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A Design Method for Reducing the Number of Actuators of a Large Active Main Reflector Antenna 会议论文  OAI收割
Liuzhou, China, December 16, 2021 - December 19, 2021
作者:  Qin, Long;  Lian, Peiyuan;  Li, Shuai;  Yan, Yuefei;  Xue, Song
  |  收藏  |  浏览/下载：16/0  |  提交时间：2023/06/28
Design and fabrication of CGH for aspheric surface testing and its experimental comparison with null lens (EI CONFERENCE) 会议论文  OAI收割
5th International Symposium on Advanced Optical Manufacturing and Testing Technologies: Optical Test and Measurement Technology and Equipment, April 26, 2010 - April 29, 2010, Dalian, China
作者:  Zhao J.;  Zhang X.;  Zhang X.;  Zhang X.;  Li F.
收藏  |  浏览/下载：34/0  |  提交时间：2013/03/25
Computer-generated hologram (CGH) is an effective way to compensate wavefront in null test of aspheric surfaces and freeform surfaces. Our strategies of CGH design and fabrication for optical testing are presented  and an experiment demonstrating the compensation results of CGH and null lens is also reported. In order to design complex CGH  software was developed  with which we can design a CGH including three sections: main section for compensating wavefront in null test  alignment section for adjusting the relative position between CGH and interferometer  and fiducial section for projecting fiducial marks around the optics under test. The design result is represented in GDS II format file which could drive a laser-direct-writer- machine to fabricate a photomask. Then  a 1:1 replication process is applied to duplicate the patterns from photomask to a parallel optical substrate whose surface is error better than /60 rms. Finally  an off-axis aspheric surface was tested with CGH and null lens respectively. The test result with CGH (0.019rms) is almost the same as the result with null lens (0.020 rms). This experiment also demonstrated that fiducial marks projected by CGH can be used to guide the alignment of the optics and measurement of its off-axis distance. 2010 Copyright SPIE - The International Society for Optical Engineering.  
improving the roi of software quality assurance activities: an empirical study 会议论文  OAI收割
International Conference on Software Process, ICSP 2010, Paderborn, Germany, 44020
Li Qi; Shu Fengdi; Boehm Barry; Wang Qing
  |  收藏  |  浏览/下载：20/0  |  提交时间：2011/03/31
Estimating Long-Term Changes in China's Village Landscapes SCI/SSCI论文  OAI收割
2009
Ellis E. C.; Neerchal N.; Peng K.; Xiao H. S.; Wang H. Q.; Yan Z. A.; Li S. C.; Wu J. X.; Jiao J. G.; Hua O. Y.; Cheng X.; Yang L. Z.
收藏  |  浏览/下载：25/0  |  提交时间：2012/06/08
Super-resolved imaging system with oversampling technology (EI CONFERENCE) 会议论文  OAI收割
3rd International Symposium on Advanced Optical Manufacturing and Testing Technologies, AOMATT 2007: Advanced Optical Manufacturing Technologies, July 8, 2007 - July 12, 2007, Chengdu, China
作者:  Zhang X.;  Wang L.-J.;  Wang L.-J.;  Zhang J.-P.;  Liu Y.
收藏  |  浏览/下载：56/0  |  提交时间：2013/03/25
It has been a significant issue in the imaging filed to provide the highest possible resolution of an electro-optical imaging system(E-O imaging system). CCD arrays are inherently undersampled and spatial frequency above Nyquist frequency is distorted so as to create ambiguity and Moire patterns for targets imaged by E-O system.. As to this drawback  a system-design project is introduced and discussed in the paper. It's well known that many image quality metrics are linked to MTF. However  CCDs don't satisfy MTF condition  namely  the shift-invariant property  so MTF synthesis can't appraise the whole system simply by the MTF product of the few sub-system ones in E-O imaging system. Then it is depicted how to solve this problem in the following. Finally the analyses and comparisons of the imaging performance parameters with and without super-resolved technologies are shown.  
一种将设计模式用于程序精化演算的并行程序设计方法研究 期刊论文  OAI收割
计算机研究与发展, 2003, 卷号: 40, 期号: 2, 页码: 318-324
万剑怡; 孙永强; 薛锦云
  |  收藏  |  浏览/下载：22/0  |  提交时间：2011/07/29