典型多尺度海面结构体辐射散射方向-光谱特性计算与分析  

Calculation and analysis of radiation scattering directional-spectral characteristics of featured multi-scale voxels of sea surface

作　　者：周茜 李霞[2] 陈奇祥 袁远[1] 刘兴润[2] 王晓航 ZHOU Qian;LI Xia;CHEN Qixiang;YUAN Yuan;LIU Xingrun;WANG Xiaohang(Institute of Aerospace Thermophysics,School of Energy Science and Engineering,Harbin Institute of Technology,Harbin 150006,China;Beijing Institute of Environmental Characteristics,Beijing 100143,China)

机构地区：[1]哈尔滨工业大学能源科学与工程学院,航空航天热物理研究所,哈尔滨150006 [2]北京环境特性研究所,北京100143

出　　处：《哈尔滨工业大学学报》2024年第2期105-114,共10页Journal of Harbin Institute of Technology

基　　金：中国博士后基金面上项目(2022M720943)。

摘　　要：针对3级以上海况的高精度海洋场景红外仿真问题,提出一种“先拆后建”的研究思路:将含泡沫和破碎波的多尺度海面抽象为粗糙海面、泡沫、破碎波的组合,进而拆解出“粗糙海面”、“含泡沫粗糙海面”、“含破碎波粗糙海面”3类典型多尺度海面结构体,最后通过海面栅格化、结构体匹配、方向-光谱特性重构渲染等方法,由3类典型多尺度结构体方向-光谱特性组合重构大范围海面辐射散射特性,完成多尺度海面“气-面-体”耦合辐射/散射特性的计算。对拆解出的3类典型多尺度海面结构体分别开展多尺度耦合辐射、散射特性建模研究,构建3类多尺度海面结构体辐射散射方向-光谱特性计算模型,并对结构体辐射散射方向-光谱特性的影响因素进行分析,结果表明:随着海面风速的增大,海面典型结构体中的泡沫厚度及气泡浓度逐渐增大,使得结构体的散射能力增强,从而增大结构体的双向反射分布函数;随着探测波长的增大,海水的吸收性显著增强,导致不同风速条件下结构体双向反射分布函数之间的差异显著增大;对于不同的入射角,结构体双向反射分布函数最大值对应的天顶角随入射天顶角的变化逐渐发生变化。A research approach of"dismantling and building"is proposed for high-precision ocean scene infrared simulation of sea surface with state level above 3.In this approach,the large-scale sea surface is described as a combination of rough sea surface,foam and breaking waves;then three kinds of featured multi-scale voxels,namely"rough sea surface","rough sea surface covering foam",and"rough sea surface covering breaking waves",are abstracted from the complex sea surface.Finally,by means of sea surface gridding,featured voxels matching,rendering based on directional-spectral characteristics reconstruction and other methods,the large-scale sea surface radiation/scattering characteristics are reconstructed with the three kinds of featured multi-scale voxels and the calculation of large-scale sea surface"air-surface-body"coupling radiation/scattering characteristics is completed.This article conducted modeling research on multi-scale coupled radiation and scattering characteristics of three kinds of featured multi-scale voxels.A calculation model for the radiation/scattering directional-spectral characteristics of three kinds of featured multi-scale voxels was constructed and the factors influencing the radiation scattering direction spectral characteristics of the structures were analyzed.The calculation results indicate that with the increase of the sea surface wind speed,the thickness of foam and the concentration of bubbles in the typical structure on the sea surface gradually increase,which makes the scattering ability of the structure increase,thus increasing the bidirectional reflectance distribution function of the structure.With the increase of the detection wavelength,the absorption of seawater is significantly enhanced,which leads to a significant increase in the difference between the bidirectional reflectance distribution function of structures under different wind speeds.For different incident angles,the zenith angle corresponding to the maximum value of bidirectional reflectance distribution function of any

关 键 词：典型多尺度海面结构体 大气-海洋辐射传输模型 蒙特卡洛 双向反射分布函数 

分 类 号：O432[机械工程—光学工程]