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浏览/检索结果: 共4条，第1-4条 帮助 限定条件 发表日期：2008     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 The Study on Servo-Control System in the Large Aperture Telescope 会议论文 Marseille, France, 2008-6-23 Wei Hu; Zhenchao Zhang; Daxing Wang 收藏  |  浏览/下载：18/0  |  提交时间：2014/01/02 Large Aperture Telescope  Digital Signal Processor (DSP) Module  Direct Torque Control(DTC)  Permanent Magnet Synchronous Machine(PMSM)  Intelligent Power Modules (IPM)   Annular sub-aperture stitching interferometry for testing of large asphreical surfaces (EI CONFERENCE) 会议论文 International Symposium on Photoelectronic Detection and Imaging, ISPDI 2007: Optoelectronic System Design, Manufacturing, and Testings, September 9, 2007 - September 12, 2007, Beijing, China Wang X.-K.; Wang L.-H.; Zheng L.-G.; Deng W.-J.; Zhang X.-J. 收藏  |  浏览/下载：66/0  |  提交时间：2013/03/25 Annular subaperture stitching interferometric technology can test large-aperture  and the PV and RMS of residual error of the full aperture phase distribution is 0.027 and 0.0023  high numerical aperture aspheric surfaces with high resolution  the relative error of PV and RMS is -0.53% and -0.31%  respectively. The results conclude that this splicing model and algorithm are accurate and feasible. So it provides another quantitive measurement for test aspheric surfaces especially for large aperture aspheres besides null-compensation.  low cost and high efficiency without auxiliary null optics. In this paper  the basic principle and theory of the stitching method are introduced  the reasonable mathematical model and effective splicing algorithm are established based on simultaneous least-squares method and Zernike polynomial fitting. The translation errors are eliminated from each subaperture through the synthetical optimization stitching mode  it keeps the error from transmitting and accumulating. The numerical simulations have been carried on by this method. As results  the surface map of the full aperture after stitching is consistent to the input surface map  the difference of PV error and RMS error between them is -0.0074 and -0.00052 ( is 632.8nm)  respectively   Optical system design with high resolution and large field of view for the remote sensor (EI CONFERENCE) 会议论文 Chang J.; Weng Z.-C.; Wang Y.-T.; Cheng D.-W.; Jiang H.-L. 收藏  |  浏览/下载：21/0  |  提交时间：2013/03/25 In this paper  we are presenting a design method and its results for a space optical system with high resolution and wide field of view. This optical system can be used both in infrared and visible configurations. The designing of this system is based on an on-axis three-mirror anastigmatic (TMA) system. Here the on-axis concept allows wide field of view (FOV) enabling a diversity of designs available for the Multi-Object Spectrometer instruments optimized for low scattered and low emissive light. The available FOVs are upto 1 in both spectrum ranges  whereas the available aperture range is F/15 - F/10. The final optical system is a three-mirror telescope with two on-axis and one off-axis segment and its resolution is 0.3m or even lower. The distinguished feature of this design is that it maintains diffraction-limited image at wide wavelengths. The technological developments in the field of computer generated shaping of large-sized optical surface details with diffraction-limited imagery have opened new avenues towards the designing techniques. Such techniques permit us to expand these technological opportunities to fabricate the aspherical off-axis mirrors for a complex configuration.   The ELT situation in China 会议论文 Retirement Symposium for Arne Ardeberg on Extremely Large Telescopes - Which Wavelengths, Lund, SWEDEN, 2007-11-29 作者:  Liu Z(刘忠);  Cui, XQ;  Liu Z(刘忠) 收藏  |  浏览/下载：8/0  |  提交时间：2016/04/06 Extremely Large Telescope  ground based  segment  ring aperture  Interferometric Telescope  active  optics  adaptive optics  spherical mirror  site survey  Dome A