Journal ArticleDOI
3D finite difference modeling of controlled-source electromagnetic response in frequency domain based on a modified curl-curl equation
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TLDR
A 3D finite difference CSEM modeling algorithm based on a modified version of the curl-curl equations with scaled grad-div operator (CCGD) in frequency domain and the results indicate that the proposed CCGD approach is efficient and stable over different frequencies.About:
This article is published in Journal of Applied Geophysics.The article was published on 2020-12-01. It has received 7 citations till now. The article focuses on the topics: Finite difference & Frequency domain.read more
Citations
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Journal ArticleDOI
Efficient Filter Generation Based on Particle Swarm Optimization Algorithm
TL;DR: In this article, a particle swarm algorithm was applied to optimize the spacing and shift in the model space, and the results indicate that the proposed 201-point filters have a good numerical performance in terms of accuracy over a large offset range.
Journal ArticleDOI
Extension of the regularization technique to controlled-source electromagnetic modeling in general anisotropic conductivity media
TL;DR: In this paper , the authors developed an efficient regularization technique to carry out the forward modeling of the anisotropic effect for 3D controlled-source electromagnetic data by explicitly including the gradient of a scaled divergence correction term into the original curl-curl equation.
Journal ArticleDOI
Fast Method for Accelerating Time-Domain Solutions of Ill-Conditioned Electromagnetic Problems by Changing Curl–Curl Operator to Laplacian
TL;DR: In this article, the authors analytically decompose the discretized curl-curl operator into a gradient divergence operator and a Laplacian without numerical computation, and further split the field solution into a curl-free component and a divergence-free one to take advantage of the decomposition.
Proceedings ArticleDOI
Remote Field Eddy Current System Using Three Axis Fluxgate Magnetometer for Corrosion Inspection
M. Khater,Tarek M. Mostafa,Guang An Ooi,Mehmet Burak Ozakin,Mohamed Larbi Zeghlache,Hakan Bagci,Shehab E. Ahmed +6 more
TL;DR: In this article , a three-axis fluxgate magnetometer is used as a receiver to increase the sensitivity and to enable extraction of directional location of defect from measurements taken off axis.
Journal ArticleDOI
Three-Dimensional Modeling of Marine Controlled Source Electromagnetic Using a New High-Order Finite Element Method With an Absorption Boundary Condition
TL;DR: In this article , a high-precision forward algorithm for 3-D modeling for MCSEM is proposed, where unstructured meshes are used to discretize the model domain, and local mesh refinement techniques are applied, which is conducive to simulating complex terrains and targets.
References
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Journal ArticleDOI
Numerical solution of initial boundary value problems involving maxwell's equations in isotropic media
Abstract: Maxwell's equations are replaced by a set of finite difference equations. It is shown that if one chooses the field points appropriately, the set of finite difference equations is applicable for a boundary condition involving perfectly conducting surfaces. An example is given of the scattering of an electromagnetic pulse by a perfectly conducting cylinder.
Book
Iterative Methods for Sparse Linear Systems
TL;DR: This chapter discusses methods related to the normal equations of linear algebra, and some of the techniques used in this chapter were derived from previous chapters of this book.
Book
Numerical Techniques in Electromagnetics, Second Edition
TL;DR: Numerical Techniques in Electromagnetics is designed to show the reader how to pose, numerically analyze, and solve electromagnetic (EM) problems using a variety of available numerical methods.
Journal ArticleDOI
Computational recipes for electromagnetic inverse problems
Gary D. Egbert,Anna Kelbert +1 more
TL;DR: In this paper, a general mathematical framework for Jacobian computations arising in electromagnetic (EM) geophysical inverse problems is developed, which is based on the discrete formulation of the forward problem and divides computations into components (data functionals, forward and adjoint solvers, model parameter mappings).
Journal ArticleDOI
Sea Bed Logging (SBL), a new method for remote and direct identification of hydrocarbon filled layers in deepwater areas
T. Eidesmo,S. Ellingsrud,Lucy MacGregor,Steven Constable,Martin Sinha,Stale Johansen,F. N. Kong,Harald Westerdahl +7 more
TL;DR: In this article, a technique called Sea Bed Logging (SBL) is described, which can be applied to detect and characterize hydrocarbon bearing reservoirs in deep water areas using CSEM sounding.