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Huizing, Albert G. (author), Bloemen, Axel A.F. (author)
The new generation of air defence frigates has to be equipped with a high performance sensor suite to cope with the threat in future maritime scenarios. A multifunction radar (MFR) with a single rotating or multiple fixed phased array antennas is often the key element in this sensor suite because it can perform not only surveillance functions...
conference paper 1996
document
Lepelaars, E.S.A.M. (author)
In this paper, we investigate the feasibility of detecting defects in certain artificial heart valves by determining the electromagnetic behavior of some simple models with the aid of thin-wire integral equations. The idea is to use the stationary current that occurs at late times after the excitation of a closed loop as a discriminator. This...
article 2000
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Bloemenkamp, R.F. (author), van den Berg, P.M. (author)
The inverse problem of reconstructing a scattering object in a two-media background was analyzed using time-domain gradient-type method. The scattering object was illuminated successively by line sources located in the upper medium. The incident field from the line source was calculated using a spatial Fourier transforms in the x1-direction and...
conference paper 2001
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Steeghs, P. (author), Kester, L. (author), Gelsema, S. (author)
The use of the Radon transform and the Wigner-Radon power spectrum for ISAR motion compensation is described. It is shown that the local Radon power spectrum is closely related to the Cohen's class of quadratic time-frequency representations in a similar way as the Radon and Fourier transform are related. The peak of the local Radon transform is...
conference paper 2002
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Cremer, F. (author), de Jong, W. (author), Schutte, K. (author), Johnson, J.T. (author), Baertlein, B.A. (author)
A specular model has been used to predict the passive polarimetric infrared (IR) signature of surface-laid landmines. The signature depends on the temperature of the landmine and the sky radiance. The temperature of the landmine is measured using a thermocouple. The signature itself is measured using a polarimetric IR camera setup. The...
conference paper 2002
document
Colin, M.E.G.D. (author), Groen, J. (author)
An important issue in research on passive ASW operations is improvement in signal-to-noise ratio (SNR) and bearing resolution for targets emitting low frequency signals. One of the techniques believed to improve these characteristics is Synthetic Aperture Sonar (SAS). The method is based on the artificial enlargement of a sonar array by...
conference paper 2002
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van den Berg, P.M. (author), Korkmaz, E. (author), Abubakar, A. (author)
It is well-known that electromagnetic solutions of boundary integral equations for perfectly electrically conducting scatterers are nonunique for those frequencies which correspond to interior resonances of the scatterer. In this paper a simple and efficient computational method is developed, in which the interior integral representations,...
article 2003
document
Focardi, P. (author), McGrath, W.R. (author), Neto, A. (author), TNO Defensie en Veiligheid (author)
Twin-slot antennas and coplanar waveguides are a popular choice for coupling signals to state-of-the-art mixers and detectors at terahertz frequencies. Although these sensors show promising performance in terms of noise temperature, they usually also show a considerable downward shift in the center frequency of their spectral response,...
article 2005
document
Schwering, P.B.W. (author), van den Broek, S.P. (author), Kemp, R.A.W. (author), Lensen, H.A. (author), TNO Defensie en Veiligheid (author)
Present-day naval operations take place in coastal environments as well as narrow straits all over the world. Coastal environments around the world are exhibiting a number of threats to naval forces. In particular, a large number of asymmetric threats can be present in environments with cluttered backgrounds as well as rapidly varying...
conference paper 2010
document
Koster, N.B. (author), Molkenboer, F. (author), van Veldhoven, E. (author), Maas, D.J. (author), Verberk, R. (author), TNO Industrie en Techniek (author)
For EUVL to be successful it is essential that reticles can be made without defects and that they can be cleaned without causing any damage. Contamination of reticles can be in two ways: particles due to handling can cause printable defects and carbon contamination due to residual hydrocarbons can cause change in CD and loss of throughput. We...
conference paper 2010
document
Clairbois, J.-P. (author), de Roo, F. (author), Garai, M. (author), Conter, M. (author), Defrance, J. (author), Oltean-Dumbrava, C. (author), Fusco, I. (author)
Since the early 80's, one models noise propagation, in the early 90's one started to standardize how to measure the intrinsic characteristics of manufactured noise barriers: in 1997, the EU funded ADRIENNE research ([1] and [2]) was a first step, but many problems still remained. Since years, all the noise propagation software are still modeling...
