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浏览/检索结果: 共15条，第1-10条 帮助

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Lattice distortion and magnetic property of high entropy alloys at low temperatures 期刊论文  OAI收割
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY, 2022, 卷号: 104, 页码: 236-243
作者:  Tan, Yuan-Yuan;  Chen, Zhong-Jun;  Su, Ming-Yao;  Ding, Gan;  Jiang, Min-Qiang
  |  收藏  |  浏览/下载：66/0  |  提交时间：2022/05/17
Athermalization of star sensor optical system with large field of view and low distortion 会议论文  OAI收割
ELECTR NETWORK, 2022-11-24
作者:  Wang Xingyan;  Wang Hu;  Shen Yang;  Ma Zehua;  Yan Haoyu
  |  收藏  |  浏览/下载：14/0  |  提交时间：2023/06/19
A wide-band collimator with large field of view and low distortion 会议论文  OAI收割
Guangzhou, China, 2020-11-20
作者:  Zhang, Xuemin;  Dai, Yidan;  Song, Xing;  Li, Hua
  |  收藏  |  浏览/下载：34/0  |  提交时间：2021/04/20
Design of a double-telecentric optical system based on machine vision 会议论文  OAI收割
Shanghai, China, 2020-06-29
作者:  Wu, Tiantian;  Ma, Xiaolong
  |  收藏  |  浏览/下载：31/0  |  提交时间：2020/12/29
Ultra-low-distortion optical system design based on tolerance sensitivity optimization 期刊论文  OAI收割
Optics Communications, 2019, 卷号: 437, 页码: 231-236
作者:  K.Zhang;  X.Zhong;  W.Wang;  Y.Meng;  J.Liu
  |  收藏  |  浏览/下载：36/0  |  提交时间：2020/08/24
The design of visible system for improving the measurement accuracy of imaging points 会议论文  OAI收割
Nanjing, PEOPLES R CHINA, 2017-10-24
作者:  Shan, Qiu-sha;  Li, Gang;  Zeng, Luan;  Liu, Kai;  Yan, Pei-pei
  |  收藏  |  浏览/下载：37/0  |  提交时间：2018/07/05
Low complexity encoder optimization for HEVC 期刊论文  OAI收割
JOURNAL OF VISUAL COMMUNICATION AND IMAGE REPRESENTATION, 2016, 卷号: 35, 页码: 120-131
作者:  Wang, Shanshe;  Luo, Falei;  Ma, Siwei;  Zhang, Xiang;  Wang, Shiqi
  |  收藏  |  浏览/下载：41/0  |  提交时间：2019/12/13
Optimal rate-distortion based unequal error protection in the transmission electrocardiograph signal 会议论文  OAI收割
IEEE Workshop on Electronics, Computer and Applications (IWECA), Ottawa, CANADA, 2014-05-08
作者:  Fan, ML;  Cai, J;  Dong L(董亮);  Li, BL;  Zhou, Y
收藏  |  浏览/下载：33/0  |  提交时间：2016/04/08
Research on automatic Hartmann test of membrane mirror (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:  Zhang P.
收藏  |  浏览/下载：31/0  |  提交时间：2013/03/25
Electrostatic membrane mirror is ultra-lightweight and easy to acquire a large diameter comparing with traditional optical elements  so its development and usage is the trend of future large mirrors. In order to research the control method of the static stretching membrane mirror  the surface configuration must be tested. However  membrane mirror's shape is always changed by variable voltages on the electrodes  and the optical properties of membrane materials using in our experiment are poor  so it is difficult to test membrane mirror by interferometer and null compensator method. To solve this problem  an automatic optical test procedure for membrane mirror is designed based on Hartmann screen method. The optical path includes point light source  CCD camera  splitter and diffuse transmittance screen. The spots' positions on the diffuse transmittance screen are pictured by CCD camera connected with computer  and image segmentation and centroid solving is auto processed. The CCD camera's lens distortion is measured  and fixing coefficients are given to eliminate the spots' positions recording error caused by lens distortion. To process the low sampling Hartmann test results  Zernike polynomial fitting method is applied to smooth the wave front. So low frequency error of the membrane mirror can be measured then. Errors affecting the test accuracy are also analyzed in this paper. The method proposed in this paper provides a reference for surface shape detection in membrane mirror research. 2010 Copyright SPIE - The International Society for Optical Engineering.  
Manufacture of 1.2m reaction bonded silicon carbide mirror blank CFID (EI CONFERENCE) 会议论文  OAI收割
5th International Symposium on Advanced Optical Manufacturing and Testing Technologies: Large Mirrors and Telescopes, April 26, 2010 - April 29, 2010, Dalian, China
作者:  Zhang G.;  Zhang G.;  Zhang G.
收藏  |  浏览/下载：29/0  |  提交时间：2013/03/25
Silicon carbide (SiC) is a new type candidate material for large-scale lightweight space mirror. Its low thermal distortion  high stiffness  fine optical quality and dimensional stability  make SiC an ideal material for large space born telescope. Since ten years Changchun institute optics  fine mechanics and physics (CIOMP) has developed reaction bonded SiC (RB-SiC) technology for space application  and can fabricate RB-SiC mirror with scale less than 1.0 meter for telescope. The green body is prepared with gel-casting method which is an attractive new ceramic forming process for making high-quality  complex-shaped ceramic parts. And then unmolding  drying  binder burning out  reacting bonded  the RB-SiC can be obtained. But with the development of space-born or ground telescope  the scale of primary mirror has exceeded 1.0 meter. So CIOMP has developed an assembly technique which called novel reaction-formed joint technology for larger RB-SiC mirror blank. The steps include joining of green bodies with mixture comprised of SiC particles and phenolic resin etc  firing  machining and sintering. Joining the 1.2 meter RB-SiC mirror blank by the novel reaction-formed joint technology. And testing the welding layer's performance  the results show that the thickness of 54-77m  the microstructure and thermal property can be comparable to the substrate and the mechanical property are excellent in bending strength of 307MPa. 2010 Copyright SPIE - The International Society for Optical Engineering.