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浏览/检索结果: 共9条，第1-9条 帮助 限定条件 专题：长春光学精密机械与物理研究所    第一署名单位    第一作者单位    通讯作者单位     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 optical design of cubic phase plate testing system (EI CONFERENCE) 会议论文 2011 Symposium on Photonics and Optoelectronics, SOPO 2011, May 16, 2011 - May 18, 2011, Wuhan, China Xu Y.; Lin H.; Zhu W.; Zhang Y.; Zhang X. 收藏  |  浏览/下载：18/0  |  提交时间：2013/03/25 Computer-generated holograms (CGH) have been widely used for years in optical testing of aspheric surfaces in combination with Fizeau interferometers. With the development of diffraction optics  computer technology  and micro-processing technology  the accuracy of the CGH testing can achieve a hundredth of a wave  and the cost is reduced greatly. CGH is capable of producing an optical wavefront with any desired shape. So it is fascinating and will have good prospects to test free-form surfaces using CGH. As the CGH can create any wavefront shape  it can also be used in unsymmetrical aspherical surfaces testing. Taking the cubic surface as an example  this paper gives a method to test unsymmetrical surfaces. This paper gives the design to test a cubic surface. And the separation of the diffraction orders and the binary process of the continuous CGH phase function are discussed in detail. The alignment tolerance of the test system and the CGH fabrication tolerance are analyzed. We also present an idea using a CGH and two spherical lenses as null lens to test the cubic surface when the surface deviation is great. 2011 IEEE.   Application of improved UKF algorithm in initial alignment of SINS (EI CONFERENCE) 会议论文 2011 2nd International Conference on Artificial Intelligence, Management Science and Electronic Commerce, AIMSEC 2011, August 8, 2011 - August 10, 2011, Zhengzhou, China Su W. X. 收藏  |  浏览/下载：13/0  |  提交时间：2013/03/25 In order to improve the initial alignment accuracy and convergence rate of the SINS system  proposed the improved UKF algorithm (AUKF) based on the Unscented Kalman Filter (UKF). Noise statistical characteristics are mostly unknown in real systems  when it was effected by the initial value errors and dynamic model errors  AUKF algorithm can real-time adjust the covariance of the state vector and observation vector  and balance the right ratio of the state information and observation information in the filter results  thereby improving the system performance. The experimental results show: The Improved UKF Algorithm enhances the convergence speed and alignment accuracy effectively. 2011 IEEE.   Application of adaptive Kalman filter technique in initial alignment of strapdown inertial navigation system (EI CONFERENCE) 会议论文 29th Chinese Control Conference, CCC'10, July 29, 2010 - July 31, 2010, Beijing, China Huang C.; Su W.; Liu P.; Ma M. 收藏  |  浏览/下载：20/0  |  提交时间：2013/03/25 In order to improve the alignment precision and convergence speed of strap-down inertial navigation system  but in the active system most noise statistical characteristics are unknown  an initial alignment method based on Sage-Husa adaptive filter is presented. We also derived the exactitude alignment error model and adaptive Kalman filter equation in the azimuth of small misalignment angle. As usual  in this case  known the noise statistical characteristics  we introduce the adaptive Kalman filter. It uses the information of observed data  Kalman filter is suitable  on-line estimation noise statistical characteristics and state simultaneously in order to improve the filter continuously  so  the filter has a higher estimation accuracy than the conventional Kalman filter. By simulating verifying  the adaptive Kalman filter enhances the convergence speed and alignment accuracy effectively.   The registration of aerial infrared and visible images (EI CONFERENCE) 会议论文 2010 International Conference on Educational and Information Technology, ICEIT 2010, September 17, 2010 - September 19, 2010, Chongqing, China Sun M.; Bao Z.; Liu J.; Wang Y.; Quan Y. 收藏  |  浏览/下载：14/0  |  提交时间：2013/03/25 In order to solve the registration problem of different source image existed on aerial image fusion  algorithms based on Particle Swarm Optimization (PSO) are applied as search strategy in this paper  and Alignment Metric (AM) is used as judgment. This study has realized the different source image registration of infrared and visible light with high speed  high accuracy and high reliability. Basically  with little restriction of gray level properties  a new alignment measure is applied  which can efficiently measure the image registration extent and tolerate noise well. Even more  the intelligent optimization algorithm - Particle Swarm Optimization (PSO) is combined to improve the registration precision and rate of infrared and visible light. Experimental results indicate that  the study attains the registration accuracy of pixel level  and every registration time is cut down over 40 percent compared to traditional method. The match algorithm based on AM  solves the registration problem that greater differences between different source images are existed on gray and characteristic. At the same time  the adoption of combining the intelligent optimization algorithms significantly improves the searching efficiency and convergence speed of the algorithms  and the registration result has higher accuracy and stability  which builds up solid foundation for different source image fusion. The method in this paper has a magnificent effect  and is easy for application and very suitable for engineering use. 2010 IEEE.   