Distributed Acoustic Sensing for Imaging Near-surface Geology and Monitoring Traffic at Garner Valley, California PDF Download
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Languages : en
Pages : 98
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Book Description
Distributed Acoustic Sensing (DAS) is a relatively new technology that uses a fiber-optic cable as a sensor. DAS got its start in the energy industry for borehole monitoring and more recently has started being used in horizontal arrays. The DAS technique senses strain rates every 1 m over distances of up to 100 km of cable length with sampling rates as fast as 100 kHz. This dissertation uses a horizontal DAS array in Southern California to evaluate the use of DAS for imaging near-surface geology and monitoring traffic. The first chapter uses Multichannel Analysis of Surface Waves to evaluate the response of DAS to surface waves. Dispersion curves from the DAS array match well with results from 1) other instruments at the site, 2) ambient noise correlation functions using the same DAS array, and 3) previous studies at the site. The second chapter uses the DAS array to create 2D tomographic images of the site for a number of pixel sizes and the directional sensitivity of DAS is discussed. The third chapter explores the possibility of using DAS for traffic monitoring. Vehicle counts, relative amplitudes, and velocities are identified and prove DAS could be used for traffic monitoring.
Author:
Publisher:
ISBN:
Category :
Languages : en
Pages : 98
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Book Description
Distributed Acoustic Sensing (DAS) is a relatively new technology that uses a fiber-optic cable as a sensor. DAS got its start in the energy industry for borehole monitoring and more recently has started being used in horizontal arrays. The DAS technique senses strain rates every 1 m over distances of up to 100 km of cable length with sampling rates as fast as 100 kHz. This dissertation uses a horizontal DAS array in Southern California to evaluate the use of DAS for imaging near-surface geology and monitoring traffic. The first chapter uses Multichannel Analysis of Surface Waves to evaluate the response of DAS to surface waves. Dispersion curves from the DAS array match well with results from 1) other instruments at the site, 2) ambient noise correlation functions using the same DAS array, and 3) previous studies at the site. The second chapter uses the DAS array to create 2D tomographic images of the site for a number of pixel sizes and the directional sensitivity of DAS is discussed. The third chapter explores the possibility of using DAS for traffic monitoring. Vehicle counts, relative amplitudes, and velocities are identified and prove DAS could be used for traffic monitoring.
Author: Yingping Li
Publisher: John Wiley & Sons
ISBN: 1119521793
Category : Science
Languages : en
Pages : 324
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Book Description
A comprehensive handbook on state-of-the-art DAS technology and applications Distributed Acoustic Sensing (DAS) is a technology that records sound and vibration signals along a fiber optic cable. Its advantages of high resolution, continuous, and real-time measurements mean that DAS systems have been rapidly adopted for a range of applications, including hazard mitigation, energy industries, geohydrology, environmental monitoring, and civil engineering. Distributed Acoustic Sensing in Geophysics: Methods and Applications presents experiences from both industry and academia on using DAS in a range of geophysical applications. Volume highlights include: DAS concepts, principles, and measurements Comprehensive review of the historical development of DAS and related technologies DAS applications in hydrocarbon, geothermal, and mining industries DAS applications in seismology DAS applications in environmental and shallow geophysics The American Geophysical Union promotes discovery in Earth and space science for the benefit of humanity. Its publications disseminate scientific knowledge and provide resources for researchers, students, and professionals.
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Languages : en
Pages :
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In September 2013, an experiment using Distributed Acoustic Sensing (DAS) was conducted at Garner Valley, a test site of the University of California Santa Barbara (Lancelle et al., 2014). This submission includes noise cross-correlation functions (NCF) . Each file includes a NCF between two channels. The name of each channel denotes the distance in meters from starting point of the fiber-optic cable. Lancelle, C., N. Lord, H. Wang, D. Fratta, R. Nigbor, A. Chalari, R. Karaulanov, J. Baldwin, and E. Castongia (2014), Directivity and Sensitivity of Fiber-Optic Cable Measuring Ground Motion using a Distributed Acoustic Sensing Array (abstract # NS31C-3935), AGU Fall Meeting. https://agu.confex.com/agu/fm14/meetingapp.cgi#Paper/19828 The e-poster is available at: https://agu.confex.com/data/handout/agu/fm14/Paper_19828_handout_696_0.pdf.
