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Bowens-Rubin, R. (author), Bos, A. (author), Hinz, P. (author), Holden, B. (author), Radovan, M. (author)As we enter the era of TESS and JWST, instrumentation that can carry out radial velocity measurements of exoplanet systems is in high demand. We will address this demand by upgrading the UC Lick Observatory’s 2.4-meter Automated Planet Finder (APF) telescope with an adaptive optics (AO) system. The AO upgrade will be directly integrated into the...conference paper 2022
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Bowens-Rubin, R. (author), Dillon, D. (author), Hinz, P.M. (author), Kuiper, S. (author)Advancements in high-efficiency hybrid variable reluctance (HVR) actuators are an enabling technology for building the next generation of large-format deformable mirrors, including adaptive secondary mirrors. The Netherlands Organization for Applied Scientific Research (TNO) has developed a new style of hybrid variable reluctance actuator that...conference paper 2021
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Bekesi, E. (author), Fokker, P.A. (author), Martins, J.E. (author), Norini, G. (author), van Wees, J.-D. (author)We investigate ground movements induced by the 8 February 2016, Mw=4.2 earthquake at the Los Humeros Geothermal Field (Mexico) using Sentinel-1 radar interferometry. Previous estimated focal mechanism solution based on seismic data with a hypocentral depth of 1900 m could not resolve the measured coseismic surface deformation pattern. In this...article 2021
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Roulet, M. (author), Atkins, C. (author), Hugot, E. (author), Snell, R. (author), van de Vorst, B. (author), Morris, K. (author), Marcos, M. (author), Todd, I. (author), Miller, C. (author), Dufils, J. (author), Farkas, S. (author), Mezo, G. (author), Tenegi, F. (author), Vega-Moreno, A. (author), Schnelter, H. (author)In this paper we are exploring the possibilities of 3D printing in the fabrication of mirrors for astronomy. Taking the advantages of 3D printing to solve the existing problems caused by traditional manufacturing, two proof-of- concept mirror fabrication strategies are investigated in this paper. The first concept is a deformable mirror with...article 2020
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- Bowens-Rubin, R. (author), Hinz, P. (author), Jonker, W.A. (author), Kuiper, S. (author), Laguna, C. (author), Maniscalco, M. (author) conference paper 2020
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Hinz, P.M. (author), Bowens-Rubin, R. (author), Baranec, C. (author), Bundy, K. (author), Chun, M. (author), Dillon, D. (author), Holden, B. (author), Jonker, W.A. (author), Kosiarek, M. (author), Kupke, R. (author), Kuiper, S. (author), Lai, O. (author), Lu, J.R. (author), Maniscalco, M. (author), Radovan, M. (author), Ragland, S. (author), Sallum, S. (author), Skemer, A. (author), Wizinowich, P. (author)An Adaptive secondary mirror (ASM) allows for the integration of adaptive optics (AO) into the telescope itself. Adaptive secondary mirrors, based on hybrid variable reluctance (HVR) actuator technology, developed by TNO, provide a promising path to telescope-integrated AO. HVR actuators have the advantage of allowing mirrors that are sti↵er,...conference paper 2020
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Li Piani, T. (author), Weerheijm, J. (author), Moriniere, G. (author), Hoogland, J. (author), Schipperen, J.H.A. (author), Roebroeks, G.H.J.J. (author), Alderliesten, R. (author)Landmines are used in battle fields to damage military vehicles. Current vehicle applications in Out of area operations (OoA) are mainly based on steel and aluminum. These offer protection at the expenses of high weight, mobility limitations and design restrictions. A prototype of composite panel which outperforms the blast response of...article 2020
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Kuiper, S. (author), Saathof, R. (author)TNO’s DM technology is based on a unique electromagnetic actuator. TNO is targeting the DM development for applications for atmospheric corrections in both astronomy and laser communication applications.other 2019
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Saathof, R. (author), Kuiper, S. (author), Crowcombe, W.E. (author), de Man, H. (author), de Lange, T.J. (author), van der Valk, N.C.J. (author), Kramer, L. (author), Fritz, E.C. (author)Optical communications will complement radio frequency (RF) communications in the coming decades to enhance throughput, power efficiency and link security of satellite communication links. To enable optical communications technology for intersatellite links and (bi-directional) ground to satellite links, TNO develops a suite of technologies in...conference paper 2019
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Kuiper, S. (author), Jonker, W.A. (author), Maniscalco, M.P. (author), Priem, H. (author), Coolen, C. (author), Chun, M. (author), Baranec, C. (author), Lu, J. (author), Lai, O. (author)TNO and industrial partners VDL ETG, L3Harris and Hyperion are developing a novel Adaptive Secondary Mirror (ASM) for Ground Layer Adaptive Optics (GLAO) at the University of Hawaii’s 88-inch telescope on Mauna Kea. The ASM is based on a unique actuator principle which delivers a >30µm PV 99% linear stroke at a very high efficiency in terms of...conference paper 2019
