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不同形狀的非球形粒子對偏振傳輸特性的影響

Influence of Non-Spherical Particles with Different Shapes on Polarization Transmission Characteristic

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摘要

針對自然界的非球形粒子問題,對典型非球形粒子的偏振傳輸特性進行研究,采用T矩陣算法研究橢球、圓柱和切比雪夫粒子的偏振傳輸特性,及其與球形粒子偏振傳輸特性的差異。研究結果表明:對于橫縱軸之比中等的橢球粒子,當散射角小于60°時,不同形狀橢球粒子的偏振度(DOP)差異較小,可用Mie散射方法進行粒子偏振特性的近似計算;當散射角大于60°時,DOP隨橫縱軸之比的變化較大,且球形與橢球粒子的DOP差異隨著橫縱軸之比的增加而增大;對于直徑與高度之比中等的圓柱體粒子,DOP的變化相比于橢球粒子更加平穩,但后向散射與側向散射區域仍不能采用Mie散射進行近似計算;形狀比例極端的橢球粒子和圓柱體粒子的偏振曲線均類似于鐘形,且在散射角約為90°時DOP達到最大值;切比雪夫粒子的形變參數和級次都對粒子前向散射偏振特性的影響較小,但對后向散射偏振特性的影響較大,且靈敏度隨級次的增加而減小。本研究結果可為非球形粒子偏振傳輸特性的研究及球形粒子近似提供理論指導。

Abstract

We investigate the polarization transmission characteristic of typical non-spherical particles to solve the problems encountered by these particles in nature. The polarization transmission characteristics of the ellipsoid, cylindrical, and Chebyshev particles while applying the T-matrix algorithm and the difference in the polarization transmission characteristics of the spherical particles are studied. The results denote that for the ellipsoid particles with medium ratio of transverse and longitudinal axis, the degree of polarization (DOP) variation with different shapes is very small and can approximate with that for the Mie scattering method when the scattering angle is less than 60°. In case of the scattering angle being larger than 60°, the DOP is rather changeable with different transverse and longitudinal axis ratios. Further, the difference between the spherical and ellipsoid particles significantly changes with the increasing ratio. The DOP variation in case of the cylinder particles with medium ratio of diameter and height is more stable than that observed in case of the ellipsoid particles but is still not suitable for performing Mie scattering approximation in the side-scattering and back-scattering area. The polarization curves for the extreme-ratio ellipsoid and cylinder particles exhibit a shape similar to that of a bell and has the largest DOP at a scattering angle of 90°. The deformation parameters and the levels of Chebyshev particles have little effect on the polarization characteristic in the forward scattering area but considerable influence in the back-scattering area. The sensitivity also decreases with the increasing level. These results provide theoretical guidance for studying the polarization transmission characteristic of the non-spherical particles and the approximation problem of the spherical particles.

Newport宣傳-MKS新實驗室計劃
補充資料

DOI:10.3788/AOS201939.0629001

所屬欄目:散射

基金項目:國家自然科學基金青年科學基金、長春理工大學創新基金項目;

收稿日期:2018-11-19

修改稿日期:2019-03-11

網絡出版日期:2019-06-17

作者單位    點擊查看

張肅:長春理工大學空地激光通信技術國防重點學科實驗室, 吉林 長春130022
戰俊彤
付強:長春理工大學空地激光通信技術國防重點學科實驗室, 吉林 長春130022
段錦:長春理工大學電子信息工程學院, 吉林 長春130022
李英超:長春理工大學空地激光通信技術國防重點學科實驗室, 吉林 長春130022
姜會林:長春理工大學空地激光通信技術國防重點學科實驗室, 吉林 長春130022

聯系人作者:戰俊彤(673895960@qq.com)

備注:國家自然科學基金青年科學基金、長春理工大學創新基金項目;

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引用該論文

Su Zhang, Juntong Zhan, Qiang Fu, Jin Duan, Yingchao Li, Huilin Jiang. Influence of Non-Spherical Particles with Different Shapes on Polarization Transmission Characteristic[J]. Acta Optica Sinica, 2019, 39(6): 0629001

張肅, 戰俊彤, 付強, 段錦, 李英超, 姜會林. 不同形狀的非球形粒子對偏振傳輸特性的影響[J]. 光學學報, 2019, 39(6): 0629001

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