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浏览/检索结果: 共8条，第1-8条 帮助 已选(0)清除 条数/页：5101520253035404550556065707580859095100   排序方式：请选择作者升序作者降序题名升序题名降序发表日期升序发表日期降序提交时间升序提交时间降序 Design and verification of the HXI collimator on the ASO-S mission 期刊论文 RESEARCH IN ASTRONOMY AND ASTROPHYSICS, 2021, 卷号: 21, 期号: 6 作者:  Chen, Deng-Yi;  Hu, Yi-Ming;  Ma, Tao;  Su, Yang;  Yang, Jian-Feng 收藏  |  浏览/下载：63/0  |  提交时间：2021/09/06 Solar observation  ASO-S  X-ray telescope  the collimator  verification   Experimental investigation on coherent beam combination of a three-element fiber array based on target-in-the-loop technique 期刊论文 ACTA PHYSICA SINICA, 2012, 卷号: 61, 期号: 3 作者:  Geng Chao;  Li Xin-Yang;  Zhang Xiao-Jun;  Rao Chang-Hui 收藏  |  浏览/下载：14/0  |  提交时间：2015/07/10 fiber array  coherent beam combination  target-in-the-loop  adaptive fiber optics collimator   Design of the real-time autofocusing system for collimator with long focus length and large aperture (EI CONFERENCE) 会议论文 2011 International Academic Conference on Numbers, Intelligence, Manufacturing Technology and Machinery Automation, MAMT 2011, December 24, 2011 - December 25, 2011, Wuhan, China Li X.; Zhang X. 收藏  |  浏览/下载：34/0  |  提交时间：2013/03/25 Large aperture collimator which has been widely used for calibrating and testing various optical devices plays an essential role in correlative laboratories. As being the basic testing and calibration equipment  the large aperture collimator's accuracy should be much higher than the device under testing in order to ensure the accuracy of the measurement. However  the process of adjusting the collimator is extremely complicated due to the collimator's large aperture and long focal length. So it is difficult to ensure the measurement's quality and easy to cause the system being vulnerable to the surrounding environment. One of the most common problems is defocus. In order to solve the problem above  this issue presents a new type of autocollimator autofocusing system which uses pentaprism instead of using large-aperture plane mirror  semiconductor lasers as light source and CCD sensor as receiver. The system is smaller  lighter  and more convenient when using. The computer simulation shows that the autofocusing system's resolution could reach the accuracy of 40m. If we use the relevant algorithms to execute the sub-pixel scanning  the resolution could reach the accuracy of 10m. It shows that the system could satisfy the required testing precision of testing large aperture optical device.   Resolution performance of extreme ultraviolet telescope (EI CONFERENCE) 会议论文 4th International Symposium on Advanced Optical Manufacturing and Testing Technologies: Optical Test and Measurement Technology and Equipment, November 19, 2008 - November 21, 2008, Chengdu, China Gao L.; Yang L.; Li D.-S.; Ni Q.-L.; Liang J.-Q.; Chen B. 收藏  |  浏览/下载：20/0  |  提交时间：2013/03/25 Extreme Ultraviolet Telescope (EUT) will image solar corona in four EUV narrow bandpasses defined by multilayered coatings deposited on normal incidence optics. In order to make sure it will get sub-arcsecond angular resolution in the mission we have to test its resolution performance on ground. The EUT is aligned by Zygo interferometer first and a global wavefront error of 0.152 peak to valley is obtained ( = 632.8nm ). Because of the difficulty of angular resolution test for EUT at its operating wavelengths  we test its optical performance at visible and UV band. The method is to place the resolution test-target on the focal plane of collimator and illuminate the target by visible and UV light espectively  then the collimated light will go through EUT and image at focal plane on CCD. By analysis of the images obtained in experiments we conclude that the angular resolution of EUT is 1.22 at visible light ( = 570nm ) which is very close to diffraction limit (1.20) and according to these results we estimate that the operational wavelength resolution is better than 0.32  meets design requirements. While for UV light  the angular resolution is 1.53 that is different from diffraction limit (0.53)  the error comes mainly from large pixel of EUV camera. 2009 SPIE.   Angular rate of test table based on high-speed non-contact measurement (EI CONFERENCE) 会议论文 9th International Conference on Electronic Measurement and Instruments, ICEMI 2009, August 16, 2009 - August 19, 2009, Beijing, China Yang L.; Shen X.; Zhang N.; Yang Y.; Zhao Y. 