中国激光, 2018, 45 (5): 0505002, 网络出版: 2018-05-02   

米氏理论下悬浮粒子对水下激光传输的影响 下载: 1255次

Influence of Suspended Particles Based on Mie Theory on Underwater Laser Transmission
张莹珞 1,2王英民 1,2,*黄爱萍 1,2
作者单位
1 西北工业大学深圳研究院, 广东 深圳 518057
2 西北工业大学航海学院, 陕西 西安 710072
摘要
针对海洋悬浮粒子引起水下激光传输信道的复杂性问题, 采用等效球形粒子米氏散射理论和蒙特卡罗数值模拟方法,研究海洋悬浮粒子对水下光通信链路的影响。分析了悬浮粒子特性及入射光波长与光学系数的关系, 研究了粒子尺寸和复折射率对接收归一化能量、接收光强、信道传输长度、信道时延的影响。理论分析和仿真结果表明:粒子的光学系数会随着粒子尺寸增大而增大, 使相同信道长度的接收归一化能量减小, 接收光强减弱, 信道时延增大;粒子复折射率虚部越小, 接收的归一化能量越强, 接收光强峰值越大, 但复折射率虚部相同而实部不同时, 接收光强峰值的大小取决于反照率, 反照率越大, 接收光强越大。
Abstract
In view of the complexity of underwater laser transmission channel caused by oceanic suspended particles, the effect of oceanic suspended particles on the underwater optical communication link is studied based on equivalent spherical particle Mie scattering theory and Monte Carlo simulation method. The characteristics of suspended particles and the relationship between the incident wavelength and the optical coefficients are analyzed. The effects of particle size and complex refractive index on the received normalized energy, received light intensity, channel transmission length and channel delay are investigated. Theoretical analysis and simulation results indicate that optical coefficients of the particles increase with the increase of particle size, thus the received normalized energy under same channel length decreases, received light intensity decreases, and the channel time delay increases. The smaller the imaginary part of the complex refractive index of the particles is, the stronger the received normalized energy and the greater the peak intensity of the received light are. However, when the imaginary part of the complex refractive index is the same but the real part is different, the magnitude of the received intensity peak depends on the albedo. The larger the albedo is, the stronger the received intensity is.

张莹珞, 王英民, 黄爱萍. 米氏理论下悬浮粒子对水下激光传输的影响[J]. 中国激光, 2018, 45(5): 0505002. Zhang Yingluo, Wang Yingmin, Huang Aiping. Influence of Suspended Particles Based on Mie Theory on Underwater Laser Transmission[J]. Chinese Journal of Lasers, 2018, 45(5): 0505002.

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