Thermal scene analysis via finite element model and finite difference time domain numerical solution of the electromagnetic wave propagation in the short wave and long wave infrared bandarch

2009 ◽  
Author(s):  
Alessandro Albertoni
Keyword(s):  
Electromagnetic Wave ◽  
Time Domain ◽  
Finite Difference Time Domain ◽  
Electromagnetic Wave Propagation ◽  
Element Model ◽  
Short Wave ◽  
Scene Analysis ◽  
Long Wave ◽  
Long Wave Infrared ◽  
Difference Time

Numerical Simulation of GPR Electromagnetic Wave Propagation in Rigid Pavement with Voids Based on FDTD

2011 ◽  
Vol 250-253 ◽  
pp. 2765-2768
Author(s):  
Yan Hui Zhong ◽  
Bei Zhang ◽  
Xiao Li Xie ◽  
Fu Ming Wang ◽  
Cheng Chao Guo
Keyword(s):  
Wave Propagation ◽  
Electromagnetic Wave ◽  
Time Domain ◽  
Finite Difference Time Domain ◽  
Theoretical Basis ◽  
Electromagnetic Wave Propagation ◽  
Rigid Pavement ◽  
Two Dimension ◽  
The Relationship ◽  
Difference Time

Two-dimension finite difference time domain (FDTD) update equations are established, and the GPR electromagnetic wave propagation in rigid pavement with voids beneath slabs is numerical simulated by using effective CPML boundary conditions, and then the two-Dimension GPR images for voids beneath slab are obtained. Moreover, the relationship between characteristics of voids beneath rigid slabs and GPR data is analyzed. The achievements of this paper will provide a theoretical basis for the use of GPR to rapidly detect voids beneath rigid slab.

Systematic wave-equation finite difference time domain formulations for modeling electromagnetic wave-propagation in general linear and nonlinear dispersive materials

2015 ◽  
Vol 26 (04) ◽  
pp. 1550046 ◽  
Author(s):  
Omar Ramadan
Keyword(s):  
Wave Propagation ◽  
Wave Equation ◽  
Electromagnetic Wave ◽  
Finite Difference ◽  
Time Domain ◽  
Finite Difference Time Domain ◽  
Electromagnetic Wave Propagation ◽  
Complex Conjugate ◽  
Linear And Nonlinear ◽  
Difference Time

In this paper, systematic wave-equation finite difference time domain (WE-FDTD) formulations are presented for modeling electromagnetic wave-propagation in linear and nonlinear dispersive materials. In the proposed formulations, the complex conjugate pole residue (CCPR) pairs model is adopted in deriving a unified dispersive WE-FDTD algorithm that allows modeling different dispersive materials, such as Debye, Drude and Lorentz, in the same manner with the minimal additional auxiliary variables. Moreover, the proposed formulations are incorporated with the wave-equation perfectly matched layer (WE-PML) to construct a material independent mesh truncating technique that can be used for modeling general frequency-dependent open region problems. Several numerical examples involving linear and nonlinear dispersive materials are included to show the validity of the proposed formulations.

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