Download or read book Experiments with a Fiber Optic Soil Moisture Sensor written by Randolph Samuel Alessi and published by . This book was released on 1985 with total page 192 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Development and Field Implementation of a Distributed Soil Moisture Sensor Using Heated Fiber Optics written by Arlen M. Striegl and published by . This book was released on 2011 with total page 240 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book A Novel Fiber optic Soil Moisture Sensor Based on Total Internal Reflection of Light written by Aisha B. Fields and published by . This book was released on 1999 with total page 106 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Special Report written by and published by . This book was released on 1990 with total page 28 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Fiber Optic Distributed Temperature Sensing of Soil Moisture in Waste Rock written by Qiong Robert Wu and published by . This book was released on 2021 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: "One of the most challenging aspects of controlling contamination in mining operations is the management of tailings and waste rock piles. Waste rock is the material extracted from a mine that has no economic value and may be a source of contamination from acid or neutral mine drainage. Only in recent decades have mining operations incorporated covers in the design of waste rock piles to prevent the infiltration of water and oxygen, increase chemical stabilization, and minimize contaminant leachate. This thesis focuses on the distributed measurement of soil moisture in a waste rock pile using active fiber optic distributed temperature sensing (aFO-DTS). Soil moisture is measured by heating the metal casing of a fiber optic cable and evaluating the thermal response. This emerging geophysical method allows for the measurement of soil moisture continuously along several kilometers of fiber optic cable, with measurement spacing every half meter, and a temporal resolution of less than an hour per measurement. In this thesis, I undertake three projects: (1) A laboratory column experiment in which the fiber optic cable was buried in two layers of soils with different hydrogeologic properties. By using aFO-DTS, I evaluate the spatial resolution of soil moisture in the column and at the interface between the two layers of soil using the created protocol. (2) I apply my new aFO-DTS method to a constructed test waste-rock pile at the Lac Tio mine in eastern Quebec. The test pile is using a new capillary barrier cover design. By using aFO-DTS, I assess the temporal distribution of soil moisture at different depths within the pile (3). I test uncertainties and common assumptions used by aFO-DTS methods using a numerical model. To date, there has been very little analysis of the potential errors related to subsurface heterogeneity and method calibration. The rate and period of recharge are found to be among the largest potential sources of error and require careful calibration when using the aFO-DTS method"--

Download or read book Instrumentation and Control Systems for Nuclear Power Plants written by Mauro Cappelli and published by Woodhead Publishing. This book was released on 2023-03-21 with total page 1114 pages. Available in PDF, EPUB and Kindle. Book excerpt: Instrumentation and Control Systems for Nuclear Power Plants provides the latest innovative research onthe design of effective modern I&C systems for both existing and newly commissioned plants, along withinformation on system implementation. Dr. Cappelli and his team of expert contributors cover fundamentals,explore the most advanced research in control systems technology, and tackle topics such as the human–machine interface, control room redesign, and control modeling. The inclusion of codes and standards,inspection procedures, and regulatory issues ensure that the reader can confidently design their own I&Csystems and integrate them into existing nuclear sites and projects. - Covers various viewpoints, including theory, modeling, design and applications of I&C systems - Includes codes and standards, inspection procedures and regulatory issues - Combines engineering and physics aspects in one thorough resource, presenting human factors, modeling and HMI together for the first time - Instrumentation and Control Systems for Nuclear Power Plants highlights the key role nuclear energy plays in the transition to a lower-carbon energy mix

Download or read book Characterization Monitoring and Sensor Technology Integrated Program CMST IP written by United States. Department of Energy and published by . This book was released on 1994 with total page 180 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Using Fiber optic Distributed Temperature Sensing to Assess Soil Temperature Bulk Soil Thermal Properties and Soil Moisture Within the Shallow Subsurface written by Lucas Matthew Williamson and published by . This book was released on 2012 with total page 342 pages. Available in PDF, EPUB and Kindle. Book excerpt: There currently exists a gap in the field scale measurement of many soil properties. Particularly, efficient measurement of soil moisture over the field scale at depths below the top few centimeters of the soil column has proven elusive. Distributed temperature sensing (DTS) allows for the nearly continuous measurement of temperature over both a spatial and temporal scale by use of standard fiber optic cables. Measurement of temperature progression throughout a soil column can lead to estimates of bulk soil thermal properties. Theoretically, these estimated thermal properties used in conjunction with determined soil characteristics can then provide soil moisture estimates. At an experimental field site in Smith Valley, three fiber optic cables were installed into the shallow subsurface in a vertical profile at depths of 5, 10, and 15 centimeters. Cables were placed within plots of various crop types and varying irrigation schedules. The effect of both surface crop type and irrigation on subsurface soil temperature is analyzed and presented. Through inversion of the conduction equation, spatial and temporal results of thermal diffusivity across the field are assessed. Thermal response of the soil changes in accordance with wetting due to irrigation, as well as subsequent drying up of the soil.In terms of soil moisture, it continues to be difficult to accurately provide quantitative estimates, although drier soils provide much better estimates than do wet soils. Soil moisture estimates were in general agreement with observed values, but prior knowledge of the general wetness of the soil is necessary to improve the estimate. In a non-irrigated plot of tef ( eragrostis tef ), observed volumetric moisture values from the top 5 centimeters of soil ranged from 0.02 m3 /m3 to 0.18 m3 /m3 , while the estimated soil moisture contents integrated over a depth of 5 to 15 centimeters stayed fairly consistent around 0.12 m3 /m3 throughout the 25-day period. The effects of irrigation and cloudy conditions were clearly discernible, as were the relative differences between those plots receiving significant irrigation and those that remained drier throughout the study. The use of DTS in such an application can provide highly detailed pictures of temporally changing soil temperature, but progression to soil moisture estimation still remains challenging due to the non-uniqueness of the relation between soil thermal diffusivity and soil moisture content.

