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Sensitivity functions of transient electromagnetic methods
Geophysics, 2014ABSTRACT Any geophysical measurement is a filter through which the distribution of a certain physical parameter in the subsurface is seen, and the sensitivity function is a characteristic of the method that reveals the nature of this filter.
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Electromagnetic transient numerical integration methods
2010 8th World Congress on Intelligent Control and Automation, 2010Electromagnetic transient simulation usually adopts numerical integration methods to solve algebraic or differential, partial differential equations. The electromagnetic transient simulation numerical integration methods include Trapezoidal, Backward Euler, Forward Euler, Simpson and Gear second order.
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Frequency Domain Methods for Electromagnetic Transient Analysis
2007 IEEE Power Engineering Society General Meeting, 2007Frequency domain methods are invaluable as complements to the time domain ones to analyze electromagnetic transients in power systems. This paper presents an overview of those frequency domain methods most commonly used in this analysis; namely, the Fourier transform, the Laplace transform and the Z-transform.
J. L. Naredo +4 more
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The dual loop configuration of the transient electromagnetic method
Geophysics, 1975Abstract The transient electromagnetic method offers considerable advantages over conventional electromagnetic systems; these advantages make the method attractive under typical Australian conditions of conductive overburden. A common transient electromagnetic ground system used in Australia is a combined loop version in which the ...
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Parallel DGTD method for transient electromagnetic problems
2018 IEEE International Symposium on Electromagnetic Compatibility and 2018 IEEE Asia-Pacific Symposium on Electromagnetic Compatibility (EMC/APEMC), 2018In this paper, a parallel discontinuous Galerkin time-domain (DGTD) method is developed for transient electromagnetic (EM) problems. In this method, the excitation is introduced by sorts of plane wave through total field/scattered field (TF/SF) boundary condition, and perfect matching layer (PML) is used to enhance reflected wave absorption.
Haoqing Chen +4 more
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Characterization of lake beds with the transient electromagnetic method
2020In the course of this thesis, transient electromagnetic (TEM) measurements were carried out on lakes. The aim of these measurements was to determine the geometry of the water bottom and the electrical resistivity of the water and the underlying geological layers. A buoyant ring was built for the application of TEM on the surface of the lakes. The cable
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Computational methods in transient electromagnetics. A selective survey
IEEE Computational Science and Engineering, 1994We can now solve real-life problems in electromagnetics at all levels of complexity. Several popular algorithms are available to deal with the transient-scattering problem. They all solve either differential or integral equations in one form or another. No one method is best in all situations.
G.K. Gothard, D.A. Vechinski, S.M. Rao
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A simple method of transient electromagnetic data analysis
Geophysics, 1998Abstract Time-domain or transient electromagnetic (TEM) methods are used routinely in environmental, hydrogeological, energy, and mineral resources investigations owing to their ease of use and ability to generate diagnostic data. In some typical field situations, the gross structure of the subsurface may be approximately 1-D, so 1-D ...
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The Probing Depth of Transient Electromagnetic Field Method
Chinese Journal of Geophysics, 2009AbstractTaking central loop configuration excited by a step pulse on the ground as an example, we study the probing depth of electromagnetic sounding with analytical method, finite difference time domain and timefrequency methods. The aim is to provide a basis for field work design in order to reach the expected target.
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