Searched for: subject:"interferometry"
(1 - 20 of 171)

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Fuchs, Elmar C. (author), Woisetschläger, Jakob (author), Wexler, Adam D. (author), Pecnik, R. (author), Vitiello, Giuseppe (author)
A horizontal electrohydrodynamic (EHD) liquid bridge (also known as a “floating water bridge”) is a phenomenon that forms when high voltage DC (kV·cm<sup>-1</sup>) is applied to pure water in two separate beakers. The bridge, a free-floating connection between the beakers, acts as a cylindrical lens and refracts light. Using an...
journal article 2021
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Konijnenberg, A.P. (author), Adam, A.J.L. (author), Urbach, Paul (author)
This book treats optics at the level of students in the later stage of their bachelor or the beginning of their master. It is assumed that the student is familiar with Maxwell’s equations. Although the book takes account of the fact that optics is part of electromagnetism, special emphasis is put on the usefulness of approximate models of optics...
book 2021
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Chamarczuk, Michał (author), Malinowski, Michał (author), Draganov, D.S. (author)
Despite the unrivalled spatial resolution and depth penetration of active-source seismic methods used for mineral exploration in hardrock environment, economic and environmental restrictions (e.g., source permitting) may preclude its full-scale application. In such a case, 2D passive reflection seismics can be considered a cost-effective way...
journal article 2021
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van IJsseldijk, J.E. (author), Wapenaar, C.P.A. (author)
The Marchenko method retrieves the responses to virtual sources in the Earth's subsurface from reflection data at the surface, accounting for all orders of multiple reflections. The method is based on two integral representations for focusing- A nd Green's functions. In discretized form, these integrals are represented by finite summations...
journal article 2021
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Czikhardt, Richard (author), van der Marel, H. (author), Papco, Juraj (author)
Artificial radar reflectors, such as corner reflectors or transponders, are commonly used for radiometric and geometric Synthetic Aperture Radar (SAR) sensor calibration, SAR interferometry (InSAR) applications over areas with few natural coherent scatterers, and InSAR datum connection and geodetic integration. Despite the current abundance...
journal article 2021
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van Rooij, J. (author)
Optical imaging is the imaging of objects with visible light. It is a tool often used for diagnostic purposes, such as in biomedical and material sciences. Digital holography is an optical imaging technique that captures and images the amplitude as well as the phase (the complex amplitude) of the lightwave. An advantage is that the complex...
doctoral thesis 2020
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Yang, M. (author)
Multi-epoch Synthetic Aperture Radar Interferometry (InSAR) is widely used to estimate displacements of selected scatterers from phase observations. However, their interpretation needs a connection to objects in the real world. <br/><br/>To associate InSAR scatterers to their corresponding geo-objects, it is necessary to (i) accurately estimate...
doctoral thesis 2020
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Ozer, I.E. (author)
Flood defense systems are critical in protecting against catastrophic events which often lead to significant damage, fatalities or substantial socio-economic and environmental impact. Even though levees form a significant part of the existing flood defense systems, there is a limited knowledge of the different levee behavior processes and the...
doctoral thesis 2020
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Zotz-Wilson, R.D. (author)
We all monitor the world around us through waves. After about sixteen weeks in the womb, the ears and eyes of an infant child begin to deliver the first signals of light and sound waves to the brain. In fact, one could argue that consciousness itself is the feeling one receives when processing large amounts of wavefield data. Despite the...
doctoral thesis 2020
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Casas, José Augusto (author), Badi, Gabriela Alejandra (author), Franco, Luis (author), Draganov, D.S. (author)
The Planchón-Peteroa Volcanic Complex (PPVC) is located in the Central Andes, Argentina-Chile. Even though this active volcanic system is considered one of the most dangerous volcanoes in the region, with more than twenty modest (VEI &lt; 4) Holocene eruptions, knowledge of its subsurface structures, internal processes, dynamics, and their...
journal article 2020
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Milillo, Pietro (author), Giardina, Giorgia (author), Perissin, Daniele (author), Milillo, Giovanni (author), Coletta, Alessandro (author), Terranova, Carlo (author)
We would like to thank our colleagues for their comment, as we believe that this discussion further highlights the importance of innovative research in the emerging field of InSAR applications to civil engineering structures. We discuss the statement from Lanari et al. (2020): “Our analysis shows that, although both the SBAS and the TomoSAR...
journal article 2020
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Wapenaar, C.P.A. (author)
With the Marchenko method, Green’s functions in the subsurface can be retrieved from seismic reflection data at the surface. State-of-the-art Marchenko methods work well for propagating waves but break down for evanescent waves. This paper discusses a first step towards extending the Marchenko method for evanescent waves and analyses its...
journal article 2020
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Wapenaar, C.P.A. (author)
Marchenko equation enables one to retrieve the up/down components of the Green’s function. We propose an iterative scheme to relax the need for up/down separation for focusing. By presenting a visual tour, we show how to retrieve the Green’s function in the subsurface at a pre-defined location without requiring component decomposition. Our...
conference paper 2020
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Shi, G. (author), Hei, K. (author), Wang, Wen (author), Bhattacharya, N. (author)
Distance measurement using frequency sweeping interferometry is an absolute distance measurement technique that allows for high accuracy over long distances. Notwithstanding, the measurement accuracy is affected by laser sweeping nonlinearity and limited sweeping range. In this work, an optimized post-processing linearization method is...
journal article 2020
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Haagmans, Roger (author), Siemes, C. (author), Massotti, Luca (author), Carraz, Olivier (author), Silvestrin, Pierluigi (author)
The paper addresses the preparatory studies of future ESA mission concepts devoted to improve our understanding of the Earth’s mass change phenomena causing temporal variations in the gravity field, at different temporal and spatial scales, due to ice mass changes of ice sheets and glaciers, continental water cycles, ocean masses dynamics and...
review 2020
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Weemstra, C. (author), De Laat, Janneke I. (author), Verdel, Arie (author), Smets, P.S.M. (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...
journal article 2020
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Yang, M. (author), Dheenathayalan, P. (author), Lopez Dekker, F.J. (author), van Leijen, F.J. (author), Liao, Mingsheng (author), Hanssen, R.F. (author)
Persistent Scatterer Interferometry (PSI) is a time series remote sensing technique to estimate displacements of geo-objects from the interferometric phases of selected Persistent Scatterers (PS). The relative position of a scatterer within a resolution cell causes an additional phase contribution in the observed phase, which needs to be...
journal article 2020
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Balestrini, F.I. (author), Draganov, D.S. (author), Malehmir, Alireza (author), Marsden, Paul (author), Ghose, R. (author)
In mineral exploration, new methods to improve the delineation of ore deposits at depth are in demand. For this purpose, increasing the signal-to-noise ratio through suitable data processing is an important requirement. Seismic reflection methods have proven to be useful to image mineral deposits. However, in most hard rock environments,...
journal article 2020
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Dheenathayalan, P. (author)
Time-series synthetic aperture radar interferometry (InSAR) has evolved into a widely preferred geodetic technique for measuring topography and surface deformation of the earth. In the last decades, time-series InSAR methodologies were developed to extract information from persistent scatterers (PS) and distributed scatterers (DS). Methodologies...
doctoral thesis 2019
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Marinkovic, I. (author)
This thesis explores the possibility of controlling the quantum states of high frequency mechanical resonators using infra-red laser pulses. Chapter 1 gives an overview of quantum technologies based on mechanical resonators relevant for this thesis. Chapter 2 provides the basics of the theoretical background of optomechanics. The Hamiltonian...
doctoral thesis 2019
Searched for: subject:"interferometry"
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