Searched for: subject%3A%22Electromagnetic%255C%2Bwaves%22
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Massaad, J. (author), van Neer, P.L.M.J. (author), van Willigen, D.M. (author), Pertijs, M.A.P. (author), de Jong, N. (author), Verweij, M.D. (author)
Ultrasonic flow meters (UFMs) based on transducer arrays offer several advantages. With electronic beam steering, it is possible to tune the steering angle of the beam for optimal signal-tonoise ratio (SNR) upon reception. Moreover, multiple beams can be generated to propagate through different travel paths, covering a wider section of the flow...
article 2022
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Saeed, A. (author), Volker, A.W.F. (author), Martina, Q. (author), Alalouni, A. (author)
Scale and corrosion affect the production certainty of oil and gas well. Scale build-up reduces flow and ultimately could shut down production when it block to tubing completely. Corrosion of the tubing wall occurs very often simultaneously with scale build-up and affects the integrity of the tubing wall. Vital information about the integrity is...
conference paper 2019
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Stoevelaar, L.P. (author), Cernigoj, J. (author), Berzinš, J. (author), Silvestri, F. (author), Gerini, G. (author)
In this paper, an all-dielectric metasurface for surface enhanced Raman spectroscopy (SERS) is presented. The proposed design constitutes of an array of silicon (Si) dimers on top of thin film of silicon nitride (SiN), deposited on a glass substrate. The coupling mechanism between the dimers is based on two orthogonal guided waves in the SiN...
conference paper 2019
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Fockens, T.W.H. (author), Zwamborn, A.P.M. (author), Leferink, F. (author)
Radio noise of man-made origin has been measured and studied since the 50s of the past century. From that time on, especially in the last two decades, the electromagnetic environment has changed due to the wide spread and increasingly complicated electronic and computing equipment in domestic and work premises. Not only the character of man-made...
article 2019
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Yepes, C. (author), Cavallo, D. (author), Neto, A. (author), Gandini, E. (author), Monni, S. (author), van Vliet, F.E. (author)
conference paper 2017
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Veldhuizen, L.W. (author), Adhyaksa, G.W.P. (author), Theelen, M. (author), Garnett, E.C. (author), Schropp, R.E.I. (author)
In this study, we assess the charge carrier diffusive transport quality of traditional and emerging thin-film photoactive absorber materials used for photovoltaic applications. We use a steady-state photocarrier grating technique, which has so far been predominantly used for amorphous silicon-based materials, to obtain ambipolar diffusion...
article 2017
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van Leeuwen, C.J. (author), Yildirim, K.S. (author), Pawelczak, P. (author)
Wireless Power Transfer (WPT) technologies aim at getting rid of cables used by consumer devices for energy provision. As long distance WPT is becoming mature, the health impact of WPT becomes increasingly important to consider. In this paper we look at how to maximize the wireless power transfer to remote devices, while maintaining a safe level...
conference paper 2017
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van Neer, P.L.M.J. (author), Rasmijn, L.N.R. (author), Franse, W.J.M. (author), Geers, L. (author), Rasidovic, A. (author), Volker, A.W.F. (author)
Lately, there has been significant interest in the noninvasive manipulation of particles and liquids. The reported acoustic methods rely on either the acoustic radiation force or acoustic streaming. The latter can be used in developed flows to induce fluid velocities angled to the liquid flow direction. These methods often use standing wave...
conference paper 2015
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Volker, A.W.F. (author), van Zon, A.T. (author)
Corrosion is one of the industries major issues regarding the integrity of assets. Currently, inspections are conducted at regular intervals to ensure a sufficient integrity level of these assets. Cost reduction while maintaining a high level of reliability and safety of installations is a major challenge. There are many situations where the...
conference paper 2014
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Sertlek, H.O. (author), Ainslie, M.A. (author)
In shallow water propagation, the sound field depends on the proximity of the receiver to the sea surface, the seabed, the source depth, and the complementary source depth. While normal mode theory can predict this depth dependence, it can be computationally intensive. In this work, an analytical solution is derived in terms of the Faddeeva...
article 2014
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van Zon, A.T. (author), Volker, A.W.F. (author)
The concept of predictive maintenance using permanent sensors that monitor the integrity of an installation is an interesting addition to the current method of periodic inspections. Guided wave tomography had been developed to create a map of the wall thickness using the travel times of guided waves. It can be used for both monitoring and for...
