中国科学院机构知识库网格
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激光频率梳同步定标的千万分辨率VIPA光谱装置设计及应用(特邀) 期刊论文  OAI收割
光子学报, 2020, 卷号: 49, 期号: 11
作者:  
朱小明;  何晋平
  |  收藏  |  浏览/下载:32/0  |  提交时间:2021/12/06
Numerical study of comb-based high-accuracy distance measurement utilizing VIPA interferometry 期刊论文  OAI收割
Journal of Optics, 2019, 卷号: 21, 期号: 2, 页码: 105645.R1-1-9
作者:  
Zhu XM(朱小明);  He JP(何晋平)
  |  收藏  |  浏览/下载:30/0  |  提交时间:2020/02/03
Terahertz FSS for space borne passive remote sensing application 期刊论文  OAI收割
ELECTRONICS LETTERS, 2013, 卷号: 49, 期号: 22, 页码: 1398-1399
作者:  
Xia, Bu Gang;  Zhang, De Hai;  Meng, Jin;  Huang, Jian;  Yao, Chang Fei
收藏  |  浏览/下载:63/0  |  提交时间:2014/05/04
aerospace instrumentation  antenna arrays  circular waveguides  electromagnetic wave polarisation  frequency selective surfaces  geophysical equipment  radiometers  receiving antennas  remote sensing  resonators  spatial filters  submillimetre wave devices  terahertz wave devices  terahertz metamaterials  frequency 0  1 THz to 0  5 THz  Earth observation radiometers  space-borne passive remote sensing application  scanning antenna  split ring resonator  subwavelength circular ring  micromachined metallic pattern  periodic aperture unit cells  ultra-thin high conductivity aluminium layer  quartz wafer  FSS array  incident angle variation  polarisation variation  high sensitivity receiver  spatial filtering front-end  terahertz FSS metamaterial  terahertz frequency selective surface  
Study on ultra-light secondary baffle for coaxial two-mirror telescope (EI CONFERENCE) 会议论文  OAI收割
2012 9th IEEE International Conference on Mechatronics and Automation, ICMA 2012, August 5, 2012 - August 8, 2012, Chengdu, China
作者:  
Zhang L.;  Zhang L.
收藏  |  浏览/下载:74/0  |  提交时间:2013/03/25
The coaxial two-mirror telescope consists of two mirrors facing each other. Classical two-mirror arrangements are Gregorian and Cassegrain. These systems are usually applied to space telescopes and often have optical baffles to prevent stray light from entering the focal plane. The optical baffles consist of concentric rings suspended between the secondary and the primary mirror. The secondary baffle for a large two-mirror optical system is designed and analyzed in this paper. According to mission of a telescope  the structure should have high stiffness and high reliability and light weight. Compared with invar  aluminum alloy and titanium alloy  carbon fiber composite is currently the best material in terms of weight-to-strength ratio. It also has advantages of high temperature tolerance and low thermal expansion. So carbon fiber composite is chosen as material to meet requirements of the coaxial telescope. In this paper  optimization method based on finite element analysis (FEA) is used for design the secondary baffle. Minimum weight of the baffle is chosen as an objective function. Thicknesses of former tube and vanes are chosen as variables. Analysis results show that the designed secondary baffle has maximum diameter of 180mm  total length of 120mm and weighs 142g. And its fundamental frequency reaches 651Hz. Therefore the baffle has many advantages  such as ultra-light weight  high stiffness and dimensional stability  etc. The optimization method and the baffle design can be helpful to other coaxial telescopes  such as Cassegrain  Gregorian and their subdivisions. 2012 IEEE.  
A 300 hz two-stage pulse tube cryocooler that attains 58 k 期刊论文  iSwitch采集
Cryogenics, 2010, 卷号: 50, 期号: 8, 页码: 469-471
作者:  
Cai, Huikun;  Yang, Luwei;  Luo, Ercang;  Zhou, Yuan
收藏  |  浏览/下载:40/0  |  提交时间:2019/05/10