QQ客服 官方微博 反馈留言

浏览/检索结果: 共8条，第1-8条 帮助 限定条件 发表日期：2012     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 Research on large aperture telescope drive control technology 会议论文 Amsterdam, Netherlands, 2012-7-1 Xiaoyan Li; Daxing Wang; Xiaoli Song; Changzhi Ren; Zhenchao Zhang 收藏  |  浏览/下载：18/0  |  提交时间：2014/01/12 large aperture telescope  drive control technology   Design of a Dual-Channel Mach-Zehnder Lateral Shearing Interferometer for the Large Aperture Static Imaging Spectrometer 期刊论文 spectroscopy and spectral analysis, 2012, 卷号: 32, 期号: 2, 页码: 553-557 作者:  Fu Qiang;  Xiangli Bin;  Lu Qun-bo 收藏  |  浏览/下载：20/0  |  提交时间：2015/07/01 Large aperture static imaging spectrometer  Fourier transform imaging spectrometer  Mach-Zehnder interferometer  Lateral shear   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.   Optimization analysis for radial support by finite elements method (EI CONFERENCE) 会议论文 2012 International Conference on Intelligent System and Applied Material, GSAM 2012, January 13, 2012 - January 15, 2012, Taiyuan, Shanxi, China Li C.; Wang Y. 收藏  |  浏览/下载：15/0  |  提交时间：2013/03/25 Primary mirror' surface figure is affected by supporting structure obviously. Especially for large-aperture telescope  the surface figure is significant because of primary mirror' self-weight. For the requirement of the usage  it's necessary to minimize the surface figure from self-weight by reasonable supporting scheme. The text optimized support point and force of radial support to minimize the surface figure by finite-element software. At the same time  it studied the relationship between support point and counterweight to reduce the weight of support structure. At last  it gave the optimal solution. (2012) Trans Tech Publications.   Application of carbon fibre reinforced plastic for optical camera structure (EI CONFERENCE) 会议论文 2012 9th IEEE International Conference on Mechatronics and Automation, ICMA 2012, August 5, 2012 - August 8, 2012, Chengdu, China An Y.; Yao J.-S. 收藏  |  浏览/下载：14/0  |  提交时间：2013/03/25 Optical camera is a high-precision optical instrument  and the optical lens must be always stable under various environments  so the structural materials of optical camera should have good stability and machining performance characteristics. Generally  the weight of the camera increases with the increasing size of optical camera aperture. The application of carbon fibre reinforced plastic(CFRP) in optical camera can help to improve the situation and meet the requirements of large volume and light weight. In this paper  the properties of several kind of materials used in camera structure were compared  the advantages of CFRP used in optical camera were analyzed  the CFRP application profiles of domestic and international were introduced  and the reason of gap was pointed out. There is a conclusion that CFRP will be widely used in the optical camera in China. 2012 IEEE.   A New Design of Large Aperture Telescope Drive System 会议论文 Changchun, China, 2011-6-17 Li Xiaoyan; Zhang Zhenchao; Wang Daxing 收藏  |  浏览/下载：13/0  |  提交时间：2014/01/09 drive system  permanent magnetic alternating current motor  segment motor  large aperture telescope  intelligent control method  Muti-motor synchronizing   Verification of land surface evapotranspiration estimation from remote sensing spatial contextual information SCI/SSCI论文 2012 Tang R. L.; Li Z. L.; Chen K. S.; Zhu Y. J.; Liu W. Z. 收藏  |  浏览/下载：11/0  |  提交时间：2014/12/24 surface temperature versus vegetation index triangle  MODIS  evapotranspiration  LAS  large-aperture scintillometer  energy-balance closure  southern  great-plains  vegetation index  air-temperature  triangle method  heat-flux  modis  soil  moisture   The use of large aperture scintillometer and eddy covariance system for monitoring energy and water vapour fluxes over different surfaces in the Heihe River Basin, China 会议论文 Remote Sensing and Hydrology, Wallingford Liu, Shaomin; Xu, Ziwei; Wang, Weizhen 收藏  |  浏览/下载：13/0  |  提交时间：2014/12/07 evapotranspiration  eddy covariance system  large aperture  scintillometer  SONIC ANEMOMETER  HEAT  FOREST  TEMPERATURE  EXCHANGE  AREA