【摘要】 本文对紫外日盲区光谱在近距离、保密通信中的应用进行了探讨 ,并建立了紫外光学通信原理实验系统。所描述的系统是以日盲区紫外光作为信息载体的 ,用被调制的低压汞蒸汽紫外放电灯作为发射器件 ,以日盲型滤光片和光电倍增管或日盲型紫外光电倍增管作为接收器件 ,以达到在任何时间和在任何气候下完成窄频带模拟或低速数字信号的传输。由于近地表大气臭氧层的吸收 ,所以传输距离被限制在一个较小的范围内 ,构成了短距离的、秘密的、安全的和抗干扰的通信系统 ,并且不需要传统意义上的天线。由于地球大气上层臭氧的吸收作用 ,阳光中的日盲区 (2 0 0～ 2 80 nm)辐射几乎无法到达地球表面 ,因此 ,采用这个波段的光学通信系统几乎不会受到太阳光的干扰。典型的大气臭氧浓度高度分布大约在距地表 2 5 km处达到最高值 ,在海平面处有一个较低的值。相对较低的浓度值来说 ,虽然紫外辐射传输有限 ,但是具有足够远的距离 ,同时可达到安全、秘密和抗干扰的目的更多还原

【Abstract】 In this paper, the application of sun blind region ultraviolet spectrum in short range cryptical communication is discussed, and an experimental system of ultraviolet communication is constructed. In the described system, in order to transmit the narrow band analog signals or low speed digital signals at any time and under any climatic condition, sun blind region ultraviolet is used as information carrier, the modulated low voltage mercury vapor lamp is used as emission device. Due to the absorption of ozonosphere existing in near ground atmosphere, the transmission distance is limited in a shorter range, therefore a shortlegged, cryptical, safe and antijamming communication system is constructed, and the conventional antenna is not needed. Because of the absorption of ozonosphere existing in higher level atmosphere,the sun blind region ultraviolet radiation (200～280nm) of solar spectrum could hardly reach the surface of the earth. Therefore, the communication system using this spectral coverage could hardly be disturbed. The ozone concentration peaks at the height of 25km above the earth, and descends to a very low value at sea level. As to a lower concentration, though the transmission distance of ultraviolet is tinite, it is far enough to implement our application. Above all, it’s safe, cryptical and anti jamming.更多还原