Relevant bibliographies by topics / Eddy currents

Academic literature on the topic 'Eddy currents'

Author: Grafiati
Published: 4 June 2021
Last updated: 1 June 2024

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Journal articles on the topic "Eddy currents"

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González, Manuel I. "Experiments with eddy currents: the eddy current brake." European Journal of Physics 25, no. 4 (April 22, 2004): 463–68. http://dx.doi.org/10.1088/0143-0807/25/4/001.

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Hilborn, Robert C. "Eddy currents." Physics Teacher 52, no. 4 (April 2014): 197. http://dx.doi.org/10.1119/1.4868926.

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Xu, Zheng, Jiamin Wu, Lu Li, Yucheng He, Wei He, and Dengjie Yu. "Fast analytical calculation method for eddy current induced by gradient fields in an MRI system." COMPEL - The international journal for computation and mathematics in electrical and electronic engineering 36, no. 6 (November 6, 2017): 1690–705. http://dx.doi.org/10.1108/compel-12-2016-0566.

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Purpose Eddy currents are inevitable in magnetic resonance imaging (MRI) systems. These currents are mainly induced by gradient fields. This study aims to propose a fast analytical method to calculate eddy currents induced by frequently switching gradient fields in a traditional C-shape MRI system. Design/methodology/approach Fourier decomposition and magnetic vector potentials were used to calculate the eddy currents. Calculations with the proposed analytical method revealed the spatial distribution and temporal evolution of eddy currents. Findings Calculation and Maxwell simulation results were consistent. The agreement between calculation and simulation results indicates that increasingly sophisticated structures could be developed. The calculated results could guide the design of improved gradient coils. Originality/value Eddy currents induced by gradient current are decomposed into currents induced by each time-harmonic component, and then adding them together to obtain complete contribution of the eddy current. The analytical method was used to characterize the properties of symmetric and asymmetric eddy currents induced by gradient coils in MRI systems. The analytical method can be used to improve the gradient shield during the design of the gradient coil in the MRI system.
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Konrad, A. "Eddy currents and modelling." IEEE Transactions on Magnetics 21, no. 5 (September 1985): 1805–10. http://dx.doi.org/10.1109/tmag.1985.1063928.

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Iyer, R., J. Millhollon, and K. Long. "Micromagnetics with eddy currents." Journal of Physics: Conference Series 268 (January 1, 2011): 012011. http://dx.doi.org/10.1088/1742-6596/268/1/012011.

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Cessi, Paola, and Christopher L. Wolfe. "Adiabatic Eastern Boundary Currents." Journal of Physical Oceanography 43, no. 6 (June 1, 2013): 1127–49. http://dx.doi.org/10.1175/jpo-d-12-0211.1.

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Abstract The dynamics of the eastern boundary current of a high-resolution, idealized model of oceanic circulation are analyzed and interpreted in terms of residual mean theory. In this framework, it is clear that the eastern boundary current is adiabatic and inviscid. Nevertheless, the time-averaged potential vorticity is not conserved along averaged streamlines because of the divergence of Eliassen–Palm fluxes, associated with buoyancy and momentum eddy fluxes. In particular, eddy fluxes of buoyancy completely cancel the mean downwelling or upwelling, so that there is no net diapycnal residual transport. The eddy momentum flux acts like a drag on the mean velocity, opposing the acceleration from the eddy buoyancy flux: in the potential vorticity budget this results in a balance between the divergences of eddy relative vorticity and buoyancy fluxes, which leads to a baroclinic eastern boundary current whose horizontal scale is the Rossby deformation radius and whose vertical extent depends on the eddy buoyancy transport, the Coriolis parameter, and the mean surface buoyancy distribution.
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Simm, A., and G. Y. Tian. "EDDY CURRENTS: Investigation of directional eddy current complex measurements for defect mapping." Insight - Non-Destructive Testing and Condition Monitoring 52, no. 6 (June 1, 2010): 320–25. http://dx.doi.org/10.1784/insi.2010.52.6.320.

