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Sabbadini, A. (author), Massaad, J. (author), van Neer, P.L.M.J. (author), de Jong, N. (author), Verweij, M.D. (author)In recent years, several fitting techniques have been presented to reconstruct the parameters of a plate from its Lamb wave dispersion curves. Published studies show that these techniques can yield high accuracy results and have the potential of reconstructing several parameters at once. The precision with which parameters can be reconstructed...article 2022
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- Buendia, V.G. (author), Rodriguez, A.A. (author), Alrushud, K. (author), Podilchak, S.K. (author) conference paper 2022
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- Massaad, J. (author), van Neer, P.L.M.J. (author), van Willigen, D.M. (author), Sabbadini, A. (author), de Jong, N. (author), Pertijs, M.A.P. (author), Verweij, M.D. (author) article 2022
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Massaad, J. (author), van Neer, P.L.M.J. (author), van Willigen, D.M. (author), Sabbadini, A. (author), de Jong, N. (author), Pertijs, M.A.P. (author), Verweij, M.D. (author)Current ultrasonic clamp-on flow meters consist of a pair of single-element transducers which are carefully positioned before use. This positioning process consists of manually finding the distance between the transducer elements, along the pipe axis, for which maximum SNR is achieved. This distance depends on the sound speed, thickness and...article 2021
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Weemstra, C. (author), de Laat, J.I. (author), Verdel, A. (author), Smets, P. (author)Instrumental timing and phase errors are a notorious problem in seismic data acquisition and processing. These can be frequency independent, for example due to clock drift, but may also be frequency dependent, for example due to imperfectly known instrument responses. A technique is presented that allows both types of errors to be recovered in a...article 2021
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Alrushud, K.M. (author), Gomez-Guillamon Buendia, V.A. (author), Podilchak, S.K. (author)A planar quasi-endfire surface-wave antenna (SWA) using substrate integrated waveguide (SIW) technology for integration with CubeSats and other small satellites is proposed in this letter. This antenna can be attached to the body of the satellite, resulting in a compact and low-cost design. A quasi-endfire beam pattern is achieved by the...article 2021
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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)Current ultrasonic clamp-on flow meters are manually calibrated. This process is based on manual placement of two single-element transducers along a pipe wall. Due to the usually unknown pipe properties and inhomogeneities in the pipe geometry, the axial distance of the transducers needs to be manually calibrated to align the location of the...conference paper 2019
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Verdel, A. (author), van Haeringen, D. (author), Vandeweijer, V. (author), Carpentier, S. (author), Meekes, S. (author)We demonstrate in this geothermal exploration case study performed in The Netherlands that ambient noise seismic interferometry (ANSI) can be an effective and efficient method for obtaining surface wave dispersion curves, leading to shallow shear-wave velocity-depth profiles that can improve imaging of deep structures. As the ANSI method...conference paper 2019
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Martins, J.E. (author), Weemstra, C. (author), Ruigrok, E. (author), Verdel, A. (author), Jousset, P. (author), Hersir, G.P. (author)Tomographic imaging based on ambient seismic noise measurements has shown to be a powerful tool, especially in areas like Iceland, where the microseism illumination is excellent. In this paper, we produce a 3D S-wave tomographic image over the western Reykjanes Peninsula high-enthalpy geothermal fields and evaluate the reliability of the...article 2019
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de Laat, J. (author), Weemstra, C. (author), Verdel, A. (author), Jousset, P. (author), Blanck, H. (author)Timing errors are a notorious problem in seismic data acquisition and processing. A technique is presented that allows such time shifts to be detected and corrected in a systematic fashion. The methodology relies on virtual-source responses retrieved through the application of seismic interferometry (SI). In application to recordings of ambient...conference paper 2018
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Kruiver, P.P. (author), van Dedem, E. (author), Romijn, R. (author), de Lange, G. (author), Korff, M. (author), Stafleu, J. (author), Gunnink, J.L. (author), Rodriguez-Marek, A. (author), Bommer, J.J. (author), van Elk, J. (author), Doornhof, D. (author)A regional shear-wave velocity (VS) model has been developed for the Groningen gas field in the Netherlands as the basis for seismic microzonation of an area of more than 1000 km2. The VS model, extending to a depth of almost 1 km, is an essential input to the modelling of hazard and risk due to induced earthquakes in the region. The detailed VS...article 2017
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- Jansen, E. (author), De Jong, C. (author) conference paper 2016
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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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Dol, H.S. (author), Colin, M.E.G.D. (author), Ainlie, M.A. (author), Gerdes, F. (author), Schäfke, A. (author), Özkan Sertlekc, H. (author)This paper shows that it is possible to simulate realistic shallow-water acoustic communication channels using available acoustic propagation models. Key factor is the incorporation of realistic time-dependent sea surface conditions, including both waves and bubbles due to wind.conference paper 2013
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Zhang, X. (author), Paulssen, H. (author)The Gulf of California, which forms part of the Pacific-North American plate boundary, is an ideal place to investigate upper mantle dynamics in a continental rifting area. With 19 seismic stations located around the gulf, the NARS-Baja experiment (2002-2008) was designed to image its crustal and mantle structure. Here we present results of a...article 2012
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Arts, R.J. (author), Baradello, L. (author), Girard, J.F. (author), Kirby, G. (author), Lombardi, S. (author), Williamson, P. (author), Zaja, A. (author), TNO Bouw en Ondergrond (author)CO2 storage in the subsurface is becoming more and more attractive as a means to reduce CO2 emissions to the atmosphere and hence minimize human-induced global warming. The ability to monitor and verify these CO2 storage reservoirs is a key element for further implementation of other storage sites. Since the current sites fortunately do not...article 2009
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Visser, K. (author), Trampert, J. (author), Kennett, B.L.N. (author), TNO Bouw en Ondergrond (author)We thank Stuart Crampin for his interest in our recent paper but respectfully disagree when he argues that our measurements are not appropriate for inferring mantle anisotropy. The approximations we made are common and perfectly acceptable for the considered frequency band. The comment ignores a large part of the literature which investigated...article 2009
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Westerhoff, R.S. (author), Noorlandt, R.P. (author), TNO Bouw en Ondergrond (author)With the increasing amount of innovative geophysical sensors and sensor networks there is a need for faster and more controlled data processing and interpretation in order to cope with the abundance of data coming from monitoring systems. In this article, we are presenting a possible method to deal with automated processing of multi-station...conference paper 2008
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Gallina, I. (author), Delia Villa, A. (author), Galdi, V. (author), Pierro, V. (author), Capolino, F. (author), Enoch, S. (author), Tayeb, G. (author), Gerini, G. (author), TNO Defensie en Veiligheid (author)This letter deals with a study of aperiodically ordered textured (mushroom-type) high-impedance surfaces (HISs), and their possible application as artificial-magnetic-conductor groundplanes for low-profile directive antennas. In this framework, results from full-wave simulations are presented in order to characterize the electromagnetic response...article 2008
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Ettorre, M. (author), Bruni, S. (author), Gerini, G. (author), Neto, A. (author), Llombart, N. (author), Maci, S. (author), TNO Defensie en Veiligheid (author)This work proposes a new topology of antenna based on the use of Planar Circular Symmetric EBG with different periodicities. These periodicities are used to impose different propagation velocities of the dominant surface waves on different zones of the same dielectric substrate. The control of the dispersion characteristics guides the design...conference paper 2007
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