QQ客服 官方微博 反馈留言

浏览/检索结果: 共10条，第1-10条 帮助 限定条件 发表日期：2010    内容类型：会议论文    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 Design and analysis of Roll-Swing imaging seeker scan scheme (EI CONFERENCE) 会议论文 2010 2nd International Conference on Industrial Mechatronics and Automation, ICIMA 2010, May 30, 2010 - May 31, 2010, Wuhan, China Bai Y.; Liu B.; Jia H.; Guo L. 收藏  |  浏览/下载：15/0  |  提交时间：2013/03/25 To achieve an optimum scan area and target stay time for Roll-Swing imaging seeker  the scanning process is analyzed. The method of ground imaging area calculation is proposed in this paper. A kind of Roll-Swing imaging frame mechanism is introduced. The flight process simulation base on real flight data is realized. According