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Dziczkowski, Leszek, and Sławomir Zolkiewski. "Determination of the Penetration Depth of Eddy Currents in Defectoscopic Tests." Key Engineering Materials 588 (October 2013): 64–73. http://dx.doi.org/10.4028/www.scientific.net/kem.588.64.

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In the defectoscopic tests by means of the eddy currents method only a certain superficial layer of the tested element is inspected. The reason of this phenomenon is connected with a very important feature of the eddy currents. The induced eddy currents generate its own magnetic field which obstructs penetration for the primary magnetic field. It is crucial to know the penetration depth of eddy currents. It allows planning successfully the diagnosis process. There are two cases worth mentioning: when the eddy current method is treated as the additional method complementary to the ultrasound method (because it does not detect superficial defects) and when the eddy current method is used as the main method for the thin elements diagnosis. The most frequently used evaluation method of eddy currents penetration depth is connected with determination of the e-folding decrease of electric current. The definition is convenient to use because it is simplified by using in the mathematical formula (allowing determination of the depth) frequency of eddy current and conductivity of the diagnosed elements. However the simplifications are not sufficient in practice. When we change the frequency of eddy currents during the survey or the probe then the depth of penetration is also changed, then we can measure the depth of the defects. While measuring the conductivity of a proper material element it is obligatory to prepare an adequate size of the sample that is free of defects. Knowing the value of penetration depth is then very helpful. On the other hand, when we have a sample of a specified size and we want to measure its conductivity then the knowledge of the depth of penetration of eddy currents helps us to select the proper frequency. In the paper there is described a proposal of a different definition of the penetration depth of eddy current, much more useful and accurate according to the authors. To obtain much more precise results, the new eddy current method was proposed. This method takes into account not only the parameters of the diagnosed sample and the eddy current frequency but the characteristic of the measuring device as well. The above mentioned method is based on the universal mathematical model of impact of conductive thin foil on the measuring coil impedance change. The procedure of calculations is easy to carry out online.
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Locci, N., and C. Muscas. "Hysteresis and eddy currents compensation in current transformers." IEEE Transactions on Power Delivery 16, no. 2 (April 2001): 154–59. http://dx.doi.org/10.1109/61.915475.

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Tsiapla, Aikaterini-Rafailia, Konstantinos Angelou, and Mavroeidis Angelakeris. "Magnetically driven treatments: optimizing performance by mitigation of eddy currents." Nanomedicine 16, no. 11 (May 2021): 895–907. http://dx.doi.org/10.2217/nnm-2020-0383.

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Aim: In this work, we study the eddy current evolution naturally occurring in magnetically driven treatments, such as MRI and magnetic particle hyperthermia (MPH), and propose the mitigation of eddy currents by careful control of field parameters. Materials & methods: We start by simulation of typical MRI and MPH experimental setups to witness eddy currents and then we examine experimentally how field parameters (frequency, amplitude and pulse duration) mitigate eddy currents in a typical MPH treatment. Results and conclusion: By tuning the frequency, the amplitude and by applying pulsed field mode, we successfully attenuate undesirable heating, due to eddy currents’ evolution, on surrounding healthy tissues without sparing beneficial effect within the malignant region, thus treatment remains reliable yet with milder side effects.
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Dissertations / Theses on the topic "Eddy currents"

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Belloufi, Messaoud. "Experimental studies of eddy currents." Thesis, Loughborough University, 1990. https://dspace.lboro.ac.uk/2134/12008.

