3-D imaging of large scale buried structure by 1-D inversion of very early time electromagnetic (VETEM) data

Aydiner, Alaeddin; Chew, W. C.; Cui, Tie Jun; Wright, David L.; Smith, David V.; Abraham, Jared D.

doi:10.1109/36.927454

Cited by 13 publications

(10 citation statements)

References 21 publications

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“…We just move the cart to measure the scattered fields at different transmitter-receiver locations. Therefore, the measurement system is easily set up for the multiple-frequency DBIM algorithm [38] and the measurement is easily achieved. However, two object functions, the permittivity profile and conductivity profile, have to be reconstructed since the frequency is changing in the algorithm.…”

Section: Multiple-frequency Distorted Born Iterative Methodsmentioning

confidence: 99%

Enhancements to and Characterization of the Very Early Time Electromagnetic (VETEM) Prototype Instrument and Applications to Shallow Subsurface Imaging at Sites in the DOE Complex - Final Report

Wright¹,

Chew²

2000

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Section: Multiple-frequency Distorted Born Iterative Methodsmentioning

confidence: 99%

Enhancements to and Characterization of the Very Early Time Electromagnetic (VETEM) Prototype Instrument and Applications to Shallow Subsurface Imaging at Sites in the DOE Complex - Final Report

Wright¹,

Chew²

2000

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“…Using the following relationship: or (18) the tilt angle shown in Fig. 1 is easily determined, where can be obtained by the magnetostatics [31]. Besides the primary field due to direct coupling of transmitter and receiver, the measurement data also contain the reflected field from the air-earth interface, which should be removed from the total field to invert the buried structures.…”

Section: Preprocessing Of Real Datamentioning

confidence: 99%

“…Since the reflected field is dependent upon the earth conductivity , we have to estimate this parameter first. In [31], the earth conductivity has been measured experimentally by checking the very early time portion of VETEM waveforms. Although this method has been verified by simulations, it requires a calibration.…”

Section: Preprocessing Of Real Datamentioning

confidence: 99%

Three-dimensional imaging of buried objects in very lossy earth by inversion of VETEM data

Cui

Aydiner

Chew

et al. 2003

IEEE Trans. Geosci. Remote Sensing

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The very early time electromagnetic system (VETEM) is an efficient tool for the detection of buried objects in very lossy earth, which allows a deeper penetration depth compared to the ground-penetrating radar. In this paper, the inversion of VETEM data is investigated using three-dimensional (3-D) inverse scattering techniques, where multiple frequencies are applied in the frequency range from 0-5 MHz. For small and moderately sized problems, the Born approximation and/or the Born iterative method have been used with the aid of the singular value decomposition and/or the conjugate gradient method in solving the linearized integral equations. For large-scale problems, a localized 3-D inversion method based on the Born approximation has been proposed for the inversion of VETEM data over a large measurement domain. Ways to process and to calibrate the experimental VETEM data are discussed to capture the real physics of buried objects. Reconstruction examples using synthesized VETEM data and real-world VETEM data are given to test the validity and efficiency of the proposed approach.Index Terms-Buried objects, singular value decomposition (SVD), three-dimensional imaging, three-dimensional inversion, Tikhonov regularization, very lossy earth, very early time electromagnetic (VETEM) data.

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“…Take, for instance, the imaging of sub-surface objects at very low frequencies using nonlinear inverse scattering algorithm (Chew & Wang 1990). In this case, most measurements are done in the near field of the scattering object, and hence sub-wavelength resolution can easily be obtained (Aydiner et al . 2001).…”

Section: (A) Multipolesmentioning

confidence: 99%

Computational electromagnetics: the physics of smooth versus oscillatory fields

Chew

2004

Philosophical Transactions of the Royal Society of London. Seri

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This paper starts by discussing the difference in the physics between solutions to Laplace's equation (static) and Maxwell's equations for dynamic problems (Helmholtz equation). Their differing physical characters are illustrated by how the two fields convey information away from their source point. The paper elucidates the fact that their differing physical characters affect the use of Laplacian field and Helmholtz field in imaging. They also affect the design of fast computational algorithms for electromagnetic scattering problems. Specifically, a comparison is made between fast algorithms developed using wavelets, the simple fast multipole method, and the multi-level fast multipole algorithm for electrodynamics. The impact of the physical characters of the dynamic field on the parallelization of the multi-level fast multipole algorithm is also discussed. The relationship of diagonalization of translators to group theory is presented. Finally, future areas of research for computational electromagnetics are described.

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3-D imaging of large scale buried structure by 1-D inversion of very early time electromagnetic (VETEM) data

Cited by 13 publications

References 21 publications

Enhancements to and Characterization of the Very Early Time Electromagnetic (VETEM) Prototype Instrument and Applications to Shallow Subsurface Imaging at Sites in the DOE Complex - Final Report

Enhancements to and Characterization of the Very Early Time Electromagnetic (VETEM) Prototype Instrument and Applications to Shallow Subsurface Imaging at Sites in the DOE Complex - Final Report

Three-dimensional imaging of buried objects in very lossy earth by inversion of VETEM data

Computational electromagnetics: the physics of smooth versus oscillatory fields

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