机构

• 地质与地球物理研究所 [2]
• 长春光学精密机械与物... [1]
• 国家授时中心 [1]

采集方式

• OAI收割 [4]

内容类型

• 期刊论文 [3]
• 会议论文 [1]

发表日期

• 2019 [1]
• 2017 [2]
• 2008 [1]

学科主题

筛选

浏览/检索结果: 共4条，第1-4条 帮助 条数/页： 5101520253035404550556065707580859095100 排序方式： 请选择题名升序题名降序提交时间升序提交时间降序作者升序作者降序发表日期升序发表日期降序 Development of a Miniaturized Frequency Standard Comparator Based on FPGA 期刊论文  OAI收割 ELECTRONICS, 2019, 卷号: 8, 期号: 2, 页码: 15 作者:  Tang, Sheng;  Ke, Jing;  Wang, Tianxiang;  Deng, Zhouhu   |  收藏  |  浏览/下载：19/0  |  提交时间：2021/11/29 frequency standard comparator  dual Mixing Time difference  phase difference  correlation function  chebyshev polynomial   Qualitative analysis of MTEM response using instantaneous attributes 期刊论文  OAI收割 JOURNAL OF APPLIED GEOPHYSICS, 2017, 卷号: 146, 页码: 37-45 作者:  Fayemi, Olalekan;  Di, Qingyun   |  收藏  |  浏览/下载：30/0  |  提交时间：2018/09/26 Mtem  Instantaneous Attributes  Polynomial Phase Difference  Center Finite Difference  Fdtd   Qualitative analysis of MTEM response using instantaneous attributes 期刊论文  OAI收割 JOURNAL OF APPLIED GEOPHYSICS, 2017, 卷号: 146, 页码: 37-45 作者:  Fayemi, Olalekan;  Di, Qingyun   |  收藏  |  浏览/下载：29/0  |  提交时间：2018/09/26 Mtem  Instantaneous Attributes  Polynomial Phase Difference  Center Finite Difference  Fdtd   Annular sub-aperture stitching interferometry for testing of large asphreical surfaces (EI CONFERENCE) 会议论文  OAI收割 International Symposium on Photoelectronic Detection and Imaging, ISPDI 2007: Optoelectronic System Design, Manufacturing, and Testings, September 9, 2007 - September 12, 2007, Beijing, China 作者:  Zheng L.-G.;  Zhang X.-J.;  Deng W.-J.;  Wang X.-K. 收藏  |  浏览/下载：78/0  |  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