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Model Based Approach To Uxo Imaging Using The Time Domain Electromagnetic Method
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Book Synopsis Model Based Approach to UXO Imaging Using the Time Domain Electromagnetic Method by :
Download or read book Model Based Approach to UXO Imaging Using the Time Domain Electromagnetic Method written by and published by . This book was released on 1999 with total page 10 pages. Available in PDF, EPUB and Kindle. Book excerpt: Time domain electromagnetic (TDEM) sensors have emerged as a field-worthy technology for UXO detection in a variety of geological and environmental settings. This success has been achieved with commercial equipment that was not optimized for UXO detection and discrimination. The TDEM response displays a rich spatial and temporal behavior which is not currently utilized. Therefore, in this paper the author describes a research program for enhancing the effectiveness of the TDEM method for UXO detection and imaging. Fundamental research is required in at least three major areas: (a) model based imaging capability i.e. the forward and inverse problem, (b) detector modeling and instrument design, and (c) target recognition and discrimination algorithms. These research problems are coupled and demand a unified treatment. For example: (1) the inverse solution depends on solution of the forward problem and knowledge of the instrument response; (2) instrument design with improved diagnostic power requires forward and inverse modeling capability; and (3) improved target recognition algorithms (such as neural nets) must be trained with data collected from the new instrument and with synthetic data computed using the forward model. Further, the design of the appropriate input and output layers of the net will be informed by the results of the forward and inverse modeling. A more fully developed model of the TDEM response would enable the joint inversion of data collected from multiple sensors (e.g., TDEM sensors and magnetometers). Finally, the author suggests that a complementary approach to joint inversions is the statistical recombination of data using principal component analysis. The decomposition into principal components is useful since the first principal component contains those features that are most strongly correlated from image to image.
Book Synopsis Efficient, Realistic Physics-Based Modeling for Buried UXO Based on Time-Domain Electromagnetic Scattering Signatures by :
Download or read book Efficient, Realistic Physics-Based Modeling for Buried UXO Based on Time-Domain Electromagnetic Scattering Signatures written by and published by . This book was released on 2005 with total page 8 pages. Available in PDF, EPUB and Kindle. Book excerpt: The aim of this effort was to deliver to SERDP a software product suitable for transition to time-domain electromagnetic (TDEM) based sensors currently used for UXO discrimination. The methodology was intended to simultaneously address the requirements of (i) high fi-delity physics-based modelling for realistic target shapes and (ii) vastly accelerated CPU efficiency for forward modeling and inversion, and subsequent discrimination. This aim has essentially been achieved, as described below, through continued development of our highly efficient "mean field" approach, together with the development of an entirely new complementary "early time" approach, to high contrast EM scattering. This Final Report will summarize the substantial advances we have made, describe the nature of the work that still needs to be done to turn our results into a final self-contained product; and finally describe our ongoing and planned future efforts to transition that product to laboratory and field use.
Book Synopsis Electromagnetic Methods in Applied Geophysics by : Misac N. Nabighian
Download or read book Electromagnetic Methods in Applied Geophysics written by Misac N. Nabighian and published by SEG Books. This book was released on 1988 with total page 989 pages. Available in PDF, EPUB and Kindle. Book excerpt: As a slag heap, the result of strip mining, creeps closer to his house in the Ohio hills, fifteen-year-old M. C. is torn between trying to get his family away and fighting for the home they love.
Book Synopsis The State of the Art Time-domain Wavefield Imaging Using a Discontinuous Galerkin Forward-backward Time-stepping Method by : Forouz Mahdinezhad Saraskanroud
Download or read book The State of the Art Time-domain Wavefield Imaging Using a Discontinuous Galerkin Forward-backward Time-stepping Method written by Forouz Mahdinezhad Saraskanroud and published by . This book was released on 2022 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: In this thesis, an efficient wavefield imaging technique of Forward/Backward Time-Stepping (FBTS) in the Time Domain (TD) is developed, employing the Discontinuous Galerkin Method (DGM) as the spatial-discretization technique. The FBTS method is based on calculating gradients of a TD cost functional with respect to the constitutive parameters of the target, and updating the modeled target using Conjugate Gradient (CG) method. The DGM and Runge-Kutta method are used to solve the mentioned problem, respectively, in space and time. We call this TD - Microwave Imaging (MWI) technique DGM-FBTS and present it, for the first time, for dispersive media. The electromagnetic (EM) two-dimensional non-dispersive Transverse Magnetic (TM) DGM-FBTS is compared to Frequency Domain (FD) imaging algorithms for synthetic and experimental imaging targets in terms of computational cost, the quality of results, and robustness. For the first time, a direct comparison of TD and single-frequency FD MWI, DGM-Contrast Source Inversion (CSI) and DGM-Gauss Newton Inversion (GNI) schemes are used as the FD counterparts, all implemented in Matlab. For experimental data, the DGM-FBTS algorithm shows a robust noise performance, generating higher-resolution results than the two FD methods. The DGM-FBTS formulation is also modified for quantitative ultrasound imaging with preliminary results presented, as a foundation for future experimental work in this area. This ultrasound imaging technique is validated briefly in this work, and it shows to be promising in quantitative wavefield imaging. Finally, a novel development and investigation of quantitative hybrid time- and frequency-domain techniques is presented, focusing on enhancing the performance of both FD and TD schemes by improving the inversion speed and image resolution, respectively. These hybrid schemes are tested/validated on experimental data to study their accuracy in the presence of measurement noise and system modeling error. These results show improvement of image resolution compared to stand-alone FD algorithms (especially for complicated targets) and improvement in computational time by an average of 44% compared to stand-alone TD algorithm.
