| 太赫兹波在雾中的多重散射特性 |
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| 引用本文： | 王蓉蓉,吴振森,张艳艳,王明军,巩蕾.太赫兹波在雾中的多重散射特性[J].强激光与粒子束,2014,26(11):113101. |
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| 作者姓名： | 王蓉蓉 吴振森 张艳艳 王明军 巩蕾 |
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| 作者单位： | 1.西安电子科技大学 物理与光电工程学院, 西安 71 0071 ; |
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| 基金项目： | 国家自然科学基金项目，中央高校基本科研业务费专项资金项目 |
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| 摘 要： | 太赫兹(THz)波作为微波和毫米波的延伸,它所提供的通信带宽和容量远大于毫米波。在随机介质中传播时,不但会发生时域和空域的形变,介质中的粒子还会对入射波发生散射,这些都会使得脉冲信号发生衰减。根据Mie理论与随机离散分布粒子的波传播与散射理论,计算了THz波信号入射下雾滴粒子的消光系数。结合雾滴粒子谱分布,得到了雾媒质的平均体系散射特性,采用蒙特卡罗法得到了平流雾对THz信号的多重散射特性,计算了THz波段信号对平流雾的透过率与反射率,分析了THz波段信号的前向、后向散射特性随散射角的分布。结果表明,低能见度大气环境中,雾对THz波产生的吸收和衰减不容忽视。相关研究结果对THz在大气传输、通信等方面的应用具有重要意义。
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| 关 键 词： | 太赫兹波 雾 Mie理论 多重散射 蒙特卡罗法 |
| 收稿时间： | 2014-06-20 |
Multiple scattering characteristics of THz wave in fog |
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| Wang Rongrong,Wu Zhensen,Zhang Yanyan,Wang Mingjun,Gong Lei.Multiple scattering characteristics of THz wave in fog[J].High Power Laser and Particle Beams,2014,26(11):113101. |
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| Authors: | Wang Rongrong Wu Zhensen Zhang Yanyan Wang Mingjun Gong Lei |
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| Affiliation: | 1.School of Physics and Optoelectronic Engineering,Xidian University,Xi’an 710071,China;2.School of Physics and Electronic Engineering,Xianyang Normal College,Xianyang 712000,China;3.School of Photoelectric Engineering,Xi’an Technological University,Xi’an 710021,China |
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| Abstract: | As the extension of the microwave and millimeter-wave, the terahertz wave provides much greater communication bandwidth and capacity than millimeter wave. The THz pulses appeare the temporal and spatial deformation because of the waves scattered by the incident particles, and the pulses signal attenuation occurs. Based on the Mie theory, using the discrete distribution of particles with the random wave transmission and scattering theory, the extinction coefficient of fog droplet in the THz wave is calculated. Considering the fog particle spectral distribution, we obtain the average scattering characteristics with different incident wavelengths. The multiple scattering property of the THz signal from advection fog, e.g. the transmissivity and reflectivity, is investigated with Monte Carlo method. The forward and backward scattering intensities with the scattering angle by different visibility are analyzed. The result shows that in the atmospheric environment with a lower visibility, the absorption and attenuation caused by fog in terahertz wavelength can not be ignored. The research in the paper is of great significance to the space transmission and communication application of the terahertz technology. |
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| Keywords: | THz wave fog Mie theory multiple scattering Monte Carlo method |
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