沙尘天气下激光信号的传输特性

王惠琴; 姚宇; 曹明华

doi:10.3788/fgxb20173804.0521

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沙尘天气下激光信号的传输特性

发光学应用及交叉前沿 | 更新时间：2020-08-12

- 沙尘天气下激光信号的传输特性
- Transmission Characteristics of Laser Signal in Sand and Dust Weather
- 发光学报 2017年38卷第4期页码：521-529
- 作者机构：
  
  兰州理工大学计算机与通信学院, 甘肃兰州 730050
- 作者简介：
- 基金信息：
  
  国家自然科学基金（61265003，61465007）;兰州理工大学博士基金（14-0232）资助项目
- DOI：10.3788/fgxb20173804.0521
  中图分类号： TN929.12
- 纸质出版日期：2017-4-5，
  
  收稿日期：2016-10-8，
  
  修回日期：2016-12-10，
扫描看全文
王惠琴, 姚宇, 曹明华. 沙尘天气下激光信号的传输特性[J]. 发光学报, 2017,38(4): 521-529

WANG Hui-qin, YAO Yu, CAO Ming-hua. Transmission Characteristics of Laser Signal in Sand and Dust Weather[J]. Chinese Journal of Luminescence, 2017,38(4): 521-529
王惠琴, 姚宇, 曹明华. 沙尘天气下激光信号的传输特性[J]. 发光学报, 2017,38(4): 521-529 DOI： 10.3788/fgxb20173804.0521.

WANG Hui-qin, YAO Yu, CAO Ming-hua. Transmission Characteristics of Laser Signal in Sand and Dust Weather[J]. Chinese Journal of Luminescence, 2017,38(4): 521-529 DOI： 10.3788/fgxb20173804.0521.

摘要

以小角度近似为条件'利用逐级递归的方法推导了激光信号在沙尘天气下的辐射传输方程'得到了多次散射下的光强分布函数'以及波长和不对称因子对光强的影响。同时'通过比较不同散射相位函数及沙尘粒子的散射特性'采用了修正的TTHG（Two Term Henyey-Greenstein）散射相位函数'更加全面地反映了沙粒散射后光强的变化规律。研究结果表明'随着光学厚度的增加'散射光强呈现出先增大后减小的趋势'且多次散射的比重相比于单次散射而言逐渐增大。当散射次数超过3次以上时'接收光强的变化可以忽略不计。相对于Mie理论下的结果而言'采用小角度近似理论'从辐射传输的角度分析沙粒的散射特性误差更小'实现了准确描述沙尘天气下激光信号传输特性的目的。

Abstract

Based on the small-angle approximation condition

the radiation propagation equation of the laser signal in dust weather was deduced by using sequential recursive method

the distribution of light intensity under multiple scattering was obtained

and the wavelength and the asymmetry factor's influence on the scattering light intensity were also analyzed. Furthermore

by comparing the different scattering phase functions and the scattering characteristics of the dust particles

an amended Two Term Henyey-Greenstein (TTHG) phase function was adopted

which can reflect the scattered light intensity distribution more comprehensive. The results show that the scattered light intensity increases firstly and then decreases with the increasing of the optical thickness

and the proportion of the multiple-scattering becomes larger gradually. When the scattering number is more than three times

the change of the received light intensity can be ignored. Compared with Mie theory

the results of the small-angle approximation method are more reliable

which can accurately describe the laser signal transmission characteristics in dust weather.

关键词

小角度近似多次散射散射相位函数衰减特性

Keywords

small-angle approximationmultiple scatteringscattering phase functionattenuation characteristics

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