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	Self-Focusing Property of Partially Coherent Beam With Non-Uniform Correlation Structure in Non-Linear Media 期刊论文 OAI收割 FRONTIERS IN PHYSICS, 2022, 卷号: 9 作者: Lu, Lu; Wang, Zhiqiang; Yu, Jiayi; Qiao, Chunhong; Lin, Rong \| 收藏 \| 浏览/下载：46/0 \| 提交时间：2022/02/21 partially coherent beam non-uniform correlation structure optical coherence coherence radius self-focusing length
	Fabrication and cold test of prototype of spatially periodic radio frequency quadrupole focusing linac 期刊论文 OAI收割 NUCLEAR SCIENCE AND TECHNIQUES, 2021, 卷号: 32, 期号: 1, 页码: 9 作者: Yu, Pei-Yan; Zhang, Bin; Wang, Feng-Feng; Li, Chen-Xing; Sun, Guo-Zhen \| 收藏 \| 浏览/下载：28/0 \| 提交时间：2021/12/10 Spatially periodic RF quadrupole focusing linac Mechanical structure design Bead-pull measurement
	Menger fractal structure with negative refraction and sound tunnelling properties 期刊论文 OAI收割 Materials Research Express, 2019, 卷号: 6, 期号: 11 作者: Liu Y(刘宇); Xu WS(徐文帅); Chen M(陈猛); Pei DL(裴东亮); Yang T(杨涛) \| 收藏 \| 浏览/下载：51/0 \| 提交时间：2019/11/26 Menger fractal structure negative refraction acoustic focusing sound tunnelling
	A Focusing Mechanism Based on Flexible Hinges for Space Telescope 会议论文 OAI收割 Qingdao, PEOPLES R CHINA, 2019-05-19 作者: Ma, Xiaozhe; Li, Chuang; Cheng, Penghui; Hu, Bin \| 收藏 \| 浏览/下载：35/0 \| 提交时间：2020/03/04 Focusing mechanism Structure design Worm gear reducer Flexible hinge Modal analysis
	The analyze and design of focusing system for space camera (EI CONFERENCE) 会议论文 OAI收割 2012 International Conference on Electrical Insulating Materials and Electrical Engineering, EIMEE 2012, May 25, 2012 - May 27, 2012, Shenyang, Liaoning, China 作者: Yu T. 收藏 \| 浏览/下载：32/0 \| 提交时间：2013/03/25 In order to control the focal plane and guarantee the imaging quality of space camera the focusing system was proposed. Firstly the reasons of defocusing were analyzed and a solution method was given. Secondly the system structure and operating principle were introduced. Thirdly the system design was presented in detail. Finally the system was experimented. Experimental results indicate that the defocusing amount of camera can be controlled below 10 um and the focusing system satisfies the requirement of system design. (2012) Trans Tech Publications Switzerland.
	Study on spectrograph for ionosphere: A broadband imaging instrument prototype for far-ultraviolet (EI CONFERENCE) 会议论文 OAI收割 International Symposium on Photoelectronic Detection and Imaging 2011: Space Exploration Technologies and Applications, May 24, 2011 - May 26, 2011, Beijing, China 作者: Wang S.-R.; Lin G.-Y.; Yu L. 收藏 \| 浏览/下载：39/0 \| 提交时间：2013/03/25 Current research on space-based exploration for the ionosphere needs more advanced technologies. Because the spectral signals in the ionosphere distributing basically in the far-ultraviolet waveband are very weak. Usual spectrometer structures and detectors such as CCD can't receive enough information. Based on this principle of atmospheric sounding the imaging spectrometer prototype for ionosphere detection application was designed to solve the problem. This prototype consists of the telescope and the imaging spectrometer. The simple structure and small number of mirrors can help higher transmission efficiency be achieved and weak signals detection be implemented. The telescope is an off-axis parabolic mirror and the spectrometer is a modified Czerny-Turner spectral imaging system. Modified Czerny-Turner spectrometer contains a spherical mirror a fixed plane grating and a toroidal mirror. By adjusting the incident angle to the collimating mirror and using toroidal mirror coma and astigmatism were corrected well. We also optimize distances between the grating to the focusing mirror and the focusing mirror to the image plane to improve disadvantages of traditional Czerny-Turner structure. Designed results demonstrate that aberrations are substantially corrected and high image quality can be obtained in broad waveband. The photon counting Wedge-Strip-Anode detector with micro-channel planes as the receiving plane is accepted for the instrument prototype. The other photon counting 2-D detector responding well for weak light such as Cross-Delay line detector and MAMA detector can also be used for detection. The calibration and performances testing system is made of a vacuum system a deuterium lamp a monochrometer and the instrument prototype. Results obtained from the experiment show that the spectral resolution is 2.4 nm and the spatial resolution is 80 m. The other calibration experiments are running. The technology of the spectrometer prototype is important for the research and applications of ionosphere remote sensing. 2011 SPIE.