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Category :
Languages : en
Pages :
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Book Description
In September 2013, an experiment using Distributed Acoustic Sensing (DAS) was conducted at Garner Valley, a test site of the University of California Santa Barbara (Lancelle et al., 2014). This submission includes one 45 kN shear shaker (called "large shaker" on the basemap) test for three different measurement systems. The shaker swept from a rest, up to 10 Hz, and back down to a rest over 60 seconds. Lancelle, C., N. Lord, H. Wang, D. Fratta, R. Nigbor, A. Chalari, R. Karaulanov, J. Baldwin, and E. Castongia (2014), Directivity and Sensitivity of Fiber-Optic Cable Measuring Ground Motion using a Distributed Acoustic Sensing Array (abstract # NS31C-3935), AGU Fall Meeting. https://agu.confex.com/agu/fm1/meetingapp.cgi#Paper/19828 The e-poster is available at: https://agu.confex.com/data/handout/agu/fm14/Paper_19828_handout_696_0.pdf.
Author: Sebastiano Foti
Publisher: CRC Press
ISBN: 0415678765
Category : Technology & Engineering
Languages : en
Pages : 492
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Book Description
Develop a Greater Understanding of How and Why Surface Wave Testing Works Using examples and case studies directly drawn from the authors’ experience, Surface Wave Methods for Near-Surface Site Characterization addresses both the experimental and theoretical aspects of surface wave propagation in both forward and inverse modeling. This book accents the key facets associated with surface wave testing for near-surface site characterization. It clearly outlines the basic principles, the theoretical framework and the practical implementation of surface wave analysis. In addition, it also describes in detail the equipment and measuring devices, acquisition techniques, signal processing, forward and inverse modeling theories, and testing protocols that form the basis of modern surface wave techniques. Review Examples of Typical Applications for This Geophysical Technique Divided into eight chapters, the book explains surface wave testing principles from data measurement to interpretation. It effectively integrates several examples and case studies illustrating how different ground conditions and geological settings may influence the interpretation of data measurements. The authors accurately describe each phase of testing in addition to the guidelines for correctly performing and interpreting results. They present variants of the test within a consistent framework to facilitate comparisons, and include an in-depth discussion of the uncertainties arising at each stage of surface wave testing. Provides a comprehensive and in-depth treatment of all the steps involved in surface wave testing Discusses surface wave methods and their applications in various geotechnical conditions and geological settings Explains how surface wave measurements can be used to estimate both stiffness and dissipative properties of the ground Addresses the issue of uncertainty, which is often an overlooked problem in surface wave testing Includes examples with comparative analysis using different processing techniques and inversion algorithms Outlines advanced applications of surface wave testing such as joint inversion, underwater investigation, and Love wave analysis Written for geotechnical engineers, engineering seismologists, geophysicists, and researchers, Surface Wave Methods for Near-Surface Site Characterization offers practical guidance, and presents a thorough understanding of the basic concepts.
Author: B. L. N. Kennett
Publisher: Cambridge University Press
ISBN: 9780521006637
Category : Science
Languages : en
Pages : 384
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Book Description
This book provides a guide to understanding of seismograms for graduate students, researchers, professionals in academia and the petroleum industry.
Author: Us Army Corps Of Engineers
Publisher: Military Bookshop
ISBN: 9781780397603
Category : Technology & Engineering
Languages : en
Pages : 192
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Book Description
This manual provides guidance on evaluating the condition of the concrete in a structure, relating the condition of the concrete to the underlying cause or causes of that condition, selecting an appropriate repair material and method for any deficiency found, and using the selected materials and methods to repair or rehabilitate the structure. Guidance is also included on maintenance of concrete and on preparation of concrete investigation reports for repair and rehabilitation projects. Considerations for certain specialized types of rehabilitation projects are also given.
Author: Richard D. Woods
Publisher: Science Publishers
ISBN:
Category : Science
Languages : en
Pages : 160
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Author: Arthur H. Hartog
Publisher: CRC Press
ISBN: 1351645307
Category : Science
Languages : en
Pages : 651
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Book Description
This book explains physical principles, unique benefits, broad categories, implementation aspects, and performance criteria of distributed optical fiber sensors (DOFS). For each kind of sensor, the book highlights industrial applications, which range from oil and gas production to power line monitoring, plant and process engineering, environmental monitoring, industrial fire and leakage detection, and so on. The text also includes a discussion of such key areas as backscattering, launched power limitations, and receiver sensitivity, as well as a concise historical account of the field’s development.
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Category :
Languages : en
Pages : 918
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