太赫兹波段下切比雪夫粒子散射特性研究  

Study on the scattering characteristics of Chebyshev particles in the terahertz band

作　　者：徐怡 王金虎[1,2,4] 金文雨 丁江乔 XU Yi;WANG Jing-hu;JIN Wen-yu;DING Jiang-qiao(Collaborative Innovation Center on Forecast and Evaluation of Meteorological Disasters,Nanjing University of Information Science and Technology,Nanjing 210044,China;School of Emergency Management,Nanjing University of Information Engineering,Nanjing 210044,China;School of Electronic and Information Engineering,Nanjing University of Information Engineering,Nanjing 210044,China;Key Laboratory of Middle Atmosphere and Global Environment Observation,Chinese Academy of Sciences,Beijing 100029,China)

机构地区：[1]南京信息工程大学气象灾害预报预警与评估协同创新中心,江苏南京210044 [2]南京信息工程大学应急管理学院,江苏南京210044 [3]南京信息工程大学电子与信息工程学院,江苏南京210044 [4]中国科学院中层大气和全球环境探测重点实验室,北京100029

出　　处：《激光与红外》2024年第3期346-354,共9页Laser & Infrared

基　　金：国家自然科学基金项目(No.41905026);江苏省自然科学基金资助项目(No.BK20170945);南京信息工程大学人才启动基金资助项目(No.2016r028);中国博士后科学基金第63批面上资助项目(No.2018M631554);江苏省333工程高层次人才培养资助(第三层次)资助。

摘　　要：为探究太赫兹波段下沙尘粒子的散射特性,本文采用离散偶极子近似方法对不同切比雪夫模型(Chebyshev)的沙尘粒子散射特性进行研究。分别计算1.5 THz、2.524 THz、3.437 THz频率下的切比雪夫粒子不同物理性质如粒子尺寸、粒子形状,对其散射特性如后向散射截面(C_(bak))、衰减截面(C_(ext))、散射截面(C_(sca))、单次散射反照率(ω)等的影响。结果表明:同一波纹参数下,1.5 THz时粒子尺寸对Cext和Csca的影响较大;2.524 THz时粒子尺寸变化对C_(bak)影响较大;同一频率下,波形参数为2~5的粒子尺寸变化对各光学截面的影响较其他形状有明显不同;三个频率下,各波纹参数的粒子在有效半径大于10μm时单次散射反照率都大于0.95。In this paper,the discrete dipole approximation method is adopted to study the scattering characteristics of dust particles in different Chebyshev models in order to investigate the scattering characteristics of dust particles in the terahertz band.The effects of different physical properties such as particle size and particle shape on their scattering characteristics including backscatter section(C_(bak)),attenuation section(C_(ext)),scattering section(C_(sca)),single scatter albedo(ω)for the frequencies of 1.5 THz,2.524 THz,and 3.437 THz are calculated,respectively.The results show that under the same ripple parameters,the particle size at 1.5 THz has a greater effect on Cext and Csca;the particle size changes at 2.524 THz has a larger effect on Cbak.Under the same frequency,the particle size change of the waveform parameter of 2~5 has a significantly different effect on each optical cross section compared with the other shapes.Under the three frequencies,particles of each ripple parameter with the effective radius larger than 10μmwhen the single scattering albedo is greater than 0.95.

关 键 词：切比雪夫粒子 离散偶极子近似方法 散射特性 波纹参数 

分 类 号：P401[天文地球—大气物理学与大气环境] O436[天文地球—大气科学及气象学]