- document
-
Akkerman, H. (author), Peeters, B. (author), van Breemen, A. (author), Shanmugam, S. (author), Ugalde Lopez, L. (author), Tordera, D. (author), van de Ketterij, R. (author), Delvitto, E. (author), Malinowski, P. (author), Ke, T.-H. (author), De Roose, F. (author), Moreno Hagelsieb, L. (author), Katsouras, I. (author), Kronemeijer, A.J. (author), Meulenkamp, E. (author), Gelinck, G. (author)In recent years there is an increasing interest to integrate optical sensing in mobile displays, for instance, for biometric fingerprint scanning functionality. There are several routes to incorporate optical fingerprint functionality within the full display area, each with their own benefits and challenges. Here we investigate the different...conference paper 2021
- document
- Sciacca, B. (author), Boersma, A. (author) conference paper 2018
- document
-
Müller, W. (author), Kuwertz, A. (author), Grönwall, C. (author), Petersson, H. (author), Dekker, R. (author), Reinert, F. (author), Ditzel, M. (author)Experiences from recent conflicts show the strong need for smart sensor suites comprising different multi-spectral imaging sensors as core elements as well as additional non-imaging sensors. Smart sensor suites should be part of a smart sensor network - A network of sensors, databases, evaluation stations and user terminals. Its goal is to...conference paper 2017
- document
-
Sharma, M.K. (author), Frijns, A.J.H. (author), Mandamparambil, R. (author), Kooman, J.P. (author), Smeulders, D.M.J. (author)Patients with end stage renal disease are dependent on dialysis. In most outpatient centers, the dialysate is prepared with a fixed electrolyte concentration without taking into account the inter-individual differences of essential electrolytes (sodium, potassium and calcium). This one-size fits all approach can lead to acute and chronic...conference paper 2017
- document
-
Sharma, M.K. (author), Wieringa, F.P. (author), Frijns, A.J.H. (author), Kooman, J.P. (author)Introduction: End-stage renal disease (ESRD) patients depend on dialysis for removal of toxic waste products, fluid overload relief and maintenance of electrolyte balance. Dialysis prolongs millions of lives. To some extent, ESRD has become a manageable disease with a steadily growing dialysis population of increasing average age and associated...article 2016
- document
-
Li, Y. (author), Hoogeboom, P. (author), Russchenberg, H. (author)Fog is a significant factor affecting the public traffic because visibility is reduced to a large extent. Therefore the determination of optical visibility in fog from radar instruments has received much interest. To observe fog with radar, high frequency bands (millimeter waves) have the best option. A 35 GHz cloud radar at the Cabauw...conference paper 2014
- document
-
Li, Y. (author), Hoogeboom, P. (author), Russchenberg, H. (author)Fog is a significant factor affecting the public traffic because visibility is reduced to a large extent. Therefore the determination of optical visibility in fog from radar instruments has received much interest. To observe fog with radar, high frequency bands (millimeter waves) have the best option. A 35 GHz cloud radar at the Cabauw...conference paper 2014
- document
-
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
- document
-
Djapic, R. (author), Toh, Y. (author), Oostveen, J.C. (author)Accurate radio channel modeling is essential for simulation and performance prediction of wireless sensor networks (WSNs). This paper presents results of radio channel measurements performed in a difficult propagation environment. In particular, signal path loss is measured in case transmit and receive antennas are placed directly on a metal...conference paper 2013
- document
-
Westerveld, W.J. (author), Leinders, S.M. (author), van Dongen, K.W.A. (author), Urbach, H.P. (author), Yousefi, M. (author)Marcatili's famous approximate analytical description of light propagating through rectangular dielectric waveguides, published in 1969, gives accurate results for low-index-contrast waveguides. However, photonic-integrated circuit technology has advanced to high-index-contrast (HIC) waveguides. In this paper, we improve Marcatili's model by...article 2012
- document
-
Westerveld, W.J. (author), Leinders, S.M. (author), Pozo Torres, J.M. (author), van Dongen, K.W.A. (author), Yousefi, M. (author), Urbach, H.P. (author)Marcatili’s famous approximate analytical description of light propagating through rectangular dielectric waveguides, published in 1969, gives accurate results for low-indexcontrast waveguides. However, silicon-on-insulator (SOI) technology has become one of the focus platforms for integrated optics over the last decade, and the silicon...conference paper 2012
