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Iyer, V. (author), Enthoven, C.A. (author), van Dommelen, P. (author), van Samkar, A. (author), Groenewoud, J.H. (author), Jaddoe, V.V.W. (author), Reijneveld, S.A. (author), Klaver, C.C.W. (author)Background. Refractive errors are relatively common all around the world. In particular, early onset myopia is associated with a significant burden in later life. Little is known about refractive errors in preschool children. The aim of this study was to assess the prevalence of spectacle wear, visual acuity and refractive errors in young Dutch...article 2022
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Rates of spectacle wear in early childhood: are preventive measures for refractive errors indicated?Iyer, V. (author), Enthoven, C.A. (author), van Dommelen, P. (author), van Samkar, A. (author), Groenewoud, J.H. (author), Jaddoe, V.V.W. (author), Reijneveld, S.A. (author), Klaver, C. (author)Aims Refractive errors are relatively common all around the world. In particular, early onset myopia is associated with a significant burden in later life. Little is known about refractive errors in preschool children. The aim of this study was to assess the prevalence of spectacle wear, visual acuity and refractive errors in young Dutch...conference paper 2022
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Yamaguchi, S. (author), van Aken, B.B. (author), Stodolny, M.K. (author), Loffler, J. (author), Masuda, A. (author), Ohdaira, K. (author)System voltages can cause significant degradation in photovoltaic modules. Polarization-type potential-induced degradation (PID) is accompanied by decreases in the short-circuit current density and the open-circuit voltage. The system voltage causes a polarization and surface charge accumulation, increasing the interface recombination. The...article 2021
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Koldeweij, R.B.J. (author), Kant, P. (author), Harth, K. (author), de Ruiter, R. (author), Gelderblom, H. (author), Snoeijer, J.H. (author), Lohse, D. (author), van Limbeek, M.A.J. (author)When a droplet is brought in contact with an undercooled surface, it wets the substrate and solidifies at the same time. The interplay between the phase transition effects and the contact-line motion, leading to its arrest, remains poorly understood. Here we reveal the early solidification patterns and dynamics of spreading hexadecane droplets....article 2021
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- Sprung, D. (author), Sucher, E. (author), Grossmann, P. (author), Kociok, T. (author), van Eijk, A.M.J. (author), Stein, K. (author) conference paper 2019
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Sucher, E. (author), Sprung, D. (author), Kremer, M. (author), Kociok, T. (author), Van Eijk, A.M.J. (author), Stein, K. (author)Wave propagation of electro-optical systems, lasers or imaging depends on the state of the atmosphere their beams are passing through. Fluctuations in the refractive index of air are responsible for signal attenuation and image degradation. This atmospheric effect is called optical turbulence and its strength is quantified by the structure...conference paper 2018
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Sprung, D. (author), Sucher, E. (author), van Eijk, A.M.J. (author), Eisele, C. (author), Seiffer, D. (author), Stein, K. (author)A field trial was performed in the arid scrub area of White Sands, NM /USA in October 2017 investigating the atmospheric influence on imaging and sensor performance. In this paper we focus on the strength of optical turbulence. Optical turbulence is described by the structure function parameter of the refractive index Cn 2. It is responsible for...conference paper 2018
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van Gulik, R.J.J. (author), de Boer, B.M. (author), Harmsma, P.J. (author)In this paper, we compare ring resonator and three-port Mach-Zehnder Interferometer (MZI) devices fabricated on silicon-on-insulator for the purpose of refractive index sensing. Their respective sensitivities and limits of detection (LOD) were determined with NaCl solutions. A sensitivity of 113.07 nm per refractive index unit (RIU) and LOD of 2...article 2017
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Faber, A.J. (author), Cheng, L.K. (author), Gielesen, W.L.M. (author), Boussard-Plédel, C. (author), Houizot, P. (author), Danto, S. (author), Lucas, J. (author), Pereira Do Carmo, J. (author)The development of single mode chalcogenide glass fibers as wavefront filter for the DARWIN mission is reported. Melting procedures and different preform techniques for manufacturing core-cladding chalcogenide fibers are described. Bulk glass samples on the basis of Te-As-Se- and high Te-compositions have been characterized optically, by...conference paper 2017
