scholarly journals High-frequency asymptotic solution for scattered fields by a junction of planar impedance surfaces

2010 ◽  
Vol 7 (14) ◽  
pp. 1072-1078 ◽  
Author(s):  
Toru Kawano ◽  
Keiji Goto ◽  
Toyohiko Ishihara
Keyword(s):  
Asymptotic Solution ◽  
High Frequency ◽  
Scattered Fields

scholarly journals THE MULTILEVEL FAST PHYSICAL OPTICS METHOD FOR CALCULATING HIGH FREQUENCY SCATTERED FIELDS

2020 ◽  
Vol 169 ◽  
pp. 1-15
Author(s):  
Zhiyang Xue ◽  
Yu Mao Wu ◽  
Weng Cho Chew ◽  
Ya-Qiu Jin ◽  
Amir Boag
Keyword(s):  
High Frequency ◽  
Physical Optics ◽  
Scattered Fields

Zeroth‐order asymptotics: Waveform inversion of the lowest degree

Geophysics ◽  
2003 ◽  
Vol 68 (2) ◽  
pp. 614-628 ◽  
Author(s):  
D. W. Vasco ◽  
Henk Keers ◽  
John E. Peterson ◽  
Ernest Majer
Keyword(s):  
Asymptotic Solution ◽  
High Frequency ◽  
Perturbation Technique ◽  
Waveform Inversion ◽  
Time Derivative ◽  
Zero Order ◽  
Bacterial Transport ◽  
Forward Simulation ◽  
Inversion Algorithm ◽  
Transport Site

Sensitivity computation is an integral part of many waveform inversion algorithms. An accurate and efficient technique for sensitivity computation follows from the zero‐order asymptotic solution to the elastodynamic equation of motion. Given the particular form of the asymptotic solution, we show that perturbations in high‐frequency waveforms are primarily sensitive to perturbations in phase. The resulting expression for waveform sensitivity is the time derivative of the synthetic seismogram multiplied by the phase sensitivity. All of the necessary elements for a step in the waveform inversion algorithm result from a single forward simulation. A comparison with sensitivities calculated using a purely numerical perturbation technique demonstrates that zero‐order sensitivities are accurate. Based upon the methodology, we match 330 waveforms from a crosswell experiment at a bacterial transport site near Oyster, Virginia. Each iteration of the waveform inversion takes approximately 18 minutes of CPU time on a workstation, illustrating the efficiency of the approach.

Asymptotic solution of wave-radiating damping at high frequency

1992 ◽  
Vol 14 (3) ◽  
pp. 165-173 ◽  
Author(s):  
Weiguang Bao ◽  
Takeshi Kinoshita
Keyword(s):  
Asymptotic Solution ◽  
High Frequency

High-Frequency Analyses for Scattered Fields by a Cylindrically Curved Conducting Surface

2009 ◽  
Vol E92-C (1) ◽  
pp. 25-32 ◽  
Author(s):  
Keiji GOTO ◽  
Toru KAWANO ◽  
Toyohiko ISHIHARA
Keyword(s):  
High Frequency ◽  
Conducting Surface ◽  
Scattered Fields
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