科学通报 - Chinese Science Bulletin, 2015, Issue 23, pp.2188-2195
According to the field characteristics of laser pulse scattering from a random rough surface, laser pulse incoherence scattering characteristics and a covariance function of the scattered intensity fluctuation are investigated numerically using the integral transform, an error function and the statistical moments of random variables. For an incident laser pulse, numerical methods are used to calculate the coherent and incoherent scattering characteristics and the covariance function of the fluctuation in scattering intensity with the coherence bandwidth frequency and scattering angle, considering multiple factors such as the mean of fluctuating heights, the coherence length of a random rough surface, and the incidence angle. Results show that for the incident laser pulse, a smaller mean of the fluctuating height and a longer correlation length correspond to a smoother surface and larger maximum peak values of coherent and incoherent scattering components in the specular direction. The incoherent scattering peak value decreases more rapidly in the non-specular direction, and incoherent scattering components are an order of magnitude smaller than coherent scattering components. The distribution of the covariance function of the scattering field intensity fluctuation gradually reduces with an increase in the coherence bandwidth frequency difference, having a maximum peak value in the specular direction as the coherence bandwidth difference tends to zero. This paper presents innovative results that emphasize the incoherent scattering characteristics and the covariance function of the scattered intensity fluctuation for the further study of the fourth-order moment statistical characteristic of laser pulse scattering from a rough surface. Future works investigate other high-order statistical moments of laser pulse scattering from a rough surface and laser speckle in laser detection applications.
粗糙面散射 ; 脉冲散射 ; 四阶矩统计特征 ; 非相干散射特征 ; 强度起伏 ; 协方差函数 ; Scattering From Rough Surface, Laser Pulse Scattering, the Fourth Order Moment Statistical Characteristics, the Incoherencescattering Characteristics, the Scattered Intensity Fluctuation, Covariance Function
维普数据 (Chongqing VIP Information Co.)