Application of adaptive UKF in initial alignment of MINS/GPS integrated navigation system (EI CONFERENCE) 会议论文 2010 3rd International Conference on Advanced Computer Theory and Engineering, ICACTE 2010, August 20, 2010 - August 22, 2010, Chengdu, China Jiao W.-B.; Gao Q.; Su W.-X.; Wang M. 收藏  |  浏览/下载：23/0  |  提交时间：2013/03/25 In order to overcome the shortcomings of standard unscented Kalman filter (UKF)  which are obviously influenced by the error of initial value and the model error of system  adaptive UKF which is based on the adaptive principle is applied in initial alignment of the MINS/GPS integrated navigation system. Coarse alignment cannot be done by micro inertial measurement unit (MIMU) itself because of its low precision  the method of using magnetometer to assist it with coarse alignment is presented. Simulation results show that the adaptive UKF can overcome the influences of initial values error and inaccurate system model  and improve the convergence speed and alignment accuracy effectively. 2010 IEEE.   Research on 10.6 m laser beam monitoring in CO2 laser processing system (EI CONFERENCE) 会议论文 Infrared Materials, Devices, and Applications, November 12, 2007 - November 15, 2007, Beijing, China Shi Y.; Gao Y.; Deng W.; Shao S. 收藏  |  浏览/下载：19/0  |  提交时间：2013/03/25 It is a key point of CO2 laser beam monitoring in the CO 2 laser processing system to achieve alignment between CO2 laser and PL (pointing and launching) system. By monitoring the angle offset of CO2 laser beam  the compensation can be gotten witch is given to fast-steering mirror to rectify the direction of laser beam. But the normal photoelectric detector can not get the laser signal because of CO2 laser's high energy and long wavelength. Its wavelength is 10.6m and its power can reach kW level. Consequently  it is difficult to detect the high-energy 10.6m laser beam directly. So  we monitored the output mirror of laser resonator superseded the laser beam  indirectly. The laser beam monitoring system could be designed based on CCD laser auto-collimation angular measurement principle and image processing method. In this paper  application of CCD laser auto-collimation angular measurement principle and image processing method for CO2 laser beam monitoring system is introduced particularly  After design  fabrication and alignment  the monitoring system can be used for experimental study that including angular measurement accuracy and angle offset measurement of CO2 laser beam. Angle offset range and angle variation rule of CO2 laser beam is also can be acquired for further research.   Computer aided alignment for off-axis asphere null test (EI CONFERENCE) 会议论文 Optical Design and Testing II, November 8, 2004 - November 11, 2004, Beijing, United states Zheng L.; Xue D.; Zhang X. 收藏  |  浏览/下载：11/0  |  提交时间：2013/03/25 The method of null test is widely used for testing an aspheric mirror. During optical manufacturing process  the mirror has to be moved up and down for testing and fabricating. Because the alignment of null test is difficult and time costing  the efficiency of making aspheric mirror is decreased greatly. In order to solve the problem  we developed a software based on polynomial fitting to calculate the misalignment parameters. By using the software and computer numeric controlled adjusting equipments  the efficiency of testing is increased and the accuracy of test has reached up to /40 RMS where equals to 632.8nm  which has fulfilled the demand of the designer.   Analysis of alignment error in asphere testing using a corrector (EI CONFERENCE) 会议论文 Optical Design and Testing II, November 8, 2004 - November 11, 2004, Beijing, United states Xue D.-L.; Zheng L.-G.; Zhang X.-J. 收藏  |  浏览/下载：9/0  |  提交时间：2013/03/25 The characteristics and effects of alignment error on test results are analysed in this paper. The mathematical model are established  the least square method is used to determine the misalignment. Procedures are presented that allow for separation of misalignment from misfigure in asphere testing. The misalignment-induced aberrations by corrector and the support of the mirror can be calculated and subtracted from segment interferogram so that only true misfigure remains. The accuracy of the system can reach up to 0.028(=632.8nm).   Study on optical parts of MOEMS optical switch with low insertion loss (EI CONFERENCE) 会议论文 MEMS/MOEMS Technologies and Applications II, November 10, 2004 - November 12, 2004, Beijing, China Ming A.; Liang J.; Lan W.; Dong W.; Yao J.; Wang W.; Le Z.; Chen W.; Wang L. 收藏  |  浏览/下载：22/0  |  提交时间：2013/03/25 We study insertion losses of optical switch when the laser beam is propagating during the free space between two single mode fibers (SMFs) and the related assemblage challenges  Then a new packaging structure is developed for the hybrid-integration of free-space MOEMS (micro-opto-electro-mechanical systems) chip with a silicon micromachined submount to improve alignment accuracy. The submount is designed to accommodate various free-space MOEMS chips with minimal active optical alignment  thus reducing the packaging cost. The silicon submount has a central recess to place the MOEMS chip in  sixteen V-grooves for optical fibers  and micropits for micro ball lenses  all bulk micromachined at the same time by a single anisotropic wet etching step. A corner compensation technique is employed to prevent erosion of the convex corners  where different geometries meet. Through this assembling method  the fiber  micro ball lens can be aligned preciously thus reduced lateral and angular misalignment between them. Then total insertion losses can be decreased.