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	Testing of Annular Hyperboloid Mirror for Cassegrain System 会议论文 OAI收割 Xian, PEOPLES R CHINA, 2020-10-15 作者: Hao, Sanfeng; Zhang, Jian; An, Fei; Yang, Jianfeng \| 收藏 \| 浏览/下载：31/0 \| 提交时间：2021/07/23 Optical testing Aspherics Zernike polynomial Compensator design Optical coating
	Neural sliding-mode load frequency controller design of power systems 期刊论文 OAI收割 NEURAL COMPUTING & APPLICATIONS, 2013, 卷号: 22, 期号: 2, 页码: 279-286 作者: Qian, Dianwei; Zhao, Dongbin; Yi, Jianqiang; Liu, Xiangjie 收藏 \| 浏览/下载：25/0 \| 提交时间：2015/08/12 Load frequency control Sliding-mode control Governor dead band (GDB) Compensator design Neural networks
	Another look at linear compensator design: A classic control problem revisited 期刊论文 OAI收割 IEEE Circuits and Systems Magazine, 2011, 卷号: 11, 期号: 4, 页码: 45-50 作者: Wang, Fei-Yue 收藏 \| 浏览/下载：26/0 \| 提交时间：2015/08/12 linear compensator design
	Rotating compensator sampling for spectroscopic imaging ellipsometry 期刊论文 OAI收割 Thin Solid Films, 2011, 卷号: 519, 期号: 9, 页码: 2742-2745 作者: Meng YH(孟永宏); Jin G(靳刚) 收藏 \| 浏览/下载：14/0 \| 提交时间：2012/04/01 Rotating Compensator Spectroscopic Imaging Ellipsometry Spectroscopic Ellipsometry Imaging Ellipsometry Ellipsometry Nanofilm Pattern Microellipsometry Design Layers
	Alignment of off-axis asphere and compensator with four poles (EI CONFERENCE) 会议论文 OAI收割 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 作者: Li J.; Chen Y.; Li J.; Li J.; Wang P. 收藏 \| 浏览/下载：57/0 \| 提交时间：2013/03/25 Aspheres are utilized widely thanks to the development of optical design manufacture and testing. Compensators are usually necessary when aspheres are under test. The alignment of aspheres and their compensators is a risk because it's tough to check whether the compensators work in right way. A new method of alignment with four poles is put forward in this paper. Optical interval error can be tight while it is quite important due to direct influence on central curvature conic constant and high order coefficients of aspherical surface. A modified on-axis Foucault apparatus is set up since it makes the optical axis visible and helps to control the error of off-axis amount. Some small holes are drilled in the metallic cell of the compensator so that the ends of poles can be stably relied on in order to increase operational repeatability. The method has been carried out practically and it matches the measurement result given by a set of theodolites. 2009 SPIE.
	The analysis and design of low velocity estimation based on observer (EI CONFERENCE) 会议论文 OAI收割 2009 IEEE International Conference on Automation and Logistics, ICAL 2009, August 5, 2009 - August 7, 2009, Shenyang, China 作者: Wang D.; Zhang S. 收藏 \| 浏览/下载：33/0 \| 提交时间：2013/03/25 Low velocity servo system needs precision velocity estimation. An observer for low velocity estimation was proposed in this paper. First the source of low velocity estimation errors and the shortcomings of the single period difference were analyzed. The relationship between the estimation accuracy and estimator's frequency characteristics was concluded. Then the structure of the observer was proposed. Frequency characteristics were used to design the compensator which can stabilize the observer. The stability of the observer was also discussed. At last the observer's estimation accuracy was evaluated through a quantitative comparison. The results of simulation and experiment have shown that the quantized error in velocity estimation decreases dramatically when a velocity observer is used. Compared with some commonly-used estimators the phase lag accompanying the observer is much less. 2009 IEEE.
	Design and tolerance analysis of compensator for high order aspheric surface testing (EI CONFERENCE) 会议论文 OAI收割 2009 International Conference on Optical Instruments and Technology - Optoelectronic Measurement Technology and Systems, October 19, 2009 - October 22, 2009, Shanghai, China 作者: Chen X.; Liu W.; Chen X.; Chen X. 收藏 \| 浏览/下载：27/0 \| 提交时间：2013/03/25 High accuracy is required in surface testing of 90nm nodal point lithography projecting lens. By comparing various aspheric surface testing methods the structure layout of the compensator is a meniscus positive lens combined with a Plano-convex positive lens. The design results indicate that: primary and high order aberrations are balanced well we adopt Offner null compensator to test the aspheric surface in the point diffraction interferometer at last. In this paper MTF exceeds diffraction limit an Offner compensator is presented on the base of the third order aberration theory to test concave aspheric surface root-mean-square (RMS) of wave front error /167. The F-number of the system can achieve F/1.64. By the analysis of the process of aspheric surface testing with the designed system the optical construction parameters of which is determined by introducing equal-quantities spherical aberration to compensate all orders of aspheric coefficients. The field of view of the system is 0.02 a loosen distribution of the tolerance was presented based on the accuracy of measuring apparatus. 2009 SPIE.