Development of a Ground-penetrating Radar to Detect Excess Moisture in Pavement Subgrade PDF Download

Author: Robert C. Pippert
Publisher:
ISBN:
Category :
Languages : en
Pages : 142

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Author: Robert C. Pippert
Publisher:
ISBN:
Category : Ground penetrating radar
Languages : en
Pages : 96

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Book Description
The objective of this study was to design, fabricate, test and evaluate the use of a ground-penetrating radar to detect excess moisture in the pavement subgrade. The radar transmit antenna emits electromagnetic waves some of which penetrate the pavement surface and reflect from the subgrade soil. The strength of the return wave, captured by the receiving antenna, is partially determined by the moisture content of the subgrade. Existing test methods involved core drilling a hole in the pavement and extracting a sample from the subgrade. The act of drilling a hole damaged the pavement, was very time consuming, introduced moisture into the subgrade and at best only gave information about soil conditions at the spot where the sample was obtained. The use of the ground-penetrating radar provides a non-destructive means to evaluate highway pavement subgrade for excess moisture from a moving platform. Thus data are provided for a longitudinal strip of subgrade rather than individual core hole locations. The radar in general does not yield quantified moisture levels but shows changes in moisture levels as it moves along the highway. With further evaluation and more advanced signal processing, the radar has the potential to become a valuable instrument for highway subgrade moisture analysis.

Author: Cam Nguyen
Publisher: Springer
ISBN: 3319122711
Category : Technology & Engineering
Languages : en
Pages : 133

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This book presents the theory, analysis and design of microwave stepped-frequency radar sensors. Stepped-frequency radar sensors are attractive for various sensing applications that require fine resolution. The book consists of five chapters. The first chapter describes the fundamentals of radar sensors including applications followed by a review of ultra-wideband pulsed, frequency-modulated continuous-wave (FMCW), and stepped-frequency radar sensors. The second chapter discusses a general analysis of radar sensors including wave propagation in media and scattering on targets, as well as the radar equation. The third chapter addresses the analysis of stepped-frequency radar sensors including their principles and design parameters. Chapter 4 presents the development of two stepped-frequency radar sensors at microwave and millimeter-wave frequencies based on microwave integrated circuits (MICs), microwave monolithic integrated circuits (MMICs) and printed-circuit antennas, and discusses their signal processing. Chapter 5 provides the electrical characterization and test results of the developed microwave and millimeter-wave stepped-frequency radar sensors. Finally, a summary and conclusion is provided.

Author: Stanley S. Smith
Publisher:
ISBN:
Category : Ground penetrating radar
Languages : en
Pages : 196

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Author: Wade H. Shafer
Publisher: Springer Science & Business Media
ISBN: 1461519691
Category : Science
Languages : en
Pages : 426

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Masters Theses in the Pure and Applied Sciences was first conceived, published, and disseminated by the Center for Information and Numerical Data Analysis and Synthesis (CINDAS)* at Purdue University in 1957, starting its coverage of theses with the academic year 1955. Beginning with Volume 13, the printing and dis semination phases of the activity were transferred to University Microfilms/Xerox of Ann Arbor, Michigan, with the thought that such an arrangement would be more beneficial to the academic and general scientific and technical community. After five years of this joint undertaking we had concluded that it was in the interest of all concerned if the printing and distribution of the volumes were handled by an international publishing house to assure improved service and broader dissemination. Hence, starting with Volume 18, Masters Theses in the Pure and Applied Sciences has been disseminated on a worldwide basis by Plenum Publishing Corporation of New York, and in the same year the coverage was broadened to include Canadian universities. All back issues can also be ordered from Plenum. We have reported in Volume 38 (thesis year 1993) a total of 13,787 thesis titles from 22 Canadian and 164 United States universities. We are sure that this broader base for these titles reported will greatly enhance the value of this impor tant annual reference work. While Volume 38 reports theses submitted in 1993, on occasion, certain uni versities do report theses submitted in previous years but not reported at the time.

Author:
Publisher:
ISBN:
Category : Ground penetrating radar
Languages : en
Pages : 354

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Author:
Publisher:
ISBN:
Category : Highway engineering
Languages : en
Pages : 1006

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Author: Rexford M. Morey
Publisher: Transportation Research Board
ISBN: 9780309061100
Category : Technology & Engineering
Languages : en
Pages : 48

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This synthesis will be of interest to state Department of Transportation (DOT) geotechnical, bridge, and pavement engineers, engineering geologists, consultants involved with ground penetrating radar (GPR) investigations for state DOTs, and researchers. It describes the current state of the practice of using GPR for evaluating subsurface conditions for transportation facilities. This was accomplished by conducting a literature search and review and an extensive survey of U.S. and Canadian transportation agencies and practitioners, as well as limited international information collection. GPR is a noninvasive nondestructive tool used in transportation applications such as evaluation and characterization of pavement systems, soils, and environmental problems. This report of the Transportation Research Board presents information on the principles, equipment, logistics, applications, and limitations of GPR pertaining to transportation applications. Selected case studies for which ground truth information is available are presented. In addition, an extensive bibliography and glossary are provided as well as appending information about GPR manufacturers from their literature.

Author: Canadian Geotechnical Society
Publisher:
ISBN:
Category : Technology & Engineering
Languages : en
Pages : 488

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Author: Kenneth Maser
Publisher:
ISBN:
Category : Ground penetrating radar
Languages : en
Pages : 68

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