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Bos, A. (author), Henselmans, R. (author), Rosielle, P.C.J.N. (author), Steinbuch, M. (author)To enable important scientific discoveries, ESO has defined a new ground-based telescope: the European Extremely Large Telescope (E-ELT). The baseline design features a telescope with a 39-m-class primary mirror (M1), making it the largest and most powerful telescope in the world. The M1 consists of 798 hexagonal segments, each about 1.4 m wide,...article 2015
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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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Henselmans, R. (author), Cacace, L.A. (author), Kramer, G.F.Y. (author), Rosielle, P.C.J.N. (author), Steinbuch, M. (author)Aspherical and freeform optics are applied to reduce geometrical aberrations as well as to reduce the required number of components, the size and the weight of the system. To measure these optical components with nanometre level uncertainty is a challenge. The NANOMEFOS machine was developed to provide suitable metrology (high accuracy,...article 2011
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Henselmans, R. (author), Cacace, L.A. (author), Kramer, G.F.I. (author), Rosielle, P.C.J.N. (author), Steinbuch, M. (author), TNO Industrie en Techniek (author)This paper shows the machine concept, the realization and the test results of the completed NANOMEFOS non-contact measurement machine for freeform optics. The separate short metrology loop results in a stability at standstill of 0.9 nm rms over 0.1 s. Measurements of a tilted flat show a repeatability of 2-4 nm rms, depending on the applied tilt...conference paper 2009
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Ravensbergen, S.K. (author), Hamelinck, R.F.H.M. (author), Rosielle, P.C.J.N. (author), Steinbuch, M. (author), TNO Industrie en techniek (author)Adaptive Optics is established as essential technology in current and future ground based (extremely) large telescopes to compensate for atmospheric turbulence. Deformable mirrors for astronomic purposes have a high number of actuators (> 10k), a relatively large stroke (> 10µm) on a small spacing (< 10mm) and a high control bandwidth (> 100Hz)....conference paper 2009
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TNO Industrie en Techniek (author), Henselmans, R. (author), Cacace, L. (author), Ramer, G. (author), Rosielle, P.C.J.N. (author), Steinbuch, M. (author)Applying aspherical and freeform optics in high-end optical systems can improve system performance while decreasing the system mass, size and number of required components. The NANOMEFOS measurement machine is capable of universal non-contact and fast measurement of aspherical and freeform optics up to Ø500 mm, with an uncertainty of 30 nm (2σ)....conference paper 2009
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Hamelinck, R.F.M.M. (author), Rosielle, P.C.J.N. (author), Steinbuch, M. (author), Ellenbroek, R.M.L. (author), Verhaegen, M. (author), Doelman, N.J. (author)Light traveling from a star suffers from optical distortion caused by the earth’s atmosphere. Adaptive optics (AO) is used in ground-based telescopes to correct these distortions (figure 1). In an AO system a real-time control system drives a deformable mirror based on information from the wavefront sensor.conference paper 2008
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TNO Industrie en Techniek (author), Hamelinck, R.F.M.M. (author), Ellenbroek, R.M.L. (author), Rosielle, P.C.J.N. (author), Steinbuch, M. (author), Verhaegen, M. (author), Doelman, N.J. (author)A new prototype adaptive deformable mirror for future AO-systems is presented that consists of a thin continuous membrane on which push-pull actuators impose out-of-plane displacements. Each actuator has ±10um stroke, nanometer resolution and only mW's heat dissipation. The mirror's modular design makes the mechanics, electronics and control...conference paper 2008
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Design, realization and testing of the nanomefos non-contact measurement machine for freeform opticsTNO Industrie en Techniek (author), Henselmans, R. (author), Cacace, L. (author), Rosielle, P.C.J.N. (author), Steinbuch, M. (author)By applying freeform optics (figure 1) in high-end optical systems such as used in space, science and lithography applications, system performance can be improved while decreasing the system mass, size and number of required components (for instance [1]). The applicability of classical metrology methods is limited for freeform surfaces, which is...conference paper 2008