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Smelik, R.M. (author), van Wermeskerken, F.P.J. (author), Krijnen, R. (author), Kuijper, F. (author)The real environment in which military operations take place is dynamic and ever changing under the influence of natural effects and human activities. In contrast, synthetic representations of these environments used in simulations typically have had little support for dynamic effects and run-time changes. Advances in computer graphics research...article 2019
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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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Bijleveld, F.W. (author), Hoogeland, M.G. (author), Walters, C.L. (author), van Bergen, J.W. (author)Ship owners, including navies, are increasingly sailing ice-infested waters and hence need to know the safety of ship hulls regarding collision with ice. Considerable knowledge exists for modelling failure of the hull in impact situations; however, these methods are either insufficiently precise or too expensive for engineering practice. A...conference paper 2018
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Ruiz-Constán, A. (author), Ruiz-Armenteros, A.M. (author), Martos-Rosillo, S. (author), Galindo-Zaldívar, J. (author), Lazecky, M. (author), García, M. (author), Sousa, J.J. (author), Sanz de Galdeano, C. (author), Delgado-Blasco, J.M. (author), Jiménez-Gavilán, P. (author), Caro-Cuenca, M. (author), Luque-Espinar, J.A. (author)This research underlines the need to improve water management policies for areas linked to confined karstic aquifers subjected to intensive exploitation, and to develop additional efforts towards monitoring their subsidence evolution. We analyze subsidence related to intensive use of groundwater in a confined karstic aquifer, through the use of...article 2018
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Voogt, B. (author), Huinink, H. (author), Erich, S.J.F. (author), Scheerder, J. (author), Venema, P. (author), Adan, O.C.G. (author)GARField 1H NMR relaxometry experiments were done to study the drying process of two latices with different polymer Tg and to elucidate water mobility behavior during this process. It was found that the hard type latex, with a polymer Tg above room temperature, dries faster than the soft type latex, with a polymer Tg below room temperature....article 2018
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Saathof, R. (author), den Breeje, R. (author), Klop, W.A. (author), Kuiper, S. (author), Doelman, N.J. (author), Pettazzi, F. (author), Vosteen, L.L.A. (author), Wildschut, J.A. (author), de Lange, T.J. (author), Moens, T.M.N. (author), Koster, S.E. (author), Gruber, J.M. (author), Spierdijk, J.P.F. (author), Kerkhof, P.J. (author), Russchenberg, T. (author), Truyens, D.C. (author), Crowcombe, W.E. (author), Human, J.D. (author), Mata Calvo, R. (author), Poliak, J. (author), Barrios, R. (author), Scalise, S. (author), Ferrario, I. (author)TNO and DLR envision optical free-space communication between ground stations and geostationary telecommunication satellites to replace the traditional RF links for the next generation of Very High Throughput Satellites. To mitigate atmospheric turbulence, an Adaptive Optics (AO) system will be used. TNO and DLR are developing breadboards to...conference paper 2018
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Ruiz-Armenteros, A.M. (author), Lazecky, M. (author), Ruiz-Constan, A. (author), Bakon, M. (author), Delgado, J. Manuel (author), Sousa, J.J. (author), Galindo-Zaldivar, J. (author), de Galdeano, C.S. (author), Caro-Cuenca, M. (author), Martos-Rosillo, S. (author), Jimenez-Gavilan, P. (author), Perissin, D. (author)In this paper we analyze the subsidence behavior of a coastal area in the province of Malaga (Costa del Sol), southern Spain, in the period 1992-2018 using C-band SAR interferometry. The area comprises several zones of interest where continuous deformation has happened during the analyzed period. Using SAR data from ESA's ERS-1/2, Envisat, and...conference paper 2018
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Ruiz-Armenteros, A.M. (author), Lazecky, M. (author), Hlavacova, I. (author), BakoAaˆ, M. (author), manuel Delgado, J. (author), Sousa, J.J. (author), Lamas-Fernandez, F. (author), Marchamalo, M. (author), Caro-Cuenca, M. (author), Papco, J. (author), Perissin, D. (author)Dams require continuous security and monitoring programs, integrated with visual inspection and testing in dam surveillance programs. New approaches for dam monitoring focus on multi-sensor integration, taking into account emerging technologies such as GNSS, optic fiber, TLS, InSAR techniques, GBInSAR, GPR, that can be used as complementary data...conference paper 2018
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Smelik, R.M. (author), van Wermeskerken, F.P.J. (author), Krijnen, R. (author), Kuijper, F. (author)The real environment in which military operations take place is dynamic and ever changing under the influence of natural effects and human activities. In contrast, synthetic representations of these environments used in simulations typically have had little support for dynamic effects and run-time changes. Advances in computer graphics research...article 2018
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Fan, J.T. (author), Weerheijm, J. (author), Sluys, L.J. (author)The deformation-to-fracture evolution of aflexible polymer material under high-strain-rate compressive loadingconducted by a split Hopkinson pressure bar (SHPB) setup was investigated. Representative tests were carriedout at different strain rate levels, followed by the characterization of dynamic damage after each test. Craze andcrack patterns...article 2018