张勇， 易红亮^*， 谈和平

（  哈尔滨工业大学能源科学与工程学院，哈尔滨 150001；  ）

摘要： 偏振激光在散射性介质中的传输问题引起了广泛关注。探测光束的偏振信息在云雾、生物组织的光学成像，以及混杂介质微波探测中有很关键的作用。对不同角度、前后向偏振信号的获取和分析，可以得到关于介质内部结构和辐射物性的特征信息。对偏振激光在参与性介质中传递的研究需要求解瞬态矢量辐射传递方程。本文建立了脉冲激光作用下，非均匀参与性介质内瞬态矢量辐射传递的自然元求解模型，实现了瞬态过程平行光和漫射光Stokes矢量的同时自然元求解。通过对Mie散射介质内瞬态矢量辐射传输进行模拟，并将计算得到的不同时刻Stokes矢量分布曲线与MCM对比，验证了该模型具有高精度、高计算效率的特点。在此基础上，对脉冲激光辐照作用下"大气-海洋"两层系统内矢量辐射传输过程开展了自然元数值研究，分析了Stokes矢量，及其透反射信号和偏振特性的时变特征。
关键词： 工程热物理；参与性介质；矢量辐射；脉冲激光；自然元法

ZHANG Yong， YI Hongliang^*， TAN Heping

（  School of Energy Science and Technology, Harbin Institute of Technology, Harbin 150001；  ）

Abstract： The propagation of the polarized light pulses in scattering media has attracted a lot of interest recently. The detection of the polarization characteristics is of cruicial importance in optical imaging through clouds and fog, imaging in biological media, and microwave detection in clutter. Monitoring the transient polarized features of the forward- and the backward-scattering responses, for different angles of incidence and detection, may disclose some subtle details about the media's internal structure or/and radiative properties. In order to conduct the investigation of the polarized radiative transfer in scattering media, the transient vector radiative transfer equation is needed to be solved. In this work, the natural element method (NEM) model for the polarized light propagation model in one-dimensional scattering medium with the upper surface subjected to an oblique incident short-pulsed laser beam is established. Firstly, a square short-pulsed laser transport in the atmosphere with Mie scattering is simulated. The distributions of Stokes vector at different time obtained by the present method compares well with those by Monte Carlo method which shows that the NEM is accurate, and effective in solving transient polarized radiative transfer. Afterwards, the transient polarized radiative transfer problem in the atmosphere-ocean system is investigated. The time-resolved signals and the polarization state of the Stokes vector are presented and analyzed.
Keywords： Thermal engineering; Participant media; Vector radiative transfer; Short-pulsed laser; Natural element method

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