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Hamelinck, R.F.M.M. (author), Rosielle, P.C.J.N. (author), Steinbuch, M. (author), Doelman, N.J. (author), Ellenbroek, R.M.L. (author), Verhaegen, M. (author)An adaptive deformable mirror (DM) with a distributed control system is being developed to correct both the temporal and spatial high frequent distortions and limit the power dissipation to a few mWs per actuator.conference paper 2007
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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), Hamelinck, R.F.M.M. (author), Rosielle, P.C.J.N. (author), Steinbuch, M. (author), Ellenbroek, R.M.L. (author), Verhaegen, M. (author), Doelman, N.J. (author)In the design of a large adaptive deformable membrane mirror, variable reluctance actuators are used. These consist of a closed magnetic circuit in which a strong permanent magnet provides a static magnetic force on a ferromagnetic core which is suspended in a membrane. By applying a current through the coil which is situated around the magnet,...conference paper 2006
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van Veggel, A.A. (author), Rosielle, P.C.J.N. (author), Nijmeijer, H. (author), Wielders, A.A. (author), Vink, H.J.P. (author), TNO Industrie en Techniek (author)Due to the 10 microarcsecond accuracy, with which Gaia will measure the positions of stars using 2 astrometric telescopes, stability requirements on the payload module are extremely stringent. In order to achieve the required 10 microarcsecond accuracy, a metrology system could be installed on the satellite to monitor variations on the basic...conference paper 2005
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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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TNO Industrie en Techniek (author), Henselmans, R. (author), Rosielle, P.C.J.N. (author), Steinbuch, M. (author), Saunders, I. (author), Bergmans, R. (author)A new universal non-contact measurement machine design for measuring free-form optics with 30 nm expanded uncertainty is presented. In the cylindrical machine concept, an optical probe with 5 mm range is positioned over the surface by a motion system. Due to a 2nd order error effect when measuring smoothly curved surfaces, only 6 position...conference paper 2005
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TNO Industrie en Techniek (author), Hamelinck, R.F.M.M. (author), Rosielle, P.C.J.N. (author), Steinbuch, M. (author), Doelman, N.J. (author)The first prototype of an actuator for a new adaptive deformable mirror (DM) is presented together with the development of a 61-actuator grid element. The DM design consists of a thin membrane which acts as the correcting element. A grid of low voltage electro-magnetic push-pull actuators, impose out-of-plane displacements in the mirror's...conference paper 2005
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TNO Industrie en Techniek (author), Hamelinck, R.F.M.M. (author), Rosielle, P.C.J.N. (author), Steinbuch, M. (author), Doelman, N.J. (author)A large adaptive deformable mirror with high actuator density is presented. The DM consists of a thin continuous membrane which acts as the correcting element. A grid of low voltage electro-magnetical push-pull actuators, - located in an actuator plate -, impose out-of-plane displacements in the mirror's membrane. To provide a stable and stiff...conference paper 2005
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TNO Industrie en Techniek (author), van Veggel, A.A. (author), Berkhout, W.J. (author), Schalkx, M.K. (author), Wielders, A.A. (author), Rosielle, P.C.J.N. (author), Nijmeijer, H. (author)The satellite GAIA will be launched in ca. 2010 to make a 3-D map of our Galaxy. The payload module of the satellite will carry two astrometric telescopes amongst other instrumentation. The optical bench and astrometric telescopes will be constructed for a large part in Silicon Carbide (SiC). A truss structure concept design was developed, which...conference paper 2005
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van Veggel, M. (author), Vink, R. (author), Rosielle, P.C.J.N. (author), Nijmeijer, H. (author), Wielders, A.A. (author)The GAIA satellite, scheduled for launch in 2010, will make a highly accurate map of our Galaxy. It will measure the position of stars with an accuracy of 50 prad using two telescopes, which are positioned under a 'basic' angle between the the lines-of-sight of the telescopes of 106°. With a Basic Angle Monitoring system, variations of this...conference paper 2004