	Design and analysis of auto-focus assembly for spaceborne remote sensing camera (EI CONFERENCE) 会议论文 OAI收割 2011 International Conference on Electronics, Communications and Control, ICECC 2011, September 9, 2011 - September 11, 2011, Ningbo, China 作者: Chen W.; Gao X. 收藏 \| 浏览/下载：33/0 \| 提交时间：2013/03/25 Spaceborne remote sensing camera may be out of focus when the environment and photographic distance changes. In order to get higher ground sampled distance for the camera based on the experience gained from the development of a remote sensing camera working principle of auto-focus assembly control system was discussed. Time of waveform extraction was reduced. It sets force an auto-focus assembly that uses cam and line guide rail in order to move the lens group. The motion error of the auto-focus assembly was difficult to be eliminated and would affect on the focusing accuracy of the spaceborne remote sensing camera directly. So it was analyzed at both ends of the focusing structure. The CCD detector can keep stable when the remote sensing camera is imaging. The motion error was tested to verify the validity of the simulation result and it is less than 0.01mm. Its accuracy meets using demand. The focusing method of moving focal plane is suitable for spaceborne remote sensing camera. 2011 IEEE.
	Application of precision harmonic gear drive in focusing mechanism of space camera (EI CONFERENCE) 会议论文 OAI收割 5th International Symposium on Advanced Optical Manufacturing and Testing Technologies: Smart Structures and Materials in Manufacturing and Testing, April 26, 2010 - April 29, 2010, Dalian, China 作者: Zhang X.; Zhang X.; Zhang X. 收藏 \| 浏览/下载：31/0 \| 提交时间：2013/03/25 A kind of precision harmonic gear drive in the focusing mechanism of space camera is studied which adopt external meshing complex wave transmission mode. Wave generator is combined with an elliptic cam and a flexible bearing around it. Flexspline is a structure of single wave with the same teeth. The output shaft is supported by a single cross-roller bearing. Ball screws connected the output shaft translate the rotational motion to the linear motion and drive the focusing mirror repeated moving along the linear guide. The output rigid wheel is connected with absolute encoder to detect displacement of focusing movement. It has the characteristics of big transmission ratio high precision compact structure high efficiency and smooth running etc. According to the practical application of this harmonic gear drive in the space camera the location relationship between the displacement of focusing structure and the focal plane movement is derived and the system error is analyzed its accuracy is tested with the open-loop control method. Experimental results show that transmission ratio of the instrument is 1:70 repeated positional accuracy is 2m which meet the requirements for use. 2010 SPIE.
	Design and test of focusing mechanism of space camera (EI CONFERENCE) 会议论文 OAI收割 5th International Symposium on Advanced Optical Manufacturing and Testing Technologies: Design, Manufacturing, and Testing of Micro- and Nano-Optical Devices and Systems, April 26, 2010 - April 29, 2010, Dalian, China 作者: Li Y.; Li Y.; Li Y.; Wang H.; Wang H. 收藏 \| 浏览/下载：33/0 \| 提交时间：2013/03/25 According to the focal depth and work environment of a space camera a focusing mechanism is designed which consists of precision screw ball transmission and linear bearing guidance and accuracy improving. The dynamic- strike- resistance adaptability to temperature and vacuum are considered into the reliable design method. Furthermore the linearity error the structure stability and the mechanism work situation in high and low temperature are tested. The result is that the linearity error of the mechanism is less than 0.003 mm and the sway error of vertical way and level way of the mirror is less than 20''. The linearity error of the mechanism and the sway error of the mirror remain unchanged after vibration test. The mechanism can work in the complex space environment. 2010 SPIE.