. (author), Sersic-Vollenbroek, I. (author), Petruzzella, M. (author), Pagliano, F. (author), Zobenica, Z. (author), van Otten, F.W.M. (author), Sadeghian Marnani, H. (author), van der Heijden, R. (author), Fiore, A. (author)Displacement sensing at the nanoscale is required in many applications, including accelerometry, mass sensing and atomic force microscopy. Miniaturization of the sensing elements and integration of the read-out is key in achieving low cost, high resolution and high speed. Here, we present a novel integrated nano-opto-electro-mechanical device...conference paper 2018
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de Goeij, B.T.G. (author), Otter, G.C.J. (author), van Wakeren, J.M.O. (author), Veefkind, J.P. (author), Vlemmix, T. (author), Ge, X. (author), Levelt, P.F. (author), Dirks, B.P.F. (author), Toet, P.M. (author), van der Wal, L.F. (author), Jansen, R. (author)In recent years TNO has investigated and developed different innovative opto-mechanical designs to realize advanced spectrometers for space applications in a more compact and cost-effective manner. This offers multiple advantages: a compact instrument can be flown on a much smaller platform or as add-on on a larger platform; a low-cost...conference paper 2017
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Nijenhuis, J.R. (author), Braam, B.C. (author), Hamelinck, R.F.M.M. (author)The mirror segments for the E-ELT and TLT are nearly equal in size and shape (hexagonal, 1.2 m over flat sides). They are very thin (about 50 mm) compared to their size. Supporting these mirrors and obtaining high optical performance is a challenge from design and manufacturing point of view. TNO has designed and build (together with VDL-ETG)...conference paper 2016
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Nijenhuis, J.R. (author), Heijmans, J.A.C. (author), de Breeje, R. (author), Hazelebach, R.L.M. (author), de Vreugd, J. (author), Crowcombe, W.E. (author), Naron, D.J. (author), Fritz, E.C. (author), Borghi, G. (author), Navarro, R. (author), Sillari, L. (author), Sambenedetto, E. (author), Eder, J. (author), Kamphues, F.G. (author)Described is the M1 segment support, as designed by TNO in the period 2015- 2016. The design has significantly changed and improved compared to the earlier designs. During the period 2009-2010 prototypes for the primary mirror support of the E-ELT have been developed. These have been extensively tested by ESO. Design improvement were found to be...conference paper 2016
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Gielesen, W.L.M. (author), de Bruijn, D. (author), van den Dool, T.C. (author), Kamphues, F.G. (author), Mekking, J. (author), Calvel, B. (author), Laborie, A. (author), Coatantiec, C. (author), Touzeau, S. (author), Erdmann, M. (author), Gare, P. (author), Monteiro, D. (author)The Gaia mission will create an extraordinarily precise three-dimensional map of more than one billion stars in our Galaxy. The Gaia spacecraft2, built by EADS Astrium, is part of ESA's Cosmic Vision programme and scheduled for launch in 2013. Gaia measures the position, distance and motion of stars with an accuracy of 24 micro-arcsec using two...conference paper 2013
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- Westerveld, W.J. (author), Pozo Torres, J.M. (author), Urbach, H.P. (author), Yousefi, M. (author) conference paper 2012
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Gielesen, W.L.M. (author), de Bruijn, D. (author), van den Dool, T.C. (author), Kamphues, F.G. (author), Meijer, E.A. (author), Calvel, B. (author), Laborie, A. (author), Monteiro, D. (author), Coatantiec, C. (author), Touzeau, S. (author), Erdmann, M. (author), Gare, P. (author)The Gaia mission1 will create an extraordinarily precise three-dimensional map of more than one billion stars in our Galaxy. The Gaia spacecraft2, built by EADS Astrium, is part of ESA's Cosmic Vision programme and scheduled for launch in 2013. Gaia measures the position, distance and motion of stars with an accuracy of 24 micro-arcsec using two...conference paper 2012
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Nijenhuis, J.R (author), Hamelinck, R.F.M.M. (author), Braam, B.C. (author)The mirror segments for the E-ELT and TLT are nearly equal in size and shape (hexagonal, 1.2 m over flat sides). They are very thin (about 50 mm) compared to their size. Supporting these mirrors and obtaining high optical performance is a challenge from design and manufacturing point of view. TNO has designed and build (together with VDL-ETG)...conference paper 2012
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Klinkhamer, J.F.F. (author), Moddemeijer, K. (author)For the optical system of the core CXRS port plug several designs were developed in the last years. A survey is given of the three most relevant designs. The first design is based on an off-axis ellipsoid mirror as main imaging component. This design has been the basis of opto-mechanical design as described in previous publications [1]. This...article 2011
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Nijenhuis, J.R. (author), Hamelinck, R.F.M.M. (author)ESO is preparing to build the E-ELT which will be the largest optical telescope in the world. Its primary mirror will be Ø39.3 m and will consist of nearly 1000 hexagonal segments of 1.2 meter width. Each segment is to be supported by the same structure although the segments vary in size and shape, hence this will cause variable surface...conference paper 2011
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Doornink, J. (author), de Goeij, B.T.G. (author), Marinescu, O. (author), Meijer, E. (author), Vink, H.J.P. (author), van Werkhoven, W.P. (author), van 't Hof, C.A. (author), TNO Industrie en Techniek (author)The EarthCARE satellite mission objective is the observation of clouds and aerosols from low Earth orbit. The payload will include active remote sensing instruments being the W-band Cloud Profiling Radar (CPR) and the ATLID LIDAR. These are supported by the passive instruments Broadband Radiometer (BBR) and the Multispectral Imager (MSI)...conference paper 2010
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Nijkerk, M.D. (author), van der Togt-Marinescu, O.E. (author), Gubbels, G.P.H. (author)A freeform optical surface is typically defined as any surface that does not have an axis of rotational symmetry. These surfaces provide additional degrees of freedom that can lead to improved performance compared to systems that make use solely of conventional optics. The benefits of using freeforms are: • Less optics can be used in the opto...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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TNO Industrie en Techniek (author), Vosteen, L.L.A. (author), Draaisma, F. (author), Werkhoven, W.P. (author), Riel, L.J.M. (author), Mol, M.H. (author), Den, O.G. (author)TNO developed a Wave Front Sensor (WFS) instrument for the GAIA mission. This Wave Front Sensor will be used to monitor the wave front errors of the two main telescopes mounted on the GAIA satellite, which may be corrected by a 5- degree of freedom (DOF) mechanism during operation. The GAIA-WFS will operate over a broad wavelength (450 to 900 nm...conference paper 2009
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TNO Industrie en Techniek (author), Meijer, E.A. (author), Nijenhuis, J.N. (author), Vink, R.J.P. (author), Kamphues, F.G. (author), Gielesen, W.L.M. (author), Coatantiec, C. (author)To measure the relative motions of GAIA's telescopes, the angle between the telescopes is monitored by an all Silicon Carbide Basic Angle Monitoring subsystem (BAM OMA). TNO is developing this metrology system. The stability requirements for this metrology system go into the pico meter and pico radian range. Such accuracies require extreme...conference paper 2009
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Heijmans, J.A.C. (author), Cheng, L.K. (author), Wieringa, F.P. (author)The advantages of optical fibers as medical sensors are recognized world wide nowadays. Insensitivity to electromagnetic disturbances and relative small dimensions are the most well known properties. The advantages of fiber optic sensors are especially valuable within environments with high temperatures, aggressive or explosive chemicals, strong...conference paper 2008
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