Searched for: author%3A%22van+der+Valk%2C+N.C.J.%22
(1 - 16 of 16)
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Molkenboer, F.T. (author), Jansen, R. (author), van Werkhoven, W.P. (author), Mulckhuyse, W.F.W. (author), van Schreven, E.L.C. (author), de Roode, B.J.M. (author), Haasnoot, H.J. (author), Abutan, A. (author), van der Valk, N.C.J. (author), Luijkx, T.S. (author)
public lecture 2021
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van Brug, H. (author), Visser, H. (author), Brenny, B.J.M. (author), van der Valk, N.C.J. (author), Sierk, B. (author), Heliere, A. (author), Rusli, S. (author), Landgraf, J. (author)
CarbonHIGS is a 2D imager designed to measure the enhancement of CO2 concentration in emission plumes from power plants. The origin of HIGS, and the physics of the working principle will be explained. Two possible implementations of HIGS will be presented, i.e. one that uses power splitting while the other one uses polarization splitting. The...
conference paper 2020
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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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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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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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Siegl, M. (author), van der Valk, N.C.J. (author), Veefkind, P. (author), Caron, J.F. (author), Leemhuis, A.P. (author), Bezy, J.L. (author)
The current paper introduces the novel `Compact NO2 Spectrometer', dedicated to facilitating future global NO2 remote sensing. It aims at a significantly smaller instrument size while looking to retain key performance parameters as established by TROPOMI. Its compact size will enable the instrument to be compatible with a multitude of different...
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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Brouwer, E.A.M. (author), van Buuren, R.A. (author), Gawlitta, N. (author), Grabarnik, S. (author), van der Valk, N.C.J. (author), Vink, H.J.P. (author), van Brug, H. (author), Visser, H. (author)
Earth observation measurements at wavelengths below 320nm are challenging due to the steep decrease of the earth irradiance towards shorter wavelengths. Stray light and ghosting of longer wave light can easily overwhelm the signals at short wavelengths. In the UV channel (270-320nm) of the TROPOMI instrument this challenge has been addressed...
conference paper 2017
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Cotel, A. (author), Liard, A. (author), Desserouer, F. (author), Pichon, P. (author), van der Valk, N.C.J. (author)
Optical components such as diffraction gratings are widely used in Space-flight satellites to analyse light properties from soft-X rays to Infra-Red. The diffraction gratings are one of the key optical components of space-flight instruments and have to exhibit very high optical performances. TROPOMI (Tropospheric Monitoring Instrument) is a...
conference paper 2017
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Voors, R. (author), de Vries, J. (author), van der Valk, N.C.J. (author), Bhatti, I. (author), Woods, D.M. (author), Aben, I. (author), Hoogeveen, R. (author), Veefkind, J.P. (author), Kleipool, Q. (author)
The Tropospheric Monitoring Instrument, TROPOMI, is a passive UV-VIS-NIR-SWIR spectrograph, which uses sun backscattered radiation to study the Earth's atmosphere and to monitor air quality, on both global and local scale. It follows in the line of SCIAMACHY (2002) and OMI (2004), both of which have been very successful. OMI is still operational...
conference paper 2013
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Voors, R. (author), de Vries, J. (author), Bhatti, I. (author), Lobb, D. (author), Wood, T. (author), van der Valk, N.C.J. (author), Aben, I. (author), Veefkind, J.P. (author)
TROPOMI, the Tropospheric Monitoring Instrument, is a passive UV-VIS-NIR-SWIR trace gas spectrograph in the line of SCIAMACHY (2002) and OMI (2004), instruments with the Netherlands in a leading role. Both instruments are very successful and remained operational long after their nominal life time.
conference paper 2012
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Jaspers, R.J.E. (author), Scheffer, M. (author), Kappatou, A. (author), van der Valk, N.C.J. (author), Durkut, M. (author), Snijders, B. (author), Marchuk, O. (author), Biel, W. (author), Pokol, G.I. (author), Erdei, G. (author), Zoletnik, S. (author), Dunai, D. (author)
A feasibility study for the use of core charge exchange recombination spectroscopy on ITER has shown that accurate measurements on the helium ash require a spectrometer with a high etendue of 1mm 2sr to comply with the measurement requirements [S. Tugarinov, Rev. Sci. Instrum. 74, 2075 (2003)]10.1063/1.1537443. To this purpose such an instrument...
article 2012
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de Vries, J. (author), Hoogeveen, R. (author), Voors, R. (author), Kleipool, Q. (author), Veefkind, P. (author), Aben, I. (author), Snel, R. (author), van der Valk, N.C.J. (author), Visser, H. (author), Otter, G.C.J. (author)
TROPOMI is the sun backscatter trace gas instrument on ESA's Sentinel-5 precursor satellite. TROPOMI builds upon a rich heritage from similar instruments, the main ones being SCIAMACHY on ESA's ENVISAT and OMI on NASA's AURA satellite. This paper explains how the technology from the heritage instruments evolved, considering high level design...
conference paper 2012
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Dumortier, P. (author), Huijser, T. (author), D'Inca, R. (author), Faugel, H. (author), Hangan, D. (author), Huygen, S. (author), Messiaen, A. (author), Onyshchenko, A. (author), Siegl, G. (author), van der Valk, N.C.J. (author), Vervier, M. (author)
RF arc detection is a key operational and safety issue for ICRF systems. Dedicated measurements on a RF test-stand were made in order to characterize the optical signature of RF arcs (time and spectrum) to assess the potential of optical arc detection on ICRF systems. Time-resolved intensity measurements were carried out using high-speed Si...
article 2011
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Klinkhamer, J.F.F. (author), van der Valk, N.C.J. (author), von Hellermann, M.G. (author), Jaspers, R. (author), TNO Industrie en Techniek (author)
In this paper the use of the Cramer-Rao lower bound (CRLB) to aid in the design of diagnostic systems dealing with complex spectra is discussed. Specifically it is discussed how a priori knowledge, used to improve the estimation, can be included in the CRLB analysis. This provides improved predictions for the spectrometer characteristics that...
article 2008
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