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The thesis is mainly concerned with experimental studies of the heating effects of eddy currents. Sinusoidal and non-sinusoidal eddy current heating losses in non-magnetic conducting discs and spheres, subjected to a uniform field, are studied both theoretically and experimentally. The theory uses two different methods to calculate the power dissipation in the objects, and it employs Fourler series for the non-sinusoidal case. Some approximations for the losses at low frequency have been derived. The experimental study has three main sections. The first deals with the generation of uniform field for inducing eddy currents. Square Helmholtz coils have been designed, constructed and calibrated for this purpose. The second part is concerned with the measurement of the heat generated by eddy currents. A differential thermometer, using two matched therrnistors in a Blumlein bridge circuit, has been designed, built and calibrated. Operating close to balance, with a phase sensitive detector, the thermometer detects differences of 10-5 degrees C. In the third part, the experiment arranged for the eddy current heating measurements is described. The measured and the calculated results are compared, and the agreement was found to be about 2%. In foil wound inductors excited by alternating current, eddy currents together with proximity effect cause a redistribution of the current density across the width of the inductors. The current flow is increased along the edges of the foil and decreased along the centre portion. A thermal demonstration of this phenomenon, which is known as width effect, is described and studied by using the differential thermometer.
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Giguere, Sylvain. "Pulsed eddy-currents for corrosion detection." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1999. http://www.collectionscanada.ca/obj/s4/f2/dsk3/ftp04/mq44910.pdf.

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Ortiz, Gomez Natalia. "Eddy currents applied to space debris objects." Thesis, University of Southampton, 2017. https://eprints.soton.ac.uk/415734/.

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The increasing population of space debris in the near-Earth region poses a serious threat to operational satellites in-orbit. This situation has led to the development of numerous guidelines in order to mitigate the potential danger of in-orbit collisions, fragmentations and uncontrolled re-entries. Among the various recommendations, active debris removal is considered as a possible solution to help decrease the chance of the aforementioned risks. However, active debris removal has never been done in space and it still requires further development of various technologies and orbit testing before it can become a reality. One of the major challenges to overcome is how to capture rotating space debris objects. Some of these objects may have high rotational speeds which hampers their capture and subsequent controlled re-entry. This research focuses on the analysis of the eddy current phenomenon on space debris objects by the Earth magnetic field as well as its practical application to develop a de-tumbling method for active debris removal based on the generation of eddy currents. The first part of the project focuses on the development of a new mathematical approach which generalises the existing analytical models and simplifies the numerical methods typically employed to analyse the eddy current phenomenon. This mathematical approach, referred to as the magnetic tensor theory, is validated both numerically and experimentally. The theory is based on the discovery of a symmetric Cartesian tensor of second order with no negative eigenvalues, named the magnetic tensor. A method to evaluate this tensor based on a generic finite element method is provided as well as a particularization for a specific F.E.M. which leads to a direct formula to evaluate this tensor. This way, the eddy current torque solution may be found without the necessity to solve the classical Poisson equation with Neumann boundary conditions in each time step of the integration process of Euler’s equation. This breakthrough greatly reduces the complexity and computational time of the classical approach commonly adopted in the past. The second part of the project focuses on the design of a contactless de-tumbling method based on the generation of eddy currents named the eddy brake method. This design delves deeper into the idea first suggested by Kadaba and Naishadham in 1995 which consists in subjecting a space debris object to an enhanced magnetic field in order to damp its rotation. The advances in high temperature superconducting materials as well as spacecraft sensors and actuators has allowed for a compelling new design to be reached within this research which may serve as a stepping stone for future ADR missions. A thorough systems engineering design of the eddy brake is presented with special attention to the thermal and guidance, navigation and control subsystems. These subsystems have been identified as the two most relevant ones to support the operation of the eddy brake. The results show that the eddy brake is a promising solution to reduce the rotation of metallic space debris and allow for their subsequent capture.
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Case, Russell. "REDUCING EDDY CURRENTS IN HIGH MAGNETIC FIELD ENVIRONMENTS." Master's thesis, University of Central Florida, 2008. http://digital.library.ucf.edu/cdm/ref/collection/ETD/id/4305.