- document
-
Schiferli, W. (author), Cheng, L.K. (author), Jansen, T.H. (author)Measuring flow is essentia ìn the process and oil & gas ìndustry. In the oil and gas industry, orifice plates and vortex meters are popular, since their lack of moving parts makes them robust. However, the need for electronics limits maximum process temperatures to 150 to 200'C. Special electronics can go up to 1100'C, but this makes the meter...article 2012
- document
-
Chakkalakkal Abdulla, S.M.C. (author), Harmsma, P.J. (author), Nieuwland, R.A. (author), Pozo Torres, J.M. (author), Lemmen, M.H.J. (author), Sadeghian Marnani, H. (author), van den Berg, J.H. (author), Bodis, P. (author), Buskens, P. (author)A compact, mass producible Silicon On Insulator (SOI) based pressure sensor consisting of a folded Micro Ring Resonator (MRR) on a circular diaphragm is successfully designed, fabricated and characterized. An application of pressure deflects the diaphragm, causing stress in the MRR, which elongates the waveguide length and changes the effective...conference paper 2012
- document
-
Maurugeon, S. (author), Boussard-Plédel, C. (author), Troles, J. (author), Faber, A.J. (author), Lucas, P. (author), Zhang, X.H. (author), Lucas, J. (author), Bureau, B. (author), TNO Industrie en Techniek (author)Nulling interferometry is an important technique under development for the DARWIN planet finding mission which enables the detection of the weak infrared emission lines of an orbiting planet. This technique requires the use of single mode optical fibers transmitting light as far as possible in the infrared. Tellurium based glasses transmit...article 2010
- document
-
van Eijk, A.M.J. (author), Degache, M.A.C. (author), de Lange, D.J.J. (author), TNO Defensie en Veiligheid (author)Efficient military operations require insight in the capabilities of the available sensor package to reliably assess the operational theatre, as well as insight in the adversary’s capabilities to do the same. This paper presents the EOSTAR model suite, an end-to-end approach to assess the performance of electro-optical sensor systems in an...conference paper 2010
- document
-
Boersma, A. (author), Cheng, L.K. (author), Jansen, T.H. (author), TNO Industrie en Techniek (author)A distributed chemical sensor is developed by coating multiple Bragg gratings in a fibre with chemical selective responsive coatings. The optical response of the coated grating is optimised and the recoat process is very reproducible.conference paper 2010
- document
-
van Eijk, A.M.J. (author), TNO Defensie en Veiligheid (author)Electro-optical sensors detect the radiation emitted and/or reflected by objects. Outside the laboratory, where the distance between sensor and object may become large, the intervening atmosphere interacts with the radiation while it propagates to the sensor. The major propagation effects are (1) macroscopic refraction effects, (2) turbulence ...conference paper 2010
- document
-
Wu, H. (author), Emadi, A. (author), de Graaf, G. (author), Leijtens, J.A.P. (author), Wolffenbuttel, R.F. (author), TNO Industrie en Techniek (author)A 0.35 μm CMOS process has been used for on-chip integration of a sun sensor composed of a 2x2 photodiode array and a current-to-voltage amplifier. Unlike conventional sun sensors, a shade profile proportional to the angle of incidence of incoming light is projected onto the photodiodes. This concept enables an autonomous self-powered optical...conference paper 2009
- document
-
Optical characteristics of small surface targets, measured in the False Bay, South Africa; June 2007TNO Defensie en Veiligheid (author), de Jong, A.N. (author), Schwering, P.B.W. (author), Fritz, P.J. (author), Gunter, W.H. (author)During the False Bay trial (June 2007), the performance of a set of three optical sensors was tested against several small surface targets in a coastal area: a hyperspectral camera, a camera with a rotating polarization filter and a high resolution camera. One objective was the validation of a contrast and clutter model for the visual spectral...conference paper 2009
- document
-
Heijmans, J.A.C. (author), Cheng, L.K. (author), Wieringa, F.P. (author)The advantages of optical fibers as medical sensors are recognized world wide nowadays. Insensitivity to electromagnetic disturbances and relative small dimensions are the most well known properties. The advantages of fiber optic sensors are especially valuable within environments with high temperatures, aggressive or explosive chemicals, strong...conference paper 2008