毛玻璃和体散射介质的散射等效性对比研究

Comparison of Scattering Equivalence Between Ground Glass and Volume Scattering Media

日常生活中常常会出现各种散射介质,如毛玻璃、生物软组织和云雾等。毛玻璃一般可看作是没有厚度的面散射介质,即随机相位屏,而鸡胸肉等生物软组织是厚度不可忽略的体散射介质。光在鸡胸肉等体散射介质内的传播过程复杂,受厚度、各向异性因子等因素的影响。在实际研究中,科研人员经常选用毛玻璃作为散射介质,并倾向于把相关结论直接推广到鸡胸肉等体散射介质上。从能量分布出发,对比分析了毛玻璃和体散射介质在成像和散射强度分布上的差异,提出了一种积分发散角测量方法,探究了二者散斑分布近似等效的条件。

In our daily life,we often come into contact with various scattering media,such as ground glass,biological soft tissues,clouds and fog.Ground glass can generally be considered as a surface scattering medium without thickness,that is,a random phase mask.But biological soft tissues such as chicken breast are volume scattering media with a non-negligible thickness.The propagation process of light in a volume scattering medium such as chicken breast is complicated and is affected by factors such as thickness and anisotropy factor.In experiments,researchers often choose ground glass as the scattering medium,and tend to extend the relevant conclusions directly to the volume scattering medium such as chicken breast.We compare and analyze their differences in imaging and scattering energy distribution between ground glass and volume scattering media based on the energy distribution.In addition,we have proposed and used an integral divergence angle measurement method to explore the conditions under which the two speckle distributions are approximately equivalent.