Searched for: author%3A%22Crowcombe%2C+W.E.%22
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Crowcombe, W.E. (author)
public lecture 2022
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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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Meskers, A.J.H. (author), Crowcombe, W.E. (author), Duque, C.M. (author), Ringers, M. (author), Otten, M.P.G. (author), van der Wiel, W.M. (author), Ester, F. (author), Gruijters, C. (author), van Neer, S. (author), Monna, B. (author), van den Eijkel, G. (author)
Ongoing drone developments and widespread commercialization have made drones appealing unmanned aerial platforms, they are versatile at low cost The vast amount of functionalities that drones can foresee in makes them attractive (and eventually inadmissible) assets for military missions. Two key functionalities of drones for military missions...
other 2019
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Kuiper, S. (author), Kramer, L. (author), Siegl, M. (author), Spierdijk, J.P.F. (author), Moens, T.M.N. (author), Peters, J. (author), Oostdijck, B. (author), Crowcombe, W.E. (author)
TNO’s is developing Coarse Pointing Assembly technology aimed at the needs for future laser communication systems.
other 2019
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Ringers, M. (author), Fritz, E.C. (author), Crowcombe, W.E. (author), de Man, H. (author), de Lange, T.J. (author), Hazelebach, R.L.M. (author), Meskers, A.J.H. (author), Otten, M.P.G. (author), Leemhuis, A.P. (author), Bell, D.A. (author)
HAPS, a station located on an object at an altitude of 20 to 50 km and at a specified, nominal, fixed point relative to the Earth (ITU RR Vol I 1.66a). A HAPS can be a unmanned airplane, a balloon, or an airship. All require electrical power to keep themselves and their payload functional. Since HAPS operate at much lower altitudes than...
other 2019
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de Lange, T.J. (author), de Man, H. (author), de Bruijn, D. (author), Hazelebach, R.L.M. (author), Rijnbeek, R.A. (author), Baeten, M.J.J. (author), Silvestri, F. (author), Human, J.D. (author), Witvoet, G. (author), Crowcombe, W.E. (author)
LEOCAT is an optical head for intersatellite communication currently under development by TNO (ESA ARTES contract). The objective of LEOCAT is to develop a low recurring cost low SWAP (Size Weight and Power) optical head for the optical satellite communication constellation market. The aim of LEOCAT is to achieve a data-rate of 10Gbit/s over a...
other 2019
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Kuiper, S. (author), Kramer, L. (author), Dekker, B. (author), Nieuwkoop, E. (author), Witvoet, G. (author), Human, J.D. (author), Lemmen, M.H.J. (author), Crowcombe, W.E. (author)
TNO’s FSM technology is based on a unique electromagnetic actuator. The key benefits of this technology for are: Large range; ±2˚ optical range (both axis) - High band width: Closed loop bandwidth > 1kHz - Highly compact; ø27x30mm with ø20mm mirror - Reliable; Redundant windings, no wear, Passed life-time testing.
other 2019
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Harmsma, P.J. (author), Crowcombe, W.E. (author), Dresscher, M. (author)
Photonic Integrated Circuits (PICs) are a key technology in the realization of laser satellite optical communication systems. Some PIC applications can build on existing fiber optic terrestial networks, other applications are satcom specific.
other 2019
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Kuiper, S. (author), Kramer, L. (author), Kooper, M. (author), Crowcombe, W.E. (author)
TNO’s is developing Coarse Pointing Assembly technology aimed at the needs for future laser communication systems.
other 2019
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Fritz, E.C. (author), van der Valk, N.C.J. (author), Witvoet, G. (author), Bos, A. (author), de Man, H. (author), Crowcombe, W.E. (author), van der Heijden, N. (author), Kerkhof, P.J. (author)
Cube satellite (cubesat) is a specific realization of a smallsat that is characterized by its volume changing in increments of 1dm3, or 1U. A (popular) 3U format cubesat is furthermore classified as a Nano satellite, as it typically has a mass between 1 and 10 kg. Within CubeSATs expanding the downlink data bandwidth is one of the central...
