Open AccessThe fourth order moment statistical characteristic of the laser pulse scattering on random rough surface
Author(s) -
Mingjun Wang,
Yingle Li,
Zhensen Wu,
Hui Zhang,
Zhang Xiao-An
Publication year - 2009
Publication title -
wuli xuebao
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.199
H-Index - 47
ISSN - 1000-3290
DOI - 10.7498/aps.58.2390
Subject(s) - scattering , physics , moment (physics) , coherence (philosophical gambling strategy) , optics , bandwidth (computing) , rough surface , coherence length , second moment of area , computational physics , quantum mechanics , materials science , telecommunications , superconductivity , thermodynamics , computer science , composite material
According to Kirchhoffs approximationthe fourth order moment statistical characteristic of the pulsed wave scattering by random rough surfaces is investigated numerically. As a special applicationthe fourth order moment FOM is simplified to obtain mutual correlation functions of the the two positions and two frequencies of pulsed wave scattering by random rough surface. It is found that the distributions of FOM vary with the coherence bandwidth frequency difference and scattering angle for different incidence angles. The numerical results show that the mean of fluctuating heights and coherent length of random rough surfaces have also an important influence on FOM. Generallythe largest scattering value and smallest coherence bandwidth of the FOM occur at the specific directions. That is to saythe FOM will have a lower coherent component and its distributions of scattering angles will be broadened in relation to the rugged surface. Meanwhilethe FOM decreases rapidly when there is a bigger coherence bandwidth frequency difference.