收藏  |  浏览/下载：28/0  |  提交时间：2013/03/25 This article will introduces a high-speed non-contact method that can measures the angular rate of a test table though an objective perspective. This method adopts a collimator tube that can be measured as a target fixed to the test table  and the target corresponds to the angular position of the test table. In the process of the table rotating  the camera will to keep track of the objective at a high speed. Due to the high sampling frequency of the high-speed camera  instantaneous angular rate of test table can be measured. With pixel subdivision technology  its measuring accuracy can be up to 0.02 pixels. We use this methods measured a low-speed test table's angular rate and analyzed the data. The error analysis shows when the rate of the test table is 0.20/s  the accuracy of the method can achieve 0.0220%. 2009 IEEE.   Analysis of spectrum narrowing of diode laser bar (EI CONFERENCE) 会议论文 Semiconductor Lasers and Applications III, November 12, 2007 - November 13, 2007, Beijing, China Deng X.; Liu Y.; Yin H.; Feng G.; Gu Y.; Wang L. 收藏  |  浏览/下载：7/0  |  提交时间：2013/03/25 Laser diode bar (LDB) are used increasingly often for many applications  but spectral bandwidth of LDB are generally approximately 2-4nm  far too wide for many demanding applications  e.g. spin-exchange optical pumping  terahertz generation  and lidar. External-cavity feedback can improve the spectral properties of LD or LDB. However  spectrum narrowing of LDB is more difficult than that of LD. Bar curvature (i.e. "smile") produced in the manufacturing process affects the spectrum narrowing greatly. By geometrical optics approach and ORIGIN software  smile which can be corrected by plano-convex cylindrical lens is simulated and the result is in good agreement with experiment. The selection of grating which is also a critical factor of spectrum narrowing will be stated. Finally  an external cavity consisting of fast axis collimator  two plano-convex cylindrical lens and a diffraction grating is used. The scheme is implemented on a 19-element LDB and yields 3-fold reduction in spectral linewidth under the situation that all optical elements in the system which are not optimized. Further  we use a slit in the experiment and analyze the spectrum narrowing of each element in LDB.   The structure design and packaging of the polarization-maintaining dual fiber collimator based on DFT (EI CONFERENCE) 会议论文 2005 Conference on High Density Microsystem Design and Packaging and Component Failure Analysis, HDP'05, June 27, 2005 - June 29, 2005, Shanghai, China Wang Z.; Qiu J. 收藏  |  浏览/下载：19/0  |  提交时间：2013/03/25 Examinable characteristic is an important parameter to measure and ensure the function and quality of the products. Based on the idea of DFA/M(Design For Assembly/Design For Manufacturability) and the method whether the target for low insertion loss and high reflection loss is implemented  the rational structure and assembly technics for the polarization-maintaining dual fiber collimator are discussed  and the packaging technology based on DFT of the polarization-maintaining dual fiber collimator is proposed. This method has been utilized in batch manufacture to enhance the efficiency and ensure the eligible ratio.   The packaging technology of optical switch arrays (EI CONFERENCE) 会议论文 ICO20: MEMS, MOEMS, and NEMS, August 21, 2005 - August 26, 2005, Changchun, China Zhao L.; Liang J.; Dong W.; Ming A.; Lan W.; Jin X.; Zhu W.; Wang W.; Le Z.; Chen W.; Wang L. 收藏  |  浏览/下载：13/0  |  提交时间：2013/03/25 Optical switch is one of key supporting technologies in all-optical-network (AON). And electrostatic MOEMS (Micro-Optical-Electro-Mechanical Systems) switch plays a very important role in all the researched switches  because of their excellent features  including low insertion  low crosstalk and scalability. But the packaging technology has been limiting the development of optical switch. In this paper  the authors study the laser beam propagating during the free space and select collimator  design the pedestal to packaging and address aspects of the insertion loss that are most important loss mechanisms for the 2D cross-connect switch.