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When an electrical conducting volume is placed into the bore of an MRI undergoing an image scan, time varying magnetic gradients induce eddy currents in this conducting material. These eddy currents in turn produce a mechanical torque on this volume. It is the goal of this thesis to produce a computer simulation of eddy currents produced by placing conducting materials inside an MRI bore. The first part of the thesis establishes the physics and principles behind an MRI system along with several applications. Next, this thesis presents an analysis of eddy current effects produced on a conductor placed into an MRI bore. The design and construction of simulated MRI magnetic fields is then presented along with a study of simulated eddy currents in various test conducting volumes of selected materials. Finally, techniques are discussed for reducing eddy currents in these conducting volumes and materials, along with simulation results showing the reduction in the applied eddy current. The findings of this thesis are summarized in the conclusions and recommendations are made for modification and future applications of these techniques and simulations.
M.S.E.E.
School of Electrical Engineering and Computer Science
Engineering and Computer Science
Electrical Engineering MSEE
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Carstensen, Christian. "Eddy currents in windings of switched reluctance machines." Aachen Shaker, 2007. http://d-nb.info/989018482/04.

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Wilson, Thomas Lawler. "A multi-coil magnetostrictive actuator." Diss., Atlanta, Ga. : Georgia Institute of Technology, 2009. http://hdl.handle.net/1853/28243.

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Thesis (M. S.)--Mechanical Engineering, Georgia Institute of Technology, 2009.
Committee Chair: Zinn, Ben T.; Committee Member: Book, Wayne; Committee Member: Glezer, Ari; Committee Member: Neumeier, Yedidia; Committee Member: Seitzman, Jerry.
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Benhama, Abdelkrim. "Investigation of losses in foil windings of inverter fed transformers operating at medium frequencies." Thesis, University of Salford, 1994. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.386448.

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Oaten, Susan Rosemary. "Assessment of defects in ferromagnetic metals with eddy currents." Thesis, Brunel University, 1989. http://bura.brunel.ac.uk/handle/2438/5310.

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A study was made to identify and size surface breaking defects in ferromagnetic materials with eddy currents, whilst eliminating unwanted signals due to changes in magnetic permeability and probe lift-off. The former was overcome by the use of high frequencies and the latter by utilising the lift-off to characterise the defects. The lift- off or "touch" method was shown to be advantageous in that one could test steel objects having irregular surfaces, such as occurring with the presence of welds. In addition a theoretical investigation was undertaken to relate changes in the magnetic permeability, electrical conductivity and values of lift-off to the components of impedance of a detecting coil located above the plane surface of a ferromagnetic metal. The resultant theory was confirmed by experimental measurements.
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FORTALEZA, LEONARDO GOUVEA E. SILVA. "NON-FERROMAGNETIC METALLIC FOREIGN BODY DETECTION BY EDDY CURRENTS." PONTIFÍCIA UNIVERSIDADE CATÓLICA DO RIO DE JANEIRO, 2016. http://www.maxwell.vrac.puc-rio.br/Busca_etds.php?strSecao=resultado&nrSeq=28358@1.

