Electromagnetic Field Measurements in the Near Field PDF Download
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Author: Hubert Trzaska
Publisher: Noble Publishing
ISBN: 9781884932106
Category : Science
Languages : en
Pages : 219
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Book Description
In this book, internationally respected EMF measurement expert Hubert Trzaska discusses the specific problems of EMF measurements in the near field and the main factors limiting measurement accuracy. In light of the growing public and professional concern over the intensity of these fields and their potential health risks, Trzaska describes methods that provide accurate data to aid the development of new, improved standards. Measuring methods are examined for electromagnetic fields (EMF), electric fields and magnetic fields; measurement discussions include power density and photonic EMF measurements. Contents: The Principles of Near-Field EMF Measurements; EMF Measurement Methods; Electric Field Measurement; Magnetic Field Measurement; Power Density Measurement; Directional Pattern Synthesis; Other Factors Limiting Measurement Accuracy; Photonic EMF Measurements.
Author: Hubert Trzaska
Publisher: Noble Publishing
ISBN: 9781884932106
Category : Science
Languages : en
Pages : 219
Get Book Here
Book Description
In this book, internationally respected EMF measurement expert Hubert Trzaska discusses the specific problems of EMF measurements in the near field and the main factors limiting measurement accuracy. In light of the growing public and professional concern over the intensity of these fields and their potential health risks, Trzaska describes methods that provide accurate data to aid the development of new, improved standards. Measuring methods are examined for electromagnetic fields (EMF), electric fields and magnetic fields; measurement discussions include power density and photonic EMF measurements. Contents: The Principles of Near-Field EMF Measurements; EMF Measurement Methods; Electric Field Measurement; Magnetic Field Measurement; Power Density Measurement; Directional Pattern Synthesis; Other Factors Limiting Measurement Accuracy; Photonic EMF Measurements.
Author: Pawel Bienkowski
Publisher: IET
ISBN: 1891121065
Category : Science
Languages : en
Pages : 231
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Book Description
This book is devoted to the specific problems of electromagnetic field (EMF) measurements in the near field and to the analysis of the main factors which impede accuracy in these measurements. It focuses on careful and accurate design of systems to measure in the near field based on a thorough understanding of the fundamental engineering principles and on an analysis of the likely system errors. Beginning with a short introduction to electromagnetic fields with an emphasis on the near field, it then presents methods of EMF measurements in near field conditions. It details the factors limiting measurement accuracy including internal ones (thermal stability, frequency response, dynamic characteristics, susceptibility) and external ones (field integration, mutual couplings between a probe and primary and secondary EMF sources, directional pattern deformations). It continues with a discussion on how to gauge the parameters declared by an EMF meter manufacturer and simple methods for testing these parameters. It also details how designers of measuring equipment can reconsider the near field when designing and testing, as well as how users can exploit the knowledge within the book to ensure their tests and results contain the most accurate measurements possible. The SciTech Publishing Series on Electromagnetic Compatibility provides a continuously growing body of knowledge in the latest development and best practices in electromagnetic compatibility engineering. This series provides specialist and non-specialist professionals and students practical knowledge that is thoroughly grounded in relevant theory.
Author: Jesper E. Hansen
Publisher: IET
ISBN: 9780863411106
Category : Technology & Engineering
Languages : en
Pages : 408
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Book Description
This book describes the aspects of antenna test ranges, data processing schemes and measurement schemes.
Author: Stuart Gregson
Publisher: IET
ISBN: 0863417361
Category : Technology & Engineering
Languages : en
Pages : 413
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Book Description
This single volume provides a comprehensive introduction and explanation of both the theory and practice of 'Planar Near-Field Antenna Measurement' from its basic postulates and assumptions, to the intricacies of its deployment in complex and demanding measurement scenarios. To do this the book initially examines the properties of antennas that allow them to enhance the free space interaction of electronic systems and this leads into a full description of the theory of 'Planar Near-Field Scanning'.