conference paper 2010
document
Staats, J.P. (author), Harmsma, P.J. (author), Cheng, L.K. (author), Lo Cascio, D.M.R. (author), Yousefi, M. (author), TNO Industrie en Techniek (author)
The interferometer based on the fiber 3x3 coupler is already a well-known device for measuring displacements and wavelength shifts. TNO is currently working on the fabrication of an integrated version of this versatile interferometer on Silicon-On-Insulator. The integrated interferometer is expected to be far more stable then the fiber version,...
conference paper 2010
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Westerveld, W.J. (author), Urbach, H.P. (author), Yousefi, M. (author), TNO Industrie en Techniek (author)
conference paper 2010
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ter Haar, F.B. (author), den Hollander, R.J.M. (author), Dijk, J. (author), TNO Defensie en Veiligheid (author)
Moving object detection in urban scenes is important for the guidance of autonomous vehicles, robot navigation, and monitoring. In this paper moving objects are automatically detected using three sequential frames and tracked over a longer period. To this extend we modify the plane+parallax, fundamental matrix, and trifocal tensor algorithms to...
conference paper 2010
document
Valenziano, L. (author), Zerbi, F.M. (author), Cimatti, A. (author), Bianco, A. (author), Bonoli, C. (author), Bortoletto, F. (author), Bulgarelli, A. (author), Butler, R.C. (author), Content, R. (author), Corcione, L. (author), de Rosa, A. (author), Franzetti, P. (author), Garilli, B. (author), Gianotti, F. (author), Giro, E. (author), Grange, R. (author), Leutenegger, P. (author), Ligori, S. (author), Martin, L. (author), Mandolesi, N. (author), Morgante, G. (author), Nicastro, L. (author), Riva, M. (author), Robberto, M. (author), Sharples, R. (author), Spanó, P. (author), Talbot, G. (author), Trifoglio, M. (author), Wink, R. (author), Zamkotsian, F. (author), TNO Industrie en Techniek (author)
The Euclid Near-Infrared Spectrometer (E-NIS) Instrument was conceived as the spectroscopic probe on-board the ESA Dark Energy Mission Euclid. Together with the Euclid Imaging Channel (EIC) in its Visible (VIS) and Near Infrared (NIP) declinations, NIS formed part of the Euclid Mission Concept derived in assessment phase and submitted to the...
conference paper 2010
document
Rijnveld, N. (author), van der Neut, F.J.A. (author), Harmsma, P.J. (author), Lo Cascio, D.M.R. (author), Yousefi, M. (author), TNO Industrie en Techniek (author)
Coupling an optical chip to its surroundings is very hard compared to an electrical chip. This complexity is mainly caused by alignment and accuracy challenges and is driving the cost price up to levels at which the commercial benefits of optical chips are no longer obvious, despite their many great technological advantages. Up to 80% of an...
conference paper 2010
document
Xu, B. (author), Wind, J. (author), de Bree, H.E. (author), Basten, T.G.H. (author), Druyvesteyn, E. (author), TNO Industrie en Techniek (author)
An acoustic vector sensor array consists of multiple sound pressure microphones and particle velocity sensors. A pressure microphone usually has an omni-directional response, yet a particle velocity sensor is directional. Currently, acoustic vector sensor arrays are under investigation for far field source localization and visualization. One of...
conference paper 2010
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Gubbels, G.P.H. (author), van Drunen, C. (author), Böhm, G. (author), Arnold, T. (author), Kamphues, F.G. (author), Gielesen, W.L.M. (author)
TNO Science and Industry has designed and is currently developing the Basic Angle Monitoring Opto-Mechanical Assembly (BAM OMA) [1], which is part of the GAIA spacecraft. In GAIA two telescopes mounted on a slowly spinning satellite will measure the position of the stars with an accuracy much higher as ever done before. Crucial in the system is...
conference paper 2010
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Anitori, L. (author), Otten, M.P.G. (author), Hoogeboom, P. (author), TNO Defensie en Veiligheid (author)
In this paper we present some preliminary results on the application of Compressive Sensing (CS) to high resolution radar imaging. CS is a recently developed theory which allows reconstruction of sparse signals with a number of measurements much lower than what is required by the Shannon sampling theorem. This method has already found its way in...
conference paper 2010
document
Harmsma, P.J. (author), TNO Industrie en Techniek (author)
What are the hurdles to be taken to transfer a photonic concept to a money-making commercial product? In this paper we address a number of these hurdles, and discuss the current situation.
conference paper 2010
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