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PONTIFÍCIA UNIVERSIDADE CATÓLICA DO RIO DE JANEIRO
CONSELHO NACIONAL DE DESENVOLVIMENTO CIENTÍFICO E TECNOLÓGICO
Projéteis de chumbo (não-ferromagnéticos) são corpos estranhos comuns na prática médica. Métodos convencionais de localização utilizam radiações ionizantes, impondo riscos à saúde e procedimentos que duram várias horas e tipicamente terminam malsucedidos. Mapas de campos magnéticos obtidos não-invasivamente e inocuamente com SQUIDs beneficiam a localização de agulhas metálicas ferromagnéticas, reduzindo o tempo de remoção bem-sucedida de 6 horas para 10 minutos. SQUIDs são os magnetômetros mais sensíveis, entretanto requerem temperaturas criogênicas, levando a altos custos e baixa portabilidade que impedem a difusão do uso clínico. O objetivo é desenvolver um dispositivo para localizar corpos estranhos metálicos não-ferromagnéticos visando remoção cirúrgica, respeitando requerimentos de projeto: alta sensibilidade, inocuidade, não-invasividade, baixo custo, segurança, portabilidade, facilidade de uso e operação em temperatura ambiente. Sensores GMR e GMI são considerados alternativas mais adequadas. Modelos teóricos de eletrodinâmica clássica aplicados às correntes parasitas servem como base. Dois sistemas eletrônicos são desenvolvidos em configuração gradiométrica para remover interferência ambiente, usando elementos sensores GMR e GMI disponíveis comercialmente. O desempenho é obtido com resultados de simulações, provando a capacidade de detecção de níveis esperados de densidade de fluxo magnético para certos raios de projéteis e distâncias. O Sistema GMI é mais qualificado, sua mais alta sensibilidade e melhor resolução favorecem maiores faixas de medição, inocuidade, segurança e facilidade de uso. Os resultados demonstram a viabilidade dos elementos sensores GMI nessa aplicação. Os benefícios de baixo custo, maior portabilidade e segurança facilitam a utilização clínica de técnicas de localização para corpos estranhos metálicos não-ferromagnéticos mais inócuas e efetivas.
Lead projectiles (non-ferromagnetic) are common foreign bodies in the medical practice. Conventional means of location use ionizing radiation, pose health risks and lead to procedures that last several hours, typically ending unsuccessfully. Magnetic field maps obtained non-invasively and innocuously with SQUIDs benefit the location of ferromagnetic metallic needles, reducing the time of successful removal from 6 hours to 10 minutes. SQUIDs are currently the most sensitive magnetometers, however require cryogenic temperatures, leading to high cost and low portability which prevent widespread clinical use. The objective is to design a device for locating non-ferromagnetic metallic foreign bodies for surgical removal, respecting project requirements of: high sensitivity, innocuousness, non-invasiveness, low cost, safety, portability, ease of use and room temperature operation. GMR and GMI sensors are considered as more suitable alternatives. Classical electrodynamics theoretical models applied to eddy currents induction serve as framework. Two electronic location systems are developed in gradiometric configuration to remove environmental interference, using commercially available GMR and GMI sensor elements. System performance is obtained from simulation results, demonstrating the capability of detecting the magnetic flux density levels expected under certain projectile radii and distances. The GMI system is more qualified, as its higher sensitivity and improved resolution favors larger measurement ranges, innocuousness, safety and ease of use. The results prove the viability of using GMI sensor elements in this application. The benefits of lower cost, higher portability and safety facilitate the clinical use of more innocuous and effective location techniques for non-ferromagnetic metallic foreign bodies.
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Meuleners, Michael Joseph. "A numerical study of the mesoscale eddy dynamics of the Leeuwin Current system /." Connect to this title, 2005. http://theses.library.uwa.edu.au/adt-WU2007.0134.

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Books on the topic "Eddy currents"

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Krawczyk, Andrzej. Numerical modelling of eddy currents. Oxford: Clarendon Press, 1993.

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Bergman, John. Eddy currents in a conducting sphere. [Tempe, Ariz.?]: Arizona State University, 1987.

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1930-, Kriezis E. E., ed. Eddy currents in linear conducting media. Amsterdam: Elsevier, 1985.

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Rem, Peter C. Eddy current separation. Delft: Eburon, 1999.

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R, Albanese, and International Workshop on Electromagnetic Nondestructive Evaluation (3rd : 1997 : Reggio di Calabria, Italy), eds. Electromagnetic nondestructive evaluation (II). Amsterdam: IOS Press, 1998.

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Hagemaier, Donald J. Fundamentals of eddy current testing. Columbus, OH: American Society for Nondestructive Testing, 1990.

