Application and optimization of the perfectly matched layer boundary condition for geophysical simulations

Johnson, David E.; Furse, Cynthia; Tripp, Alan C.

doi:10.1002/(sici)1098-2760(20000520)25:4<253::aid-mop8>3.0.co;2-8

Cited by 7 publications

(2 citation statements)

References 10 publications

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“…In this paper, the power of the three-dimensional (3-D) FDTD method together with the perfectly matched layer (PML) [21]- [26] absorbing boundary condition is employed to investigate the behavior of a specific GPR configuration. The elements of the GPR problem, as modeled in this study, are depicted in Fig.…”

Section: Introductionmentioning

confidence: 99%

Optimization of the transmitter-receiver separation in the ground-penetrating radar

Gürel

Oğuz

2003

IEEE Trans. Antennas Propagat.

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Section: Introductionmentioning

confidence: 99%

Optimization of the transmitter-receiver separation in the ground-penetrating radar

Gürel

Oğuz

2003

IEEE Trans. Antennas Propagat.

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“…In this paper, three-dimensional (3-D) FDTD simulation results of GPR systems are presented for design, analysis, and evaluation purposes. A perfectly matched layer (PML) [12]- [17] absorbing boundary condition (ABC) is employed to terminate the FDTD computational domain. In addition to this usual function of the PML at the borders, in this paper, we report a novel use of the PML ABC inside the FDTD computational domain to simulate physical absorbers.…”

Section: Introductionmentioning

confidence: 99%

Modeling of ground-penetrating-radar antennas with shields and simulated absorbers

Oğuz

Gürel

2001

IEEE Trans. Antennas Propagat.

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Cataloged from PDF version of article.A three-dimensional (3-D) finite-difference time-domain\ud (FDTD) scheme is employed to simulate ground-penetrating\ud radars. Conducting shield walls and absorbers are used to reduce\ud the direct coupling to the receiver. Perfectly matched layer (PML)\ud absorbing boundary conditions are used for matching the multilayered\ud media and simulating physical absorbers inside the FDTD\ud computational domain. Targets are modeled by rectangular prisms\ud of arbitrary permittivity and conductivity. The ground is modeled\ud by homogeneous and lossless dielectric media

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FDTD modeling and validation of EM survey tools

Johnson

Furse

Tripp

2002

Micro & Optical Tech Letters

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measured S parameters at each bias point, the intrinsic Y parameters at each bias point can be obtained [5]. The seven intrinsic elements can thus be uniquely determined by the four complex de-embedded intrinsic Y parameters [4, 5]. RESULTS AND DISCUSSIONSA uniform-doped MESFET with doping density of 2.9 ϫ 10 17 /cm 3 was studied here. The coplanar device has gate width of 6ϫ50 m and gate length of 1 m. S parameters were obtained through on-wafer measurements. Figure 2 illustrates the normalized circuit elements as a function of frequencies when V gs ϭ Ϫ 0.5V and V ds ϭ 8 V. The extracted intrinsic elements have no frequency dependence as illustrated in Figure 2. This proves the validity of extraction method and equivalent circuit topology. Radio-frequency transconductance gm and rf channel conductance gds as a function of V ds with V gs as a parameter are illustrated in Figure 3. Once gm and gds at all bias points are extracted, rf I-V can be calculated from an integral of the bias-dependent rf transconductance gm and rf channel conductance gds in the V gs and V ds voltage plane. The S parameters were measured at 0.1 V per step for V ds less than 2 V to improve rf I-V accuracy. Figure 4 illustrates the measured static I-V curves and the calculated rf I-V curves. As expected, the rf I-V curves differ from static I-V curves. Power saturation and gain compression caused by knee voltage and maximum channel current can thus be accurately modeled through the obtained rf I-V curve. SUMMARYIn conclusion, an approach to uniquely determine each circuit element from measured S parameters is used to obtain rf I-V curve for uniform-doped MESFET. This resulting rf I-V curve is very useful to evaluate and model device rf performance. INTRODUCTIONFinite-difference-time-domain (FDTD) methods, which are widely used for electromagnetic simulations in many applications, are now often used as an effective simulation technique for geophysical applications [1][2][3][4][5]. In many geophysical applications, the source is a current loop that is very small compared with the wavelength. This Letter describes details of the FDTD source model that are needed for accurate analysis of realistic current loops used in cross-borehole EM surveys for highly conducting ore bodies in resistive hosts. FDTD SIMULATION OF CURRENT LOOPSTransmitters and receivers used in cross-borehole geophysical EM surveys are loop antennas wrapped around dielectric cores and lowered down well boreholes, often using several different wells and/or heights within these wells as locations for transmitter and receiver loops. Broadband pulses on these antennas maximize resolution and minimize overprinting of a modest response of an ore target by a large incident field. Infinitesimal magnetic and electric dipoles can be used to model transmitter and receiver loops that are commonly used for * Formerly with Department of Geology and Geophysics, 717 WBB, University of Utah, Salt Lake City, Utah 84112. surveys, but direct implementation in the FDTD grid is not sufficiently ac...

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Application and optimization of the perfectly matched layer boundary condition for geophysical simulations

Cited by 7 publications

References 10 publications

Optimization of the transmitter-receiver separation in the ground-penetrating radar

Optimization of the transmitter-receiver separation in the ground-penetrating radar

Modeling of ground-penetrating-radar antennas with shields and simulated absorbers

FDTD modeling and validation of EM survey tools

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