折射率和粒子尺度对大气气溶胶光散射特性的影响

采用Mie散射方法计算了小尺度范围内, 0.65 μm波长大气气溶胶粒子光学特性与折射率、粒子尺度参数的关系, 并分析了折射率虚部对气溶胶粒子散射相函数的影响。结果表明: 在小尺度范围内, 气溶胶粒子散射特性受折射率、尺度参数影响较大, 折射率实部和尺度参数对消光效率因子等非散射角散射参量的影响存在一定程度的对称性。同时还发现, 在特殊散射角位置, 无论对于单粒子还是对于多分散粒子群系统, 气溶胶粒子(群)的散射相函数与折射率虚部基本无关, 不同折射率虚部的散射相函数在前向散射方向存在交点, 交点位置随粒子尺度参数的变化基本为高斯分布。随着粒子尺度参数的增大, 交点位置向前向小角方向移动, 并逐步趋于离散。这一结论对了解大气气溶胶粒子的散射效应具有一定的参考意义。

Abstract

The effects of reflective index and particle size parameters on optical properties of atmosphere aerosol particles were studied by using Mie scattring method at the wavelength of 0.65 ?滋m over small scales. The influence of the imaginary part of refractive index on the aerosol particle scattering phase function was analyzed. The results show that, in the small scale, the light scattering properties are sensitive to the refractive index and size parameter. The influence of the real part of refractive index and size parameter on non-scattering angle optical parameters is a degree of symmetry. It was also found that in the special position of the scattering angle, no matter the single particle or polydisperse particles, the scattering phase function are independent of the imaginary part of refractive index, scattering phase functions of different imaginary part of refractive index have an intersection point in the forward direction, the intersection point takes Gaussian distribution with the increase of particle size parameter. With the increase of particle size parameter, the intersection point would move to the small forward direction, and gradually become discrete. This work is of reference value in studying the scattering properties of aerosols and their climatic effects.

参考文献

[1] 阎逢旗, 胡欢陵, 周军. 大气气溶胶粒子数密度谱和折射率虚部的测量[J]. 光学学报, 2003, 23(7): 855-859.

Yan Fengqi, Hu Huanling, Zhou Jun. Measurements of number density distribution and imaginary part of refractive index of aerosol particles[J]. Acta Optica Sinica, 2003, 23(7): 855-859. (in Chinese)

[2] 李学彬, 胡顺星, 徐青山, 等. 大气气溶胶消光特性和折射率的测量[J]. 强激光与粒子束, 2007, 19(2): 207-210.

Li Xuebin, Hu Shunxing, Xu Qingshan, et al. Characteristics measurement of extinction and refractive index of aerosol particles[J]. High Power Laser & Particle Beams, 2007, 19(2): 207-210. (in Chinese)

[3] 李学彬, 徐青山,胡欢陵. 双散射角光学粒子计数器测量气溶胶折射率的新方法研究[J]. 光学学报, 2007, 27(3): 391-394.

Li Xuebin, Xu Qingshan, Hu Huanling. New method to deduce imaginary part of refractive index of aerosol with double-scattering angles laser optical particle counter[J]. Acta Optica Sinica, 2007, 27(3): 391-394. (in Chinese)

[4] Yamamoto G, Tanaka M. Increase of global albedo due to air pollution[J]. Journal of the Atmospheric Sciences, 1972, 29(8): 1405-1412.

[5] Cong P H, Robles-Kelly A, Hancock E R. Shape and refractive index from single-view spectro-polarimetric images[J]. International Journal of Computer Vision, 2013, 101(1): 64-94.

[6] Yang B, Yan C, Zhang J, et al. Refractive index and surface roughness estimation using passive multispectral and multiangular polarimetric measurements[J]. Optics Communications, 2016, 381: 336-345.

[7] Zhao F, Gong Z, Hu H, et al. Simultaneous determination of the aerosol complex index of refraction and size distribution from scattering measurements of polarized light[J]. Applied Optics, 1997, 36(30): 7992-8001.

[8] Zhao F. Determination of the complex index of refraction and size distribution of aerosols from polar nephelometer measurements[J]. Applied Optics, 1999, 38(12): 2331-2336.

[9] Liou K N.大气辐射导论[M]. 2版. 廖国男, 郭彩丽, 周诗健,译. 北京: 气象出版社, 2004.

Liou K N. An Introduction To Atmospheric Radiation[M]. 2nd ed. Liao Guonan, Guo Caili, Zhou Shijian, Transl. Beijing: China Meteorological Press, 2004. (in Chinese)

[10] Wang G, Chakrabarti A, Sorensen C M, Effect of the imaginary part of the refractive index on light scattering by spheres[J]. Journal of the Optical Society of America A, 2015, 32(7): 1231-1235.

[11] 张学海, 魏合理．基于用几何光学和米散射法的球形粒子前向散射特性计算研究[J]．红外与激光工程, 2015, 44(5): 1485-1490.

Zhang Xuehai, Wei Heli. Forward scattering properties of spherical particles based on the geometrical optics method and Mie scattering[J]. Infrared and Laser Engineering, 2015, 44(5): 1485-1490. (in Chinese)

[12] 张学海, 魏合理, 戴聪明, 等. 取向比对椭球气溶胶粒子散射特性的影响[J]. 物理学报, 2015, 64(22): 224205.

Zhang Xuehai, Wei Heli, Dai Congming, et al. Influence of aspect ratio on the light scattering properties of spherical aerosol particles[J]. Acta Physica Sinica, 2015, 64(22): 224205. (in Chinese)

[13] Lock J A, Yang L. Interference between diffraction and transmission in the Mie extinction efficiency[J]. Journal of the Optical Society of America A, 1991, 8(7): 1132-1134.

[14] 宫纯文, 魏合理, 李学彬, 等. 取向比对圆柱状冰晶粒子光散射特性的影响[J]. 光学学报, 2009, 29(5): 1155-1159.

Gong Chunwen, Wei Heli, Li Xuebin, et al. The influence of the aspect ratio to the light scattering properties of cylinder ice particles[J]. Acta Optica Sinica, 2009, 29(5): 1155-1159. (in Chinese)

张学海, 戴聪明, 武鹏飞, 崔生成, 黄宏华, 刘铮, 毛宏霞, 苗锡奎, 魏合理. 折射率和粒子尺度对大气气溶胶光散射特性的影响[J]. 红外与激光工程, 2017, 46(12): 1211001. Zhang Xuehai, Dai Congming, Wu Pengfei, Cui Shengcheng, Huang Honghua, Liu Zheng, Mao Hongxia, Miao Xikui, Wei Heli. Effect of the refractive index and particle size parameter on light scattering properties of atmosphere aerosol[J]. Infrared and Laser Engineering, 2017, 46(12): 1211001.

折射率和粒子尺度对大气气溶胶光散射特性的影响

关于本站 Cookie 的使用提示

全站搜索

折射率和粒子尺度对大气气溶胶光散射特性的影响

相关论文

相关资讯

关于本站 Cookie 的使用提示

全站搜索