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Buch, Eric J. Wind-forced modeling studies of currents, meanders, eddies, and filaments of the Canary Current System. Monterey, Calif: Naval Postgraduate School, 1997.

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Touzani, Rachid, and Jacques Rappaz. Mathematical Models for Eddy Currents and Magnetostatics. Dordrecht: Springer Netherlands, 2014. http://dx.doi.org/10.1007/978-94-007-0202-8.

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Subbarao, V. Eddy Currents in Linear and Nonlinear Media. New Delhi, India: Omega Scientific Publishers, 1991.

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I, Hariharan S., Ida Nathan, and United States. National Aeronautics and Space Administration., eds. Solving time-dependent two-dimensional eddy current problems. [Washington, DC]: National Aeronautics and Space Administration, 1988.

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Book chapters on the topic "Eddy currents"

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Ferreira, J. A. "Eddy Currents in Conductors." In Electromagnetic Modelling of Power Electronic Converters, 49–65. Boston, MA: Springer US, 1989. http://dx.doi.org/10.1007/978-1-4757-2014-3_4.

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Bermúdez, Alfredo, Dolores Gómez, and Pilar Salgado. "The eddy currents model." In UNITEXT, 183–216. Cham: Springer International Publishing, 2014. http://dx.doi.org/10.1007/978-3-319-02949-8_10.

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Bermúdez, Alfredo, Dolores Gómez, and Pilar Salgado. "Eddy currents with MaxFEM." In UNITEXT, 325–45. Cham: Springer International Publishing, 2014. http://dx.doi.org/10.1007/978-3-319-02949-8_16.

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Mrozynski, Gerd, and Matthias Stallein. "Quasi Stationary Fields – Eddy Currents." In Electromagnetic Field Theory, 126–93. Wiesbaden: Vieweg+Teubner Verlag, 2012. http://dx.doi.org/10.1007/978-3-8348-2178-2_5.

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Podney, Walter. "Poetry to Pulsed Eddy Currents." In Review of Progress in Quantitative Nondestructive Evaluation, 493–500. Boston, MA: Springer US, 1999. http://dx.doi.org/10.1007/978-1-4615-4791-4_62.

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Dodd, C. V., and W. E. Deeds. "Multiparameter Methods with Pulsed Eddy Currents." In Review of Progress in Quantitative Nondestructive Evaluation, 849–54. Boston, MA: Springer US, 1987. http://dx.doi.org/10.1007/978-1-4613-1893-4_97.

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Iatcheva, Ilona I., Slavoljub R. Aleksic, and Rumene D. Stancheva. "Fictitious Magnetic Contours as Eddy Currents Exciter." In Studies in Computational Intelligence, 289–98. Berlin, Heidelberg: Springer Berlin Heidelberg, 2008. http://dx.doi.org/10.1007/978-3-540-78490-6_35.

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Esposti Ongaro, Tomaso, Sara Barsotti, Augusto Neri, and Maria Vittoria Salvetti. "Large-eddy simulation of pyroclastic density currents." In Quality and Reliability of Large-Eddy Simulations II, 161–70. Dordrecht: Springer Netherlands, 2011. http://dx.doi.org/10.1007/978-94-007-0231-8_15.

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Ward, William W., and John C. Moulder. "Low Frequency, Pulsed Eddy Currents for Deep Penetration." In Review of Progress in Quantitative Nondestructive Evaluation, 291–98. Boston, MA: Springer US, 1998. http://dx.doi.org/10.1007/978-1-4615-5339-7_37.

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Beissner, R. E. "Theory of Eddy Currents in Metal Matrix Composites." In Review of Progress in Quantitative Nondestructive Evaluation, 225–32. Boston, MA: Springer US, 1992. http://dx.doi.org/10.1007/978-1-4615-3344-3_28.