conference paper 2014
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Moreau, L. (author), Hunter, A.J. (author), Velichko, A. (author), Wilcox, P.D. (author)
In nondestructive testing, being able to remotely locate and size defects with good accuracy is an important requirement in many industrial sectors, such as the petrochemical, nuclear, and aerospace industries. The potential of ultrasonic guided waves is well known for this type of problem, but interpreting the measured data and extracting...
article 2014
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Cavallo, D. (author), Neto, A. (author), Gerini, G. (author)
A wideband, wide-scan prototype phased array of connected dipoles has been manufactured and tested from 3 to 5 GHz. The array comprises 7 × 7 elements, each fed by a loop-shaped transformer to avoid common-mode resonances. Such resonances typically affect this type of arrays, with consequent degradation of the polarization performance. The...
conference paper 2012
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Cifola, L. (author), Cavallo, D. (author), Gerini, G. (author), Savoia, S. (author), Morini, A. (author), Venanzoni, G. (author)
In this work we describe an effective strategy for the avoidance of common-mode resonances excited in a printed array of loaded dipoles with inherent filtering properties (filtenna). Previous works demonstrated that, for E-plane scanning, such resonances occur due to the unbalanced excitation of the dipoles. The present approach is based on the...
conference paper 2012
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Berrier, A. (author), Offermans, P. (author), Cools, R. (author), van Megen, B. (author), Knoben, W. (author), Vecchi, G. (author), Rivas, J.G. (author), Crego-Calama, M. (author), Brongersma, S.H. (author)
The development of sensing schemes for the detection of health-threatening gases is an attractive subject for research towards novel integrated autonomous sensor systems. We report here on a novel way of sensing NO\2 by surface plasmon resonance (SPR) using a gas-sensitive layer composed of 5,10,15,20-Tetrakis(4-hydroxyphenyl)-21H,23H-porphine ...
article 2011
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Berrier, A. (author), Cools, R. (author), Arnold, C. (author), Offermans, P. (author), Crego-Calama, M. (author), Brongersma, S.H. (author), Gómez-Rivas, J. (author)
We experimentally demonstrate the active control of the coupling strength between porphyrin dyes and surface plasmon polaritons supported by a thin gold layer. This control is externally exerted by a gas flow and is reversible. The hybridized exciton-polariton branches resulting from the exciton-plasmon coupling display a splitting proportional...
article 2011
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Miorali, M. (author), Slob, E.C. (author), Arts, R.J. (author), TNO Bouw en Ondergrond (author)
A technique capable of capturing the dynamic of the reservoir fluids in the proximity of production wells would provide enormous benefit to the reservoir management; in fact, monitoring can be used to develop a feedback loop between measurements and control technologies to optimize the production. This paper examines the feasibility of a...
conference paper 2009
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Gerini, G. (author), Tijhuis, A. (author), TNO Defensie en Veiligheid (author)
The trends and needs in the development of technologies like antennas and microwave circuits have clearly indicated a constantly increasing level of complexity of these structures, as well as the need of efficient and accurate analysis and synthesis tools. Such tools should provide an efficient yet accurate design approach, avoiding or...
conference paper 2009
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Monni, S. (author), Bekers, D.J. (author), van Wanum, M. (author), van Dijk, R. (author), Neto, A. (author), Gerini, G. (author), van Vliet, F.E. (author), TNO Defensie en Veiligheid (author)
In this paper the concept of limiting Frequency Selective Surface (FSS) is presented. The design of a reconfigurable FSS equipped with PIN diodes, aimed at the protection of a radar receiver from high power impinging electromagnetic waves is outlined and verified against the measurement results of a hardware demonstrator.
conference paper 2009
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Pasian, M. (author), Neto, A. (author), Monni, S. (author), Ettorre, M. (author), Gerini, G. (author), TNO Defensie en Veiligheid (author)
This paper deals with the use of Frequency Selective Surfaces (FSS) to increase the Efficiency × Bandwidth product in Ultra-Wide Band (UWB) antenna arrays whose efficiency is limited by the front-to-back ratio. If the backing reflector is realized in one metal plane solution its location will be suitable as antenna ground plane only on a limited...
conference paper 2008
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