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Van der Neut, J. (author), Tatanova, M. (author), Thorbecke, J. (author), Slob, E. (author), Wapenaar, K. (author)With controlled-source seismic interferometry we aim to redatum sources to downhole receiver locations without requiring a velocity model. Interferometry is generally based on a source integral over cross-correlation (CC) pairs of full, perturbed (timegated), or decomposed wavefields. We provide an overview of ghosts, multiples, and spatial...journal article
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- Slob, W. (author) report 1993
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- Slob, E.C. (author) doctoral thesis 1994
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- Slob, W. (author) conference paper 2001
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- Gorriti, A.G. (author), Slob, E.C. (author) journal article 2005
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- Gorriti, A.G. (author), Slob, E.C. (author) journal article 2005
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- Gorriti, A.G. (author), Slob, E.C. (author) journal article 2005
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- Nierstrasz, D. (author), Slob, Wouter (author), Wagner, Karel (author) report 2006
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Lambot, S. (author), Antoine, M. (author), Vanclooster, M. (author), Slob, E.C. (author)We report on a laboratory experiment that investigates the effect of soil surface roughness on the identification of the soil electromagnetic properties from full-wave inversion of ground-penetrating radar (GPR) data in the frequency domain. The GPR system consists of an ultrawide band stepped-frequency continuous-wave radar combined with an off...journal article 2006
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Drijkoningen, G.G. (author), Rademakers, F. (author), Slob, E.C. (author), Fokkema, J.T. (author)Ground coupling are terms that describe the transfer from seismic ground motion to the motion of a geophone. In previous models, ground coupling was mainly considered as a disk lying on top of a half-space, not considering the fact that in current practice geophones are spiked and are buried for optimal response. In this paper we introduce a new...journal article 2006
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Ghose, R. (author), Slob, E.C. (author)For shallow subsoil, the estimates of in-situ porosity and water saturation are important, but until now it has been difficult to estimate them reliably. We relate seismic and GPR reflection coefficients to porosity and water saturation using a shared earth model. Using this model, we propose a method to integrate quantitatively seismic and GPR...journal article 2006
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Lopra, O. (author), Lambot, S. (author), Slob, E. (author), Vanclooster, M. (author), Macq, B. (author), Milisavljevic, N. (author)The application of ground-penetrating radar (GPR) in humanitarian demining labors presents two major challenges: (1) the development of affordable and practical systems to detect metallic and non-metallic antipersonnel (AP) landmines under different conditions, and (2) the development of accurate soil characterization techniques to evaluate soil...conference paper 2006
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Gorriti, A.G. (author), Ranada-Shaw, A. (author), Schoolderman, A.J. (author), Rhebergen, J.B. (author), Slob, E.C. (author)In this paper, the characterization of the electromagnetic soil properties of a blind lane used in a trial for a dual-sensor mine detector is presented. Several techniques are used and are compared here; Time Domain Reflectometry, gravimetric techniques and Frequency Domain Reflection and Transmission methods. The derived soil properties are...conference paper 2006
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Slob, E.C. (author)This report discusses possibilities of using radar technology in asphalt pavement investigations in several types of pavement. The main focus is on highly porous asphalt (OSA) and watertight asphalt concrete (WAB), as used in Dutch seawalls. The determinations of layer thickness as well as layer integrity are important goals. The asphalt...report 2006
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Lambot, S. (author), Weihermüller, L. (author), Huisman, J.A. (author), Vereecken, H. (author), Vanclooster, M. (author), Slob, E.C. (author)We analyze the common surface reflection and full-wave inversion methods to retrieve the soil surface dielectric permittivity and correlated water content from air-launched ground-penetrating radar (GPR) measurements. In the full-wave approach, antenna effects are filtered out from the raw radar data in the frequency domain, and full-wave...journal article 2006
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Lambot, S. (author), Slob, E.C. (author), Vanclooster, M. (author), Vereecken, H. (author)We propose an integrated electromagnetic-hydrodynamic inverse modeling approach for identifying field-scale unsaturated soil hydraulic properties and electric profiles from off-ground time-lapse ground-penetrating radar data. Hydrodynamic modeling based on the one-dimensional Richards' equation with homogeneous soil hydraulic parameters is used...journal article 2006
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Wapenaar, C.P.A. (author), Slob, E.C. (author), Snieder, R. (author)It has been shown by many authors that the cross correlation of two recordings of a diffuse wave field at different receivers yields the Green’s function between these receivers. Recently the theory has been extended for situations where time-reversal invariance does not hold (e.g., in attenuating media) and where source-receiver reciprocity...journal article 2006
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Slob, E.C. (author), Wapenaar, C.P.A. (author)It is shown that the electromagnetic Green's functions of any linear medium with arbitrary heterogeneity can be obtained from the cross?correlation, or the cross?convolution, of two recordings at different receiver locations in an open system. Existing representations are known for cross?correlations where time?reversal invariance is exploited...journal article 2007
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Plug, W.J. (author), Slob, E.C. (author), Bruining, J. (author), Moreno Tirado, L.M. (author)We present a tool that simultaneously measures the complex permittivity and the capillary pressure characteristics for multiphase flow. The sample holder is a parallel plate capacitor. A precision component analyzer is used to measure the impedance amplitude and phase angle as a function of frequency (1 kHz to 3 MHz). The complex impedance of...journal article 2007
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Plug, W.J. (author), Slob, E. (author), Van Turnhout, J. (author), Bruining, J. (author)The relation between capillary pressure (Pc) and interfacial area has been investigated by measuring Pc and the electric permittivity at 100 kHz simultaneously as function of the water saturation, (Sw). Drainage and imbibition experiments have been conducted for sand-distilled water-gas (CO2/N2) systems. The main capillary cycles and the...journal article 2007