Book Synopsis Integrated Imaging of the Earth by : Max Moorkamp
Download or read book Integrated Imaging of the Earth written by Max Moorkamp and published by John Wiley & Sons. This book was released on 2016-03-23 with total page 270 pages. Available in PDF, EPUB and Kindle. Book excerpt: Reliable and detailed information about the Earth’s subsurface is of crucial importance throughout the geosciences. Quantitative integration of all available geophysical and geological data helps to make Earth models more robust and reliable. The aim of this book is to summarize and synthesize the growing literature on combining various types of geophysical and other geoscientific data. The approaches that have been developed to date encompass joint inversion, cooperative inversion, and statistical post-inversion analysis methods, each with different benefits and assumptions. Starting with the foundations of inverse theory, this book systematically describes the mathematical and theoretical aspects of how to best integrate different geophysical datasets with geological prior understanding and other complimentary data. This foundational basis is followed by chapters that demonstrate the diverse range of applications for which integrated methods have been used to date. These range from imaging the hydrogeological properties of the near-surface to natural resource exploration and probing the composition of the lithosphere and the deep Earth. Each chapter is written by leading experts in the field, which makes this book the definitive reference on integrated imaging of the Earth. Highlights of this volume include: Complete coverage of the theoretical foundations of integrated imaging approaches from inverse theory to different coupling methods and quantitative evaluation of the resulting models Comprehensive overview of current applications of integrated imaging including hydrological investigations, natural resource exploration, and imaging the deep Earth Detailed case studies of integrated approaches providing valuable guidance for both experienced users and researchers new to joint inversion. This volume will be a valuable resource for graduate students, academics, industry practitioners, and researchers who are interested in using or developing integrated imaging approaches.
Download or read book The Leading Edge written by and published by . This book was released on 2006 with total page 820 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Remote Sensing in Applied Geophysics by : Chiara Colombero
Download or read book Remote Sensing in Applied Geophysics written by Chiara Colombero and published by MDPI. This book was released on 2020-12-07 with total page 318 pages. Available in PDF, EPUB and Kindle. Book excerpt: The Special Issue is focused on recent and upcoming advances in the combined application of remote sensing and applied geophysics. Applied geophysics analyzes the distribution of physical properties in the subsurface for a wide range of geological, engineering, and environmental applications at different scales. Seismic, electrical, magnetic, and electromagnetic methods are among the most applied and well-established geophysical techniques. These methods share the advantages of being non-invasive and exploring wide areas of investigation with respect to conventional methods (e.g., drilling). Geophysical surveys are usually carried out deploying or moving the appropriate instrumentation directly on the ground surface. However, recent technological advances have resulting in the development of innovative acquisition systems becoming more typical of the remote sensing community (e.g., airborne surveys). While applied geophysics mainly focuses on the subsurface, typical remote sensing techniques have the ability to accurately image the Earth’s surface with high-resolution investigations carried out by means of terrestrial, airborne, or satellite-based platforms. The integration of surface and subsurface information is often crucial for several purposes, including the processing of geophysical data, the characterization and time-lapse monitoring of surface and near-surface targets, and the reconstruction of highly detailed and comprehensive 3D models of the investigated areas. Recent contributions showing the added value of surface reconstruction and/or monitoring in the processing, interpretation, and cross-comparison of geophysical techniques for archaeological, environmental, and engineering studies are collected in this book. Pioneering geophysical acquisitions by means of innovative remote systems are also presented.
