GPU-based acceleration of the time-domain electrical full-wave solvers in PI/SI/EMI simulation

2011 ◽  
Author(s):  
Hideki Asai
Keyword(s):  
Time Domain ◽  
Full Wave ◽  
The Time Domain

Full-wave seismic illumination and resolution analyses: A Poynting-vector-based method

Geophysics ◽  
2016 ◽  
Vol 81 (6) ◽  
pp. S447-S458 ◽  
Author(s):  
Zhe Yan ◽  
Xiao-Bi Xie
Keyword(s):  
Time Domain ◽  
Poynting Vector ◽  
Imaging System ◽  
Depth Image ◽  
Source Spectrum ◽  
Input Output ◽  
Full Wave ◽  
Time Migration ◽  
Resolution Analysis ◽  
The Time Domain

Illumination and resolution analysis provides vital information regarding the response of an imaging system to subsurface structures. However, generating the resolution function is often computationally intensive, which prevents it from being widely used in practice. This problem is particularly severe for the time-domain migration method, such as reverse time migration (RTM). To solve this problem, we have developed a fast full-wave-based illumination and resolution analysis method. The source- and receiver-side waves are extrapolated to the subsurface for simulating the imaging process. To create the relations linking the incident and scattering directions to the target wavenumber components, we have adopted an efficient Poynting-vector-based method for wavefield angle decomposition. By taking the approximation that the time-domain wavefield preserves the source spectrum during propagation, massive input/output and trace-by-trace Fourier transform can be avoided and the finite-frequency calculated broadband signal can be directly converted to the wavenumber domain for calculating the point spreading functions (PSFs). Combining these approaches, the resulting method avoids intensive calculations, massive input/output, and huge storage requirements commonly involved in generating the illumination and resolution functions. The method is highly efficient and particularly suitable to team with RTM for resolution analysis. Numerical examples are used to validate this method. We have determined how to calculate the acquisition dip response and PSFs, based on which, the quality of the depth image can be significantly improved.

scholarly journals Terahertz Waveguide-Based Pulse-Shaper System Analysis and Modeling

2021 ◽  
Author(s):  
seyed mohammadreza razavizadeh ◽  
Ramezanali Sadeghzadeh ◽  
Zahra Ghattan kashani
Keyword(s):  
Transfer Function ◽  
Time Domain ◽  
System Analysis ◽  
Time Domain Analysis ◽  
Pulse Shaper ◽  
Terahertz Pulse ◽  
Wave Simulation ◽  
Full Wave ◽  
Time Domain Data ◽  
The Time Domain

Abstract In this paper, the transfer function of a passive waveguide-based terahertz pulse shaper is achieved using the time domain data provided by the full-wave simulation of the structure. The fractional order of the transfer function is determined based on the time response resulting from an arbitrary excitation of the proposed pulse shaper. The full-wave electromagnetic numerical analyses are applied to attain the time-domain output data of the helical gold-ribbon dielectric-lined waveguide as the terahertz pulse shaper. In order to verify the simulation results, the proposed device has been examined using two different numerical methods which are the Finite Element Method (FEM) and the Finite Integral Technique (FIT). A good agreement was found between the results of FIT and FEM methods. The use of the system transfer function to analyze the structure is preferable to the full-wave simulation because of saving the execution time. Once the transfer function is determined, one could apply it for the subsequent time-domain analysis of the pulse shaper with various inputs.

Apodisation in the time domain

1992 ◽  
Vol 2 (4) ◽  
pp. 615-620
Author(s):  
G. W. Series
Keyword(s):  
Time Domain ◽  
The Time Domain
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