other 2019
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Bol, J.C.P. (author), Pettazzi, F. (author), de Man, H. (author), de Lange, T.J. (author), van Werkhoven, W.P. (author), Crowcombe, W.E. (author), Oosterling, J.A.J. (author), Verhoven, R. (author), de Goeje, M.P. (author), Verhofstad, F. (author), Nijkerk, M.D. (author), Gruijters, C. (author), van Neer, S. (author)
To accommodate such a massive satellite constellation with OCT’s, the following key drivers are identified for the space terminals: - Low Size, Weight and Power (SWaP): One of the key advantages of using optical communication wavelengths over RF wavelength is that it allows for highly compact and low power OCT’s. To fully realize this potential,...
other 2019
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Dresscher, M. (author), Human, J.D. (author), Witvoet, G. (author), van der Heiden, N. (author), den Breeje, R. (author), Kuiper, S. (author), Fritz, E.C. (author), Korevaar, C.W. (author), van der Valk, N.C.J. (author), de Lange, T.J. (author), Saathof, R. (author), Doelman, N.J. (author), Crowcombe, W.E. (author), Duque, C.M. (author), de Man, H. (author)
The anticipated capacity benefit of optical satellite communications has triggered a cascade of technology developments. In this paper, we present three such technologies, namely; i). A cube satellite laser terminal (CubeCAT), ii). A lower Earth orbit satellite optical head (LEOCAT) and iii). A calibration and verification test bench for coarse...
conference paper 2019
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Saathof, R. (author), Crowcombe, W.E. (author), Kuiper, S. (author), van der Valk, N.C.J. (author), Pettazzi, F. (author), de Lange, T.J. (author), Kerkhof, P.J. (author), van Riel, M.C.J.M. (author), de Man, H. (author), Truyens, D.C. (author), Ferrario, I. (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 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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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), Truyens, D.C. (author), Crowcombe, W.E. (author), Human, J.D. (author), Ferrario, I. (author), Calvo, R.M. (author), Poliak, J. (author), Barrios, R. (author), Giggenbach, D. (author), Fuchs, C. (author), Scalise, S. (author)
To overcome data rate limitations of RF communication links with satellites, TNO and DLR envision optical free-space communication feeder links for next generation high throughput satellites. This paper provides a feasibility assessment of such links and the technology needed. The main results of the link budget and the turbulence modeling of...
conference paper 2018
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Saathof, R. (author), Crowcombe, W.E. (author), Kuiper, S. (author), Pettazzi, F. (author), Vosteen, L.L.A. (author), van der Valk, N.C.J. (author), Truyens, D.C. (author), den Breeje, R. (author), Ferrario, I. (author)
This paper presents the activities performed by TNO in the field of Space Laser Communication Terminals for high-volume low cost applications, and its plans for the further development of the required technologies for space terminals with particular emphasis on highly reliable, high performance, cost effective terminals.
conference paper 2018
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Kuiper, S. (author), Fritz, E.C. (author), Crowcombe, W.E. (author), Liebig, T. (author), Kramer, G.F.I. (author), Witvoet, G. (author), Duivenvoorde, T. (author), Overtoom, A.J. (author), Rijnbeek, R.A. (author), van Zwet, E.J. (author), van Dijsseldonk, A. (author), den Boef, A. (author), Beems, M. (author), Levasier, L. (author)
Nowadays most overlay metrology tools assess the overlay performance based on marker features which are deposited next to the functional device features within each layer of the semiconductor device. However, correct overlay of the relatively coarse marker features does not directly guarantee correct overlay of the much smaller device features....
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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Sadeghian Marnani, H. (author), Herfst, R.W. (author), Winters, J. (author), Crowcombe, W.E. (author), Kramer, G.F.I. (author), van den Dool, T.C. (author), van Es, M.H. (author)
We have developed a high speed, miniature scanning probe microscope (MSPM) integrated with a Positioning Unit (PU) for accurately positioning the MSPM on a large substrate. This combination enables simultaneous, parallel operation of many units on a large sample for high throughput measurements. The size of the MSPM is 19 × 45 × 70 mm3. It...
article 2015
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Herfst, R.W. (author), Dekker, A. (author), Witvoet, G. (author), Crowcombe, W.E. (author), de Lange, T.J. (author), Sadeghian Marnani, H. (author)
One of the major limitations in the speed of the atomic force microscope (AFM) is the bandwidth of the mechanical scanning stage, especially in the vertical (z) direction. According to the design principles of “light and stiff” and “static determinacy,” the bandwidth of the mechanical scanner is limited by the first eigenfrequency of the AFM...
article 2015
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