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Eisele, C. (author), Seiffer, D.P. (author), Stein, K. (author), Sucher, E. (author), Gunter, W.H. (author), February, F. (author), Vrahimis, G. (author), Wainman, C. (author), Maritz, B. (author), Koago, M.S. (author), van Eijk, A.M.J. (author), van Iersel, M. (author), Cohen, L.H. (author), van Binsbergen, S.A. (author), Heemskerk, H.J.M.E. (author), Sternberg, A. (author), Schulte, H. (author), van Rheenen, A.D. (author), Brenthagen, E. (author), Thomassen, J.B. (author), Griffith, D. (author)A long term field trial called FESTER (First European South African Transmission Experiment) has been conducted by an international collaboration of research organizations during the course of almost one year at False Bay, South Africa. Main objectives of the experiment are a better insight into atmospherical effects on propagation of optical...conference paper 2016
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Maritz, B. (author), Koago, M.S. (author), Wainman, C.K. (author), Gardener, M.E. (author), Gunter, W.H. (author), van Eijk, A.M.J. (author)The First European South African Experiment (FESTER) was conducted over about a 10 month period at the Institute of Maritime Technology (IMT) in False Bay, South Africa. One of the important goals was to validate atmospheric refraction and turbulence models. To achieve this goal it was required to measure the vertical profile of meteorological...conference paper 2016
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Gunter, W.H. (author), Maritz, B. (author), Koago, M. (author), Wainman, C.K. (author), Gardener, M.E. (author), February, F. (author), van Eijk, A.M.J. (author)The First European South African Experiment (FESTER) was conducted over about a 10 month period at the Institute of Maritime Technology (IMT) in False Bay, South Africa. One of the important goals was the establishment of the air-sea temperature difference (ASTD) homogeneity along the main propagation link atmospheric path since it is a basic...conference paper 2016
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ElAnzeery, H. (author), El Daif, O. (author), Buffière, M. (author), Oueslati, S. (author), Ben Messaoud, K. (author), Agten, D. (author), Brammertz, G. (author), Guindi, R. (author), Kniknie, B. (author), Meuris, M. (author), Poortmans, J. (author)Cu2nSnSe4 (CZTSe) thin film solar cells are promising emergent photovoltaic technologies based on low-bandgap absorber layer with high absorption coefficient. To reduce optical losses in such devices and thus improve their efficiency, numerical simulations of CZTSe solar cells optical characteristics can be performed based on individual optical...article 2015
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Boersma, A. (author), van Ee, R.J. (author), Stevens, R.S.A. (author), Saalmink, M. (author), Charlton, M.D.B. (author), Pollard, M.E. (author), Chen, R. (author), Kontturi, V. (author), Karioja, P. (author), Alajoki, T. (author)This paper describes experimental measurement results for photonic crystal sensor devices which have been functionalized for gas sensing applications. The sensor consists of a two dimensional photonic crystal etched into a slab waveguide having a refractive index of 1.7-1.9. Test devices were fabricated from SiON material on silicon/ silicon...conference paper 2014
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van Eekeren, A.W.M. (author), Dijk, J. (author), Schutte, K. (author)In general, long range detection, recognition and identification in visual and infrared imagery are hampered by turbulence caused by atmospheric conditions. The amount of turbulence is often indicated by the refractive-index structure parameter Cn 2. The value of this parameter and its variation is determined by the turbulence effects over the...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
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Iyer, V. (author), van Samkar, A. (author), Saeed, P. (author)Background and Purpose: In the Netherlands, children are screened for amblyopia based on the early detection of visual disorders (VOV) protocol by child health care physicians. The positive predictive value (PPV) of the Brückner test variant (BTV) as an alternative method was assessed. Patients and Methods: In this historical prospective...article 2013
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de Jong, A.N. (author), Schwering, P.B.W. (author), van Eijk, A.M.J. (author), Gunter, W.H. (author)Various atmospheric propagation effects are limiting the long range performance of electro-optical imaging systems. These effects include absorption and scattering by molecules and aerosols, refraction due to vertical temperature gradients and scintillation and blurring due to turbulence. In maritime and coastal areas, ranges up to 25 km are...article 2013
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Dol, H.S. (author), Ainslie, M.A. (author), Colin, M.E.G.D. (author), Janmaat, J. (author)Sea surface scattering by wind-generated waves and bubbles is regarded to be the main nonplatform-related cause of the time variability of shallow acoustic communication channels. Simulations for predicting the quality of acoustic communication links in such channels thus require adequate modelling of these dynamic sea-surface effects. It is...conference paper 2012
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- Buis, E.J. (author), Berkhout, G.C.G. (author), Love, G.D. (author), Kirby, A.K. (author), Taylor, J.M. (author), Hannemann, S. (author), Collon, M.J. (author) article 2012