Publicou 18 edições por ano
ISSN Imprimir: 1064-2285
ISSN On-line: 2162-6561
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FINITE ELEMENT FREQUENCY-DOMAIN DIFFUSION APPROXIMATION OF TRANSIENT RADIATIVE TRANSPORT IN PLANAR GRADED INDEX MEDIA
RESUMO
The diffusion approximation equation in a frequency domain is presented for analyzing laser pulse transport in graded index planar media, and a finite element method is developed to obtain the solutions. The amplitude and phase of the hemispherical reflectance and the transmittance in the frequency domain are investigated. The effect of the optical depth and single scattering albedo of the media on the precision of the diffusion approximation are analyzed as compared to the results obtained on the basis of the radiative transfer equation. The results show that the diffusion approximation has a poor accuracy in the case where the radiative intensity is most unevenly distributed. The phase predicted by the finite element method based on the diffusion approximation is greatly influenced by the wave shape of the incident pulse.