太赫兹波在Kolmogorov湍流大气中的水平传输特性研究  

Transmission Characteristics of Terahertz Wave in Kolmogorov Turbulent Atmosphere

作　　者：曾曙光[1] 但有全[2] 刘雁[1] 王飞[1] 

机构地区：[1]三峡大学理学院,湖北宜昌443002 [2]中国民航飞行学院,四川广汉418307

出　　处：《红外》2015年第6期7-12,共6页Infrared

基　　金：国家自然科学基金(11347117);三峡大学优秀人才科研启动基金(KJ2011B066)

摘　　要：太赫兹的大气传输特性对太赫兹的空间应用非常重要。对太赫兹波在Kolmogorov湍流大气中的水平传输特性展开了研究。分析了太赫兹平面波在湍流大气中传输时其闪烁指数、饱和距离等参数随频率、空间传输距离和湍流强弱程度等因素的变化。以高斯波束为例,研究了太赫兹波束在湍流大气中传输时闪烁指数、束宽等参数随传输距离等物理量的演化规律。研究结果表明,在太赫兹波段,频率越高,闪烁指数越大,饱和距离就越小。总体上看,太赫兹波在大气中传输时受大气湍流的影响程度介于光波和微波之间;对于太赫兹大气通信和成像等短程应用,太赫兹波在湍流大气中传输时一般都处于弱起伏状态;但对于太赫兹雷达和遥感等应用,由于传输距离较远,可能会出现强起伏。The transmission characteristics of terahertz （THz） wave in turbulent atmosphere are very important for the application of THz wave in space. The horizontal transmission characteristics of THz wave in Kolmogorov turbulence atmosphere are studied. The variation of scintillation index and saturated distance of THz plane wave with the frequency, transmission distance and turbulence intensity in turbulent atmosphere is analyzed. Taking the Guassian beam as an example, the variation of the scintillation index and beam width of THz wave beams with the transmission distance in turbulence atmosphere is studied. The results show that in the THz wave band, the higher the frequency of THz wave is, the greater the scintillation index is and the shorter the saturated distance is. In general, when THz wave is transmitting in atmosphere, the influence of turbulence on it is between that on optical wave and that on microwave. For the short-range applications such as communication and imaging, THz wave is mostly in the state of weak fluctuation. But for the long-range applications such as THz radar and imaging, THz wave is in the state of strong fluctuation.

关 键 词：大气光学 太赫兹 湍流大气 传输 闪烁指数 

分 类 号：O436[机械工程—光学工程]