Book Synopsis Dissertation Abstracts International by :
Download or read book Dissertation Abstracts International written by and published by . This book was released on 2008 with total page 902 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author :North Atlantic Treaty Organization. Research and Technology Organization Publisher : ISBN 13 : Total Pages :172 pages Book Rating :4.:/5 (31 download)
Book Synopsis Advanced Pattern Recognition Techniques by : North Atlantic Treaty Organization. Research and Technology Organization
Download or read book Advanced Pattern Recognition Techniques written by North Atlantic Treaty Organization. Research and Technology Organization and published by . This book was released on 1998 with total page 172 pages. Available in PDF, EPUB and Kindle. Book excerpt: Pattern recognition is the extraction of consistent information from noisy spatiotemporal data. It can be and is currently being used in systems for battlefield supervision, smart weapons, and anti-counterfeiting of all kinds. A currrent application is the automatic detection of land mines and unexploded ordnance. (UXO). The methods employed can be subdivided in the following manner: (1) statistical methods, (2) neuro - methods, (3) fuzzy - methods, and (4) neuro fuzzy methods. Each of these methods has its special advantages and drawbacks, but all of them require the computation of feature variables from measurement or simulation data, e.g. from microwave backscattering. The Lecture series covers the following topics: (1) Introductory overview on pattern recognition techniques, (1) - (4); (2)Feature extraction for pattern recognition by; (a)Electromagnetic, magnetic, and acoustic singularity identification; (b)Model based scattering signatures; (c) Wavelet techniques; (d) SAR/ISAR imaging; (e)Bistatic microwave imaging; and (f)Electromagnetic inversion techniques; (3) Real-time implementation of pattern recognition methods; and (4)Introduction to software and hardware for pattern recognition.
Book Synopsis Electrical & Electronics Abstracts by :
Download or read book Electrical & Electronics Abstracts written by and published by . This book was released on 1997 with total page 1860 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis International Aerospace Abstracts by :
Download or read book International Aerospace Abstracts written by and published by . This book was released on 1999 with total page 974 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Public Roads written by and published by . This book was released on 2008 with total page 230 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author :Robert L. Spellicy Publisher :SPIE-International Society for Optical Engineering ISBN 13 : Total Pages :718 pages Book Rating :4.3/5 (91 download)
Book Synopsis Environmental Monitoring and Remediation Technologies by : Robert L. Spellicy
Download or read book Environmental Monitoring and Remediation Technologies written by Robert L. Spellicy and published by SPIE-International Society for Optical Engineering. This book was released on 1999 with total page 718 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Resistivity and Induced Polarization by : Andrew Binley
Download or read book Resistivity and Induced Polarization written by Andrew Binley and published by Cambridge University Press. This book was released on 2020-12-17 with total page 409 pages. Available in PDF, EPUB and Kindle. Book excerpt: A comprehensive text on resistivity and induced polarization covering theory and practice for the near-surface Earth supported by modelling software.
Book Synopsis Imaging with Electromagnetic Spectrum by : Annamalai Manickavasagan
Download or read book Imaging with Electromagnetic Spectrum written by Annamalai Manickavasagan and published by Springer. This book was released on 2014-05-15 with total page 209 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book demonstrates how imaging techniques, applying different frequency bands from the electromagnetic spectrum, are used in scientific research. Illustrated with numerous examples this book is structured according to the different radiation bands: From Gamma-rays over UV and IR to radio frequencies. In order to ensure a clear understanding of the processing methodologies, the text is enriched with descriptions of how digital images are formed, acquired, processed and how to extract information from them. A special emphasis is given to the application of imaging techniques in food and agriculture research.
Download or read book Hydrogeophysics written by Yorum Rubin and published by Springer Science & Business Media. This book was released on 2006-05-06 with total page 518 pages. Available in PDF, EPUB and Kindle. Book excerpt: This ground-breaking work is the first to cover the fundamentals of hydrogeophysics from both the hydrogeological and geophysical perspectives. Authored by leading experts and expert groups, the book starts out by explaining the fundamentals of hydrological characterization, with focus on hydrological data acquisition and measurement analysis as well as geostatistical approaches. The fundamentals of geophysical characterization are then at length, including the geophysical techniques that are often used for hydrogeological characterization. Unlike other books, the geophysical methods and petrophysical discussions presented here emphasize the theory, assumptions, approaches, and interpretations that are particularly important for hydrogeological applications. A series of hydrogeophysical case studies illustrate hydrogeophysical approaches for mapping hydrological units, estimation of hydrogeological parameters, and monitoring of hydrogeological processes. Finally, the book concludes with hydrogeophysical frontiers, i.e. on emerging technologies and stochastic hydrogeophysical inversion approaches.
Download or read book Pollution Abstracts written by and published by . This book was released on 1995 with total page 454 pages. Available in PDF, EPUB and Kindle. Book excerpt:
