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Silvestri, F. (author), Feenstra, L.W. (author), Pettazzi, F. (author), Nijenhuis, J.R. (author), de Vreugd, J. (author), de Bruijn, D. (author), den Breeje, R. (author), Klop, W.A. (author), Ferrario, I. (author)High throughput optical satellite communication (SATCOM) systems need to rely on effective and robust technology to enable wavelength-division multiplexing (WDM) in a commercially viable way. The main challenge to implement WDM in optical feeder links deals with the multiplexing of high power channels. Currently the levels of power required for...conference paper 2022
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Kuiper, S. (author), Bos, A. (author), de Vreugd, J. (author), Witvoet, G. (author), Dekker, A. (author), Kamphues, F.G. (author), Slegtenhorst, G.F. (author), Jonker, W.A. (author), Maniscalco, M.P. (author), Femenía-Castella, B. (author), Núñez Cagigal, M. (author), Bienes Pérez, J. (author), Cózar-Castellano, J. (author), González-Cava, J.M. (author), Mato, A. (author), Soler Trujillo, A.M. (author), Vega Reyes, N. (author)This paper describes the preliminary design of the Adaptive Secondary Mirror (ASM) for the European Solar Telescope (EST), as designed by TNO. This ASM will contain 1950 actuators over an optical aperture of Ø80cm. The mirror-shell of this ASM is concave with a radius of 2.156m and has a thickness of 2.5mm. To cope with the high optical heat...conference paper 2022
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Köhler, J. (author), Jansen, R. (author), Irizar, J. (author), Sohmer, A. (author), Melf, M. (author), Greinacher, R. (author), Erdmann, M. (author), Kirschner, V. (author), Pérez Albiñana, A. (author), Martin, D. (author), de Goeij, B.T.G. (author), Vink, H.J.P. (author), Day, J.P.R. (author), ten Bloemendal, D. (author), Gielesen, W.L.M. (author), de Vreugd, J. (author), van der Laan, L.W. (author), van 't Hof, C.A. (author)Sentinel-5 is an Earth atmospheric monitoring mission developed within the European Union’s Copernicus program. The mission objective is to monitor the composition of the Earth’s atmosphere on a daily basis. Airbus DS GmbH acts as the prime contractor under a European Space Agency contract. The instrument design, development, and the instrument...conference paper 2021
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van Baars, G.E. (author), Florijn, H.C.B. (author), Peters, J. (author), de Vreugd, J. (author), van Kempen, F.C.M. (author), van den Boom, S.J. (author), van de Ven, E.A. (author), Jonker, W.A. (author), Lubbers, L.A. (author)Metamaterials is a rapidly developing field of research. It offers the prospect of material properties that do not exist in regular materials and which might be useful for overcoming hurdles in current mechatronic system design. Stimulated by the progress in additive manufacturing (AM) that has enabled fabrication of materials with complex...article 2020
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Jansen, R. (author), Day, J.P.R. (author), Vink, H.J.P. (author), de Vreugd, J. (author), van Beekum, E.R.J. (author), van der Laan, L.W. (author), van 't Hof, A.C.A. (author), Gielesen, W.L.M. (author), Koehler, J. (author)Sentinel-5 is an Earth atmospheric monitoring mission developed within the Copernicus program. The mission objective is to monitor the composition of the Earth's atmosphere on a daily basis. TNO is developing the UV1 spectrometer subsystem as well as the two telescope subsystems. In this paper, the design of the UV1 spectrometer is described and...conference paper 2019
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van der Kolk, M. (author), van der Veen, G.J. (author), de Vreugd, J. (author), Langelaar, M. (author)The design of high performance instruments often involves the attenuation of poorly damped resonant modes. Current design practices typically rely on informed trial and error based modifications to improve dynamic performance. In this article, a multi-material topology optimization approach is presented as a systematic methodology to develop...article 2017
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Eijk, A. (author), de Lange, T.J. (author), de Vreugd, J. (author), Slis, E.J.P. (author)Reciprocating compressors generate vibrations caused by pulsation-induced forces, mechanical (unbalanced) free forces and moments, crosshead guide forces and cylinder stretch forces. The traditional way of mitigating the vibration and cyclic stress levels to avoid fatigue failure of parts of the reciprocating compressor system (piping,...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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Buis, E.J. (author), Doppenberg, E.J.J. (author), Lahmann, R. (author), Toet, P.M. (author), de Vreugd, J. (author)Cosmic neutrinos with ultra high energies can be detected acoustically using hydrophones. The detection of these neutrinos may provide crucial information about then GZK mechanism. The flux of these neutrinos, however, is expected to be low, so that a detection volume is required more than a order of magnitude larger than what has presently been...conference paper 2016
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Buis, E.J. (author), Doppenberg, E.J.J. (author), Lahmann, R. (author), Toet, P.M. (author), de Vreugd, J. (author)Optical fiber hydrophones provide a promising technology for a future neutrino telescope that enables the acoustic detection of ultra-high energy neutrinos in the deep sea. These cosmic neutrinos leave a small acoustic signal that could be detected when the sensitivity of the technology is sufficiently high. In this study we have investigated in...conference paper 2015