Download or read book Optical Phenomenology and Applications written by Masoud Ghandehari and published by Springer. This book was released on 2018-05-26 with total page 256 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book is an introduction to techniques and applications of optical methods for materials Characterization in civil and environmental engineering. Emphasizing chemical sensing and diagnostics, it is written for students and researchers studying the physical and chemical processes in manmade or natural materials. Optical Phenomenology and Applications - Health Monitoring for Infrastructure Materials and the Environment, describes the utility of optical-sensing technologies in applications that include monitoring of transport processes and reaction chemistries in materials of the infrastructure and the subsurface environment. Many of the applications reviewed will address long standing issues in infrastructure health monitoring such as the alkali silica reaction, the role of pH in materials degradation, and the remote and inset characterization of the subsurface environment. The remarkable growth in photonics has contributed immensely to transforming bench-top optical instruments to compact field deployable systems. This has also contributed to optical sensors for environmental sensing and infrastructure health monitoring. Application of optical waveguides and full field imaging for civil and environmental engineering application is introduced and chemical and physical recognition strategies are presented; this is followed by range of filed deployable applications. Emphasizing system robustness, and long-term durability, examples covered include in-situ monitoring of transport phenomena, imaging degradation chemistries, and remote sensing of the subsurface ground water.

Download or read book Soil Water Solute Process Characterization written by Javier Alvarez-Benedi and published by CRC Press. This book was released on 2004-12-28 with total page 816 pages. Available in PDF, EPUB and Kindle. Book excerpt: The practitioner or researcher often faces complex alternatives when selecting a method to characterize properties governing a soil process. After years of research and development, environmental and agricultural professionals now have an array of methods for characterizing soil processes. Well-established methods, however, may not be suitable for

Download or read book Experimental Study of the Applications of Fiber Optic Distributed Temperature Sensors in Detecting Seepage in Soils written by Henglin Xiao and published by . This book was released on 2013 with total page 9 pages. Available in PDF, EPUB and Kindle. Book excerpt: Fiber optic distributed temperature sensors (FODTS), based on Brillouin and Raman scattering, have been successfully used in various applications such as fire detection, petroleum pipeline leakage detection, and concrete dam crack monitoring. In recent years, FODTS have been used to monitor the seepage of reservoirs, earth dams, water channels, embankments, tunnels, and levees. Unlike other applications, monitoring the seepage of these structures involves acquiring, processing, and analyzing the temperature information of porous media that are mainly rocks and soils. Detailed studies on the thermal interaction among rocks/soils, water, and optic fibers are essential to improve judgment on the occurrence of seepage and explore the possibility of quantifying the seepage rate. This paper describes a large-scale experimental study that investigated the thermal interaction. The study was carried out on three different soils (i.e., poorly graded gravel, poorly graded sand, and silty sand) in both non-seepage and seepage conditions. The effects of soil types, moisture content, seepage rates, and heat source powers on temperature changes were assessed in this study. It was found that, with a heat source, FODTS could effectively detect seepage under most circumstances. The temperature change differs in different soils. For all the soils investigated, the moisture content and the heat power showed significant influence on the temperature change. The seepage rate has insignificant influence on temperature change.

Download or read book Applied Mechanics Reviews written by and published by . This book was released on 1997 with total page 1060 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book International Conference on Multi disciplinary Technologies and challenges in Industry 4 0 written by Dr. Prakash s, dr. Silvia liberataullo, dr. Yogesh g s, dr. I manimozhi, prof. Shilpa patil. and published by Archers & Elevators Publishing House. This book was released on with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Scientific and Technical Aerospace Reports written by and published by . This book was released on 1995 with total page 700 pages. Available in PDF, EPUB and Kindle. Book excerpt: Lists citations with abstracts for aerospace related reports obtained from world wide sources and announces documents that have recently been entered into the NASA Scientific and Technical Information Database.

Download or read book Advanced Experimental Unsaturated Soil Mechanics written by Alessandro Tarantino and published by CRC Press. This book was released on 2005-07-14 with total page 590 pages. Available in PDF, EPUB and Kindle. Book excerpt: The field of experimental unsaturated soil mechanics has grown considerably over the last decade. In the laboratory and in the field, innovative techniques have been introduced into mechanical, hydraulic, and geo-environmental testing. Normally, this information is widely dispersed throughout journals and conference proceedings and it is often difficult to identify suitable equipment and instrumentation for research or professional purposes. In this volume, however, the authors bring together the latest research in laboratory and field testing techniques, and the equipment employed, and examine the current state-of-the-art in a forum devoted solely to experimental unsaturated soil mechanics. The papers published in the proceedings were peer-reviewed by internationally-recognized researchers. The topics tackled by the papers include suction measurement, suction control, mechanical and hydraulic laboratory testing, geo-environmental testing, and field-testing.

Download or read book Development of Fiber Optic Sensors for Measuring Pore Water Pressures written by Paul John Cosentino and published by . This book was released on 1994 with total page 156 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Advances in Agronomy written by and published by Academic Press. This book was released on 2018-02-14 with total page 308 pages. Available in PDF, EPUB and Kindle. Book excerpt: Advances in Agronomy continues to be recognized as a leading reference and first-rate source for the latest research in agronomy. Each volume contains an eclectic group of reviews by leading scientists throughout the world. As always, the subjects covered are rich, varied, and exemplary of the abundant subject matter addressed by this long-running serial. - Includes numerous, timely, state-of-the-art reviews on the latest advancements in agronomy - Features distinguished, well recognized authors from around the world - Builds upon this venerable and iconic review series - Covers the extensive variety and breadth of subject matter in the crop and soil sciences