太赫兹波在雾中的多重散射特性

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。

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.

参考文献

[1] 姚建铨, 汪静丽, 钟凯, 等. THz辐射大气传输研究和展望［J］.光电子激光, 2010, 21 (10):1582-1588.（Yao Jianquan, Wang Jingli, Zhong Kai, et al. Study and outlook of THz radiation atmospheric propagation. Journal of Optoelectronics·Laser, 2010, 21 (10):1582-1588）

[2] 崔海霞. 太赫兹传输及传感若干问题的研究［D］. 长春：长春理工大学, 2011.(Cui Haixia. The study on some questions of transmission and sensing with terahertz wave. Changchun: Changchun University of Science and Technology,2011:11-19)

[3] Dougherty H T, Dutton E J. Estimating yeartoyear variability of rainfall for microwave applications［J］. IEEE Trans on Communications, 1978, 26(8): 1321-1324.

[4] Liebe H J. MPMan atmospheric millimeterwave propagation model［J］. International Journal of Infrared and Millimeter Waves,1989,10(6):632-642.

[5] Pardo J R, Cernicharo J, Serabyn E. Atmospheric transmission at microwaves(ATM): An improved model for millimeter/sub millimeter applications［J］. IEEE Trans on Antennas and Propagation,2001,49(12):1683-1695.

[6] 陈秀红,魏合理.可见光到远红外波段气溶胶衰减计算模式［J］. 强激光与粒子束, 2009, 21(2):183-189.(Chen Xiuhong, Wei Heli, Calculating model for aerosol extinction from visible to far infrared wavelength. High Power Laser and Particle Beams, 2009,21(2):183-189)

[7] 赵振维,吴振森.水凝物的电波传播特性与遥感研究［D］. 西安:西安电子科技大学,2001:73-82.(Zhao Zhenwei, Wu Zhensen. Study on radio wave propagation characteristics and remote sensing of hydrometeors. Xi’an: Xidian University, 2001:78-82)

[8] 姚建铨.太赫兹技术及其应用［J］.重庆邮电大学学报：自然科学版,2010,22(6):703-707.(Yao Jianquan. Introduction of THzwave and its applications. Journal of Chongqing University of Posts and Telecommunications: Natural Science Edition 2010,22(6):703-707)

[9] 李宇晔,李福利.模拟沙尘暴条件下的太赫兹辐射传输研究［J］. 激光与红外, 2008,38(9):921-924.(Li Yuye, Li Fuli. The transmission characters of terahertz radiation to stimulate sanddust storm. Laser & Infrared, 2008,38(9):921-924)

[10] 龚冰.毫米波/亚毫米波目标辐射特性及探测技术研究［D］. 南京:南京理工大学, 2009:93-96.(Gong Bing. Research on MMW/SMMW objects radiation characteristic and detection technology. Nanjing:Nanjing University of Science and Technology, 2009:93-96)

[11] 黄时光.太赫兹波传输特性研究［D］. 西安:西安电子科技大学, 2010:3032.(Huang ShiGuang. Study on the transmission characteristic of terahertz wave. Xi’an:Xidian University, 2010:30-32)

[12] 王瑞.激光在雾媒质中的传播衰减特性研究［D］. 西安:西安电子科技大学, 2007:35-37(Wang Rui. Study on the characteristics of laser propagation and attenuation through the fog. Xi’an: Xidian University,2007:35-37)

[13] Bothren C F, Huffman D R. Absorption and Scattering of Light by Small Particles［M］.New York:Wiley,1998.

[14] Kokhanovsky A A, Zege E P. Optical properties aerosol particles: a review of Approximate analytical solution ［J］. Aerosol Science, 1997, 28(1):1-21.

[15] 吴振森, 王一平. 直接模拟法和统计估计法研究平面波通过离散随机介质的散射［J］. 物理学报,1988,37(4):698-704.(Wu Zhensen, Wang Yiping. Study of scattering of plane wave through discrete random medium by direct analogue and statistical estimation. Acta Physica Sinica, 1988,37(4):698-704)

[16] Wu Zhensen, Yan Yi. Chen Lihong. Monte Carlo simulation for millimeter wave propagation and scattering in rain medium ［J］.International J Infrared and Millimeter Waves, 1992, 13(7):981-994.

[17] 李涵宇,董志伟,周海京,等.太赫兹电磁波大气吸收衰减逐线积分计算［J］.强激光与粒子束,2013,25(6):1445-1449.(Li Hanyu, Dong Zhiwei, Zhou Haijing, et al. Calculating of atmospheric attenuation of THz electromagnetic wave through line by line integral. High Power Laser and Particle Beams,2013,25(6):1445-1449)

[18] 周逊,李赜宇,罗振飞,等.太赫兹大气传输特性实验研究［J］.强激光与粒子束,2013,25(6):1573-1576.(Zhou Xun, Li Zeyu, Luo Zhenfei, et al. Experimental research of THz radiation’s characteristics of atmospheric transmission. High Power Laser and Particle Beams,2013, 25(6):1573-1576)

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. 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.

太赫兹波在雾中的多重散射特性

关于本站 Cookie 的使用提示

全站搜索

太赫兹波在雾中的多重散射特性

相关论文

相关资讯

关于本站 Cookie 的使用提示

全站搜索