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van Baars, G. (author), Smeltink, J. (author), van der Werff, J. (author), Limpens, M. (author), Barink, M. (author), van den Berg, D. (author), de Vreugd, J. (author), Witvoet, G. (author), Galaktionov, O.S. (author)This article presents developments of freeform mechatronics concepts, enabled by industrial Additive Manufacturing (AM), aiming at breakthroughs for precision engineering challenges such as lightweight, advanced thermal control, and integrated design. To assess potential impact in future applications, representative cases have been considered....conference paper 2015
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Bijster, R.J.F. (author), de Vreugd, J. (author), Sadeghian Marnani, H. (author)In photo-thermal actuation, heat is added locally to a micro-cantilever by means of a laser. A fraction of the irradiation is absorbed, yielding thermal stresses and deformations in the structure. Harmonic modulation of the laser power causes the cantilever to oscillate. Moreover, a phase lag is introduced which is very sensitive to the spot...article 2014
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Cheng, L.K. (author), Toet, P.M. (author), de Vreugd, J. (author), Nieuwland, R.A. (author), Tseb, M.L.V. (author), Tamb, H. (author)During the last decades, the use of optical fiber for sensing applications has gained increasing acceptance because of its unique properties of being intrinsically safe, unsusceptible to EMI, potentially lightweight and having a large operational temperature range. Among the different Fiber Optic sensor types, Fiber Bragg Grating (FBG) is most...conference paper 2014
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Bijster, R.J.F. (author), de Vreugd, J. (author), Sadeghian Marnani, H. (author)In this paper, an experimental-theoretical method is proposed to accurately determine the thermal diffusivity, characteristic time constant and layer thicknesses of a bimaterial cantilever using a transient, non-destructive and noncontact measurement. The technique is based on the wellknown optical beam deflection method. A time dependent,...conference paper 2013
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Bijster, R.J.F. (author), de Vreugd, J. (author), Sadeghian Marnani, H. (author)The optical beam deflection (OBD) technique is used in many Atomic Force Microscopes to measure the motion of a cantilever as it probes the scanned surface. From the measured rotation, surface and sub-surface properties of the sample can be deduced. To maximize the sensitivity of the measurement, the combination of laser and cantilever should be...conference paper 2013
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Pijnenburg, J.A.C.M. (author), te Voert, M.J.A. (author), de Vreugd, J. (author), Vosteen, L.L.A. (author), van Werkhoven, W.P. (author), Mekking, J. (author), Nijland, B.A.H. (author)Through the years many stable optical mounts have been designed, analyzed and tested at TNO. This paper gives an overview of the design principles used. Various examples are presented together with verification test results. The use of adhesives in combination with an iso-static mount design allows mounting of optical components in a limited...public lecture 2012
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Pijnenburg, J.A.C.M. (author), te Voert, M.J.A. (author), de Vreugd, J. (author), Vosteen, L.L.A. (author), van Werkhoven, W.P. (author), Mekking, J. (author), Nijland, B.A.H. (author)Through the years many stable optical mounts have been designed, analyzed and tested at TNO. This paper gives an overview of the design principles used. Various examples are presented together with verification test results. The use of adhesives in combination with an iso-static mount design allows mounting of optical components in a limited...conference paper 2012
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de Vreugd, J. (author), te Voert, M.J.A. (author), Nijenhuis, J.R. (author), Pijnenburg, J.A.C.M. (author), Tabak, E. (author)Adhesives are widely used in optomechanical structures for bonding optical components to their mounts. The main advantage of using adhesives is the excellent strength to weight ratio. Adhesive bonding is seen as a desirable joining technique as it allows for greater flexibility in design. A disadvantage of adhesives however is the limited...conference paper 2012
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Yuan, C.A. (author), Weltevreden, E.R. (author), van den Akker, P. (author), Kregting, R. (author), de Vreugd, J. (author), Zhang, G.Q. (author)Copper based wire bonding technology is widely accepted by electronic packaging industry due to the world-wide cost reduction actions (compared to gold wire bond). However, the mechanical characterization of copper wire differs from the gold wire; hence the new wire bond process setting and new bond pad structure is required. It also refers to...conference paper 2011
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Gromala, P. (author), Duerr, J. (author), Dressler, M. (author), Jansen, K.M.B. (author), Hawryluk, M. (author), de Vreugd, J. (author)Numerical simulation plays an important role in product design. Its accuracy relays on a detailed description of geometry, material models, load and boundary conditions. This paper focuses on a new approach of FEM material modeling of three commercially available molding compounds. Curing shrinkage, modulus of elasticity and coefficient of...conference paper 2011