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Jonker, W.A. (author), Kuiper, S. (author), Nijenhuis, J.R. (author), Dekker, A. (author), Bos, A. (author), van de Ven, E.A. (author), Chun, M. (author), Priem, H. (author), Breukers, M. (author)An adaptive secondary mirror (ASM) is currently being developed for the UH2.2 telescope, consisting of a slumped 620mm convex aspherical facesheet, manipulated by 210 variable-reluctance actuators and supported on a siliconaluminium alloy support structure. The total power dissipation of the actuators is expected to be under 3 Watts. The ASM...conference paper 2020
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Kuiper, S. (author), Doelman, N.J. (author), Human, J.D. (author), Saathof, R. (author), Klop, W.A. (author), Maniscalco, M.P. (author)TNO is developing Deformable Mirror (DM) technology, targeted for aberration correction in high-end Adaptive Optics (AO) applications in the field of lithography, astronomy, space and laser communication. The heart of this deformable mirror technology is a unique actuator technology based on the variable reluctance principle. The main advantages...conference paper 2018
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Witvoet, G. (author), Human, J.D. (author), Maniscalco, M.P. (author)An active tilt mirror mechanism, meant for correction of the constellation breathing of the evolved Laser Interferometer Space Antenna, has been designed and realized. Its open-loop performance has been characterized in both time and frequency domain. Based on this, a feedback controller has been designed and the resulting closed-loop...conference paper 2016
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Kuiper, S. (author), Doelman, N.J. (author), Nieuwkoop, E. (author), Overtoom, A.J. (author), Russchenberg, T. (author), van Riel, M.C.J.M. (author), Wildschut, J.A. (author), Baeten, M.J.J. (author), Human, J.D. (author), Spruit, W.E.T. (author), Brinkers, S. (author), Maniscalco, M.P. (author)Over the last decade TNO has developed a deformable mirror concept using electromagnetic actuators with the main advantages of having very low non-linearity and hysteresis, low power consumption, and high inherent reliability of the actuators. TNO recently started a program to redesign the electromagnetic actuator to improve the actuator...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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Agócs, T. (author), Navarro, R. (author), Venema, L. (author), van Amerongen, A.H. (author), Tol, P.J.J. (author), van Brug, H. (author), Brandl, B.R. (author), Molster, F. (author), Todd, S. (author)We present innovative, immersed grating based optical designs for the SMO (Spectrograph Main Optics) module of the Mid-infrared E-ELT Imager and Spectrograph, METIS. The immersed grating allows a significant reduction of SMO volume compared to conventional echelle grating designs, because the diffraction takes place in high refractive index...conference paper 2014