Author: National Research Council
Publisher: National Academies Press
ISBN: 0309055903
Category : Political Science
Languages : en
Pages : 177
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Book Description
The U.S. Navy established an ecological monitoring program to determine whether electric and magnetic fields from extremely low frequency (ELF) communications systems influenced plant and animal populations near the transmitting facilities. Although some of the researchers believe that a few biological changes might have occurred, they concluded that the results do not indicate significant adverse ecological effects. This book evaluates the 11 ecological studies of the Navy's monitoring program and examines the adequacy of experimental design, the data collection and analysis, and the soundness of the conclusions. It also addresses whether the monitoring program was capable of detecting subtle effects due to ELF exposure and examines the biological changes observed by some program researchers, such as enhanced tree growth.
Author: Richard Orin Cornett
Publisher:
ISBN:
Category : Electric waves
Languages : en
Pages : 90
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Book Description
Author: Paul S. Ruggera
Publisher:
ISBN:
Category : Calibration
Languages : en
Pages : 36
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Book Description
Author: Thorkild B. Hansen
Publisher: John Wiley & Sons
ISBN: 0780334280
Category : Science
Languages : en
Pages : 402
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Book Description
"This invaluable book provides a comprehensive framework for the formulation and solution ofnumerous problems involving the radiation, reception, propagation, and scattering of electromagnetic and acoustic waves. Filled with original derivations and theorems, it includes the first rigorous development of plane-wave expansions for time-domain electromagnetic and acoustic fields. For the past 35 years, near-field measurement techniques have been confined to the frequency domain. Now, with the publication of this book, probe-corrected near-field measurement techniques have been extended to ultra-wide-band, short-pulse transmitting and receiving antennas and transducers. By combining unencumbered straightforward derivations with in-depth expositions of prerequisite material, the authors have created an invaluable resource for research scientists and engineers in electromagnetics and acoustics, and a definitive reference on plane-wave expansions and near-field measurements. Featured topics include: * An introduction to the basic electromagnetic and acoustic field equations * A rigorous development of time-domain and frequency-domain plane-wave representations * The formulation of time-domain, frequency-domain, and static planar near-field measurement techniques with and without probe-correction * Sampling theorems and computation schemes for time-domain and frequency-domain fields * Analytic-signal formulas that simplify the formulation and analysis of transient fields * Wave phenomena, such as ``electromagnetic missiles"" encountered only in the time domain * Definitive force and power relations for electromagnetic and acoustic fields and sources." Sponsored by: IEEE Antennas and Propagation Society.
Author:
Publisher:
ISBN:
Category :
Languages : en
Pages : 35
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Book Description
Electromagnetic (EM) field measurements were obtained near a single-stage reconnection gun accelerating a 194-gm, 4 x 4.5 x 1/4 in. aluminum plate. This type of EM launcher is of interest as an alternative for using explosive charges to launch a plate in the edge-on orientation. Electric and magnetic field measurements were designed to characterize the transient EM environment (EME) external to this capacitor-based EM launch system. The available data are included and selected data are discussed to illustrate the time history and spatial variation of the measured EME. The early time EM fields associated with this system are directly related to the coil current, but under operational conditions there is a late-time electric field associated with the induced eddy currents in the plate. This report summarizes progress to date in characterizing this EME in terms of the relevant system parameters such as coil current and plate velocity.
Author: Vadim Serafimovich Kalashnikov
Publisher: Springer Nature
ISBN: 981336436X
Category : Technology & Engineering
Languages : en
Pages : 163
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Book Description
This book is useful both for those who want to get initial information on the measurement of the antenna parameters, and for specialists directly involved in the experimental determination of the antenna parameters from the results of measuring the amplitude-phase distribution in the near zone of the antennas. Currently, the near-field method is the most common one for antenna measurements. In most books, an academic approach is given to the issue under consideration and it is difficult to use them for the direct organization of measurements. In many others, specific narrow issues are considered that are accessible to understanding only by highly qualified engineers/readers. The purpose of this book is to get rid of the above disadvantages by offering the reader a more accessible exposition and formulas by which appropriate computer programs can be written with minimal effort. The contents of this book allow interested specialists to be not only users of the near-field measuring facilities, but also help in understanding the principles of their work. This book is intended for engineers and specialists whose activities are related to experimental testing of radio characteristics of complex antenna systems, especially near-field measurements, and is also useful as a textbook for senior students in the field of “radioelectronics” and “radiophysics.”
