| 对称非球形冰晶对太赫兹波的衰减效应 |
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| 引用本文： | 王玉文,董志伟.对称非球形冰晶对太赫兹波的衰减效应[J].太赫兹科学与电子信息学报,2017,15(3):345-348. |
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| 作者姓名： | 王玉文 董志伟 |
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| 作者单位： | Graduate School of China Academy of Engineering Physics，Beijing 100088，China and 1.Microsystem and Terahertz Research Center，China Academy of Engineering Physics，Mianyang Sichuan 621999，China；2.Institute of Applied Physics and Computational Mathematics，Beijing 100094，China |
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| 基金项目： | 中国工程物理研究院微系统与太赫兹研究中心资助项目 |
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| 摘 要： | 水汽凝结体对太赫兹波在大气中的传输衰减起重要作用。结合T-matrix方法，数值模拟了云层中非球形冰晶在太赫兹波段的吸收和散射效应，建立了对称性非球形冰晶的太赫兹波衰减统计模型。分析了不同结构的非球形冰晶的消光特性，对比MPM模型的球形水云衰减，结果显示太赫兹波段对称非球形冰晶的散射特性明显，衰减效应强于球形水滴，衰减系数平均为20 dB左右，1 THz以上消光截面随冰晶形状的变化而变化，为太赫兹星地通信提供了参考数据。
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| 关 键 词： | 太赫兹波 对称非球形冰晶 衰减 T-matrix方法 |
| 收稿时间： | 2016/10/11 0:00:00 |
| 修稿时间： | 2016/11/15 0:00:00 |
Nonspherical symmetric ice crystal attenuation for terahertz wave |
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| WANG Yuwen and DONG Zhiwei.Nonspherical symmetric ice crystal attenuation for terahertz wave[J].Journal of Terahertz Science and Electronic Information Technology,2017,15(3):345-348. |
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| Authors: | WANG Yuwen and DONG Zhiwei |
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| Abstract: | Significant research efforts have been carried out so far to develop models for the prediction of cloud effects on earth-space links in terahertz frequency. A statistic attenuation model for terahertz wave is presented with T-matrix method of nonspherical symmetric ice crystal. The scattering and absorption coefficients are calculated and analyzed on the basis of the microphysical data. By using the results of highly accurate T-matrix computations for circular cylinder particles with varying degrees of diameter-to-length ratios, the effects of a deviation of ice crystal shapes for terahertz wave are analyzed. Our results imply that numerical averaging of extinction characteristics of real cloud ice crystal over sizes may rely on a significantly coarser size-parameter resolution. |
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