第6期
第26卷 2018年6月
文章编号
1004-924X(2018)06-1354-08
光学精密工程
Optics and Precision Engineering
雾和气溶胶前向散射对消光的影响
魏昊明“，赵威，戴星灿（清华大学物理系，北京100084）
Vol. 26No.6
Jun.2018
摘要：光电工程中探测器接收的光强包括透射光和大气前向散射光。雾和大气气溶胶粒子的前向散射增强了透射光，从而导致测量的衰减比实际衰减小。本文采用Mie散射理论，根据气溶胶谱分布以及雾滴的谱分布模型及其与能见度的经验关系，计算了可见光到中波红外波长的前向散射修正因子。详细分析了激光在气溶胶和雾衰减中前向散射修正因子随粒子平均半径、能见度和波长等参数的变化关系，并拟合出前向散射修正因子随粒子平均半径和视场乘积的经验关系式，在10"视场内平均残差小于0.02，可为相关光电工程提供参考。
键词：前向散射；消光；修正固子；气溶胶；募关
中图分类号：P427.12;P413
文献标识码：A
dol:10.3788/OPE.20182606.1354
Influence of fog and aerosol particles'forward-scattering
on light extinction
WEIHao-ming'，ZHAOWei，DAIXing-can
(DepartmentofPhysics，TsinghuaUniversity，Beijing100084，China）*Correspondingauthor,E-mail:weihml5@mails.tsinghua.edu.cn
Abstract: In opto-electronic engineering, the light intensity received by the detector includes transmit-ted light and forward-scattered light. Fog and atmospheric aerosol particles forward-scattered light in creases the transmission, resulting in a measured extinction that is lower than the real amount. Using the Mie scattering theory, based on the atmospheric aerosol particles' size distribution function and an empirical relationship between water content and visibility in fog, the correction factor (CF) of for ward-scattering for the extinction of wavelengths in the visible to middle-infrared region was calculat ed. The influence of parameters such as effective radius, visibility, and wavelength on the forward-scattering CF was discussed in detail. An empirical relationship between the CF and the product of the Field-of-View (FOV) and size parameter was fitted out based on the calculated results, and the mean
residual is less than 0. o2. The results may be applied in related engineering programs. Keywords:forward scattering;extinction;correction factor;aerosol;fog
收稿日期：2017-12-29；修订日期：2018-02-10
基金项目：自然科学基金资助项目（No.11474178）