【摘 要】
:
自适应系统在大口径望远镜的成像分辨率中起到至关重要的作用.但是由于明亮的自然导星天空覆盖率低而导致自适应系统受到限制.瑞利激光导星是利用一束向上发射的激光经过大气中瑞利层的后向散射创造出的人造信标,因此天空覆盖率理论上可达到百分之百.基于某一大气条件下设计出一套完善的瑞利导星自适应系统可为日后导星技术提供参考和支持.我们已经通过湍流理论分析出在长春地区瑞利激光导星最佳的发射口径,同时设计了一套完整
【机 构】
:
中国科学院长春光学精密机械与物理研究所
论文部分内容阅读
自适应系统在大口径望远镜的成像分辨率中起到至关重要的作用.但是由于明亮的自然导星天空覆盖率低而导致自适应系统受到限制.瑞利激光导星是利用一束向上发射的激光经过大气中瑞利层的后向散射创造出的人造信标,因此天空覆盖率理论上可达到百分之百.基于某一大气条件下设计出一套完善的瑞利导星自适应系统可为日后导星技术提供参考和支持.我们已经通过湍流理论分析出在长春地区瑞利激光导星最佳的发射口径,同时设计了一套完整并且实用的发射系统,利用湍流模拟分析得出后向散射光斑半径为0.84arcsec,与理论值的光斑半径0.82arcsec接近,该导星发射系统可根据实验时大气情况调节发散角,从而调节激光导星的大小,最终使得导星大小满足探测精度的要求.另一方面,瑞利激光导星自适应系统的导星接收部分正在进行中,导星接收部分起到接收并检验瑞利导星质量的作用,同时也可以完成瑞利激光导星自适应系统的波前探测任务.
其他文献
Nanomaterial-based signal-amplification strategies hold a great promise in realizing sensitive biological detection.[1-2] A simple label-free electrochemical immunosensor for sensitive detection of ca
Organogels or organic self-assemble nanostructures based on π-systems that have inherent electronic properties such as luminescence,charge carrier mobility,and electronic conductivity are extensively
Metal oxides are receiving an incremental attention in recent years for their potential applications in ablation of cancer cells due to their efficient photothermal conversion and good biocompatibilit
Polyoxometalates(POMs)are a class of discrete anionic metal oxides with intriguing physical properties and unmatched range of structures that can range in size from nano to micrometer scale.
Actinide oxide nanomaterials have drawn much attention recently,as they display many attractive properties that are very promising for applications as new types of nuclear fuels and highly efficient c
Titanium dioxide(TiO2)has been widely investigated for use in degradation of environment pollutants because of its light active property that may utilize the clean energy of sunlight to drive the phot
NiO nanoparticles(NPs)and 5,10,15,20-tetrakis(4-carboxyl pheyl)-porphyrin(H2TCPP)functionalized NiO nanoparticles(H2TCPP-NiO nanocomposites)have been prepared by a facile method and characterized by p
自从1973年Levy和Boudart1报道了碳化物具有类似贵金属的电子结构和催化特性以来,过渡金属碳化物作为一种新材料已引起了人们的极大兴趣。过渡金属碳化物(TMCs)是由碳和金属所形成的“间充性合金”,其制备通常都需要较高的反应温度和较长的反应时间,而且制得的产物颗粒尺寸较大,一般在微米范围,形貌和尺寸难以调控,这种情况严重阻碍了过渡金属碳化物的广泛应用。
有序介孔材料由于其具有特有的组成和结构,可控的孔径,较高的比表面积而受到广泛的关注。近年来,介孔材料的合成已由硅基介孔材料向非硅基金属氧化物材料延伸。尽管常规元素有序介孔金属氧化物的合成方法已日渐成熟,但是将相应的合成方法应用于合成锕系元素氧化物的有序介孔结构还未见报道。
Micro/nano magnetic materials have been of great interest over the past several years for the fundamental understanding of micro/nano-magnetism and for their technological applications.In particular,a