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Conference papers on the topic "Eddy currents"

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Feng-yan, Yi, and Yu Ming-jin. "Computation of 2D and 3D Eddy Currents of Eddy Current Retarders." In 2010 International Conference on Electrical and Control Engineering (ICECE). IEEE, 2010. http://dx.doi.org/10.1109/icece.2010.846.

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Rabinovici, Raul, Vadim Berdichevsky, and Moshe Shvartsas. "Eddy-currents levitation system." In 2012 IEEE 27th Convention of Electrical & Electronics Engineers in Israel (IEEEI 2012). IEEE, 2012. http://dx.doi.org/10.1109/eeei.2012.6377036.

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Radtke, Uwe, Horst-Artur Crostack, and M. Maass. "Detection of eddy currents with a new laser-supported eddy current sensor." In Lasers and Optics in Manufacturing III, edited by Christophe Gorecki. SPIE, 1997. http://dx.doi.org/10.1117/12.281180.

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Gogola, Daniel, Andrej Krafčík, Ivan Frollo, and Pavol Szomolányi. "Eddy Currents Compensation in MRI." In 2023 14th International Conference on Measurement. IEEE, 2023. http://dx.doi.org/10.23919/measurement59122.2023.10164524.

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Honda, Satoshi, and Tomoshige Yamamoto. "Electro-Magnetic Flowmeters Using Eddy Currents." In 2006 SICE-ICASE International Joint Conference. IEEE, 2006. http://dx.doi.org/10.1109/sice.2006.315180.

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Sharma, Kush K., Sohaib Ghazali, Animesh Dalai, Keshav Sarawat, Vindhya Devalla, Sudhir Joshi, Surajit Mondal, and Prashant Rawat. "Space Debris reduction using Eddy Currents." In 2018 Atmospheric Flight Mechanics Conference. Reston, Virginia: American Institute of Aeronautics and Astronautics, 2018. http://dx.doi.org/10.2514/6.2018-3161.

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Etcheverry, Javier I., and Daniel H. Ziella. "Eddy currents benchmark analysis with COMSOL." In 40TH ANNUAL REVIEW OF PROGRESS IN QUANTITATIVE NONDESTRUCTIVE EVALUATION: Incorporating the 10th International Conference on Barkhausen Noise and Micromagnetic Testing. AIP Publishing LLC, 2014. http://dx.doi.org/10.1063/1.4865084.

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Cooper, Cortis K., and James B. Stear. "Estimating Design Currents During Joint Eddy-TRWs and Joint Eddy-Hurricanes." In Offshore Technology Conference. Offshore Technology Conference, 2009. http://dx.doi.org/10.4043/19985-ms.

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Dufour, Stephane, and Gerard Vinsard. "Eddy currents in cusp shaped thin shell." In 2016 IEEE Conference on Electromagnetic Field Computation (CEFC). IEEE, 2016. http://dx.doi.org/10.1109/cefc.2016.7815938.

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Fizek, Sebastian, Martin Reisinger, Siegfried Silber, and Wolfgang Amrhein. "A hybrid solenoid model comprising eddy currents." In 2014 International Symposium on Power Electronics, Electrical Drives, Automation and Motion (SPEEDAM 2014). IEEE, 2014. http://dx.doi.org/10.1109/speedam.2014.6871918.

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Reports on the topic "Eddy currents"

1

Morgan, G. Magnet lamination eddy currents reexamined. Office of Scientific and Technical Information (OSTI), November 1986. http://dx.doi.org/10.2172/1150448.

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2

Claus, J. EDDY CURRENTS IN BOOSTER VACUUM CHAMBERS. Office of Scientific and Technical Information (OSTI), March 1986. http://dx.doi.org/10.2172/1150402.

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Morgan, G., and S. Kahn. Calculation of Eddy Currents in the Beam Tube. Office of Scientific and Technical Information (OSTI), January 1986. http://dx.doi.org/10.2172/1150386.

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4

Feltman, A., J. Funaro, L. Ratner, W. van Asselt, and P. Yamin. EDDY CURRENTS IN THE TRANSITION JUMP QUADRUPOLE VACUUM CHAMBERS. Office of Scientific and Technical Information (OSTI), November 1989. http://dx.doi.org/10.2172/1151239.

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5

Reichert, Heidi. NONDESTRUCTIVE EVALUATION OF SMALL-DIAMETER BRAZED JOINTS USING EDDY CURRENTS. Office of Scientific and Technical Information (OSTI), December 2019. http://dx.doi.org/10.2172/1577995.

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Morgan G. H. Temperature rise in the vacuum chamber due to eddy currents. Office of Scientific and Technical Information (OSTI), July 1986. http://dx.doi.org/10.2172/1150431.

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7

Bruce and Fiore. L51629 Users Manual-Field Validation of the Low-Frequency Eddy Current Instrument-Software Listings. Chantilly, Virginia: Pipeline Research Council International, Inc. (PRCI), October 1990. http://dx.doi.org/10.55274/r0010602.

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Abstract:
When an eddy current probe is placed near a conductive material, the alternating magnetic field from the probe causes electrical currents to flow in the material. These currents have associated with them their own magnetic field, which opposes the original magnetic field from the coil. The result is that the impedance of the probe is greatly reduced by the presence of the conducting material. If the conductor is also magnetic, as is normal steel, the situation is similar though slightly more complicated. Here, the impedance of the probe may be either increased or decreased depending on the permeability of the material and the frequency of the alternating field. Anything that affects the flow of current in the conductive material will also affect the impedance of the eddy current probe. For example, the electrical currents cannot flow through a crack but must flow around it. The alteration in the currents also changes the magnetic field produced by the currents and, consequently, the impedance of the probe. Normally, the impedance change caused by a defect is much smaller than that caused by the presence of the material in the first place, and measuring this small change requires a bridge circuit much like the balanced bridge used with strain gauges. The balanced bridge allows one to amplify the small changes in impedance caused by defects in the presence of the much larger change caused by the presence of the conductive and magnetic pipeline steel. The LFEC instrument is constructed using an� IBM-AT compatible portable computer. Inside the PAC-386 are two plug-in circuit cards that turn the PAC-386 into an eddy current instrument. The first, also commercially available, is a Spectrum DSP56000 digital signal processing card, while the second is a specially-built interface card for the eddy current probe. The PAC-386 is a standard MS-DOS machine and will operate most MS-DOS software. In the discussion below, it is assumed that the user is familiar with the MSDOS operating system.
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Hayford. L51566 Ultralow Frequency Eddy Current Instrument for the Detection and Sizing of Stress Corrosion Cracks. Chantilly, Virginia: Pipeline Research Council International, Inc. (PRCI), January 1988. http://dx.doi.org/10.55274/r0010601.

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Eddy current testing has received only limited application to ferrous materials because the high permeability of the material in combination with the normally high frequency of the eddy current instrument results in a very small depth of penetration of the eddy currents into the material. The objectives of this research program were threefold. The first goal was to develop an eddy current instrument with frequencies low enough to penetrate pipeline steel. The second was to use the new instrument to develop techniques for locating stress corrosion cracks (SCC) on coated pipelines without requiring the removal of the coating. Our last goal was to develop methods of characterizing SCC; i.e. determining the lengths and depths of the defects.
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Poulain, Pierre-Marie. Dynamics of Localized Currents and Eddy Variability in the Adriatic (DOLCEVITA). Fort Belvoir, VA: Defense Technical Information Center, September 2003. http://dx.doi.org/10.21236/ada629114.

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10

DeLucia, J. Eddy currents in a nonperiodic vacuum vessel induced by axisymmetric plasma motion. Office of Scientific and Technical Information (OSTI), December 1985. http://dx.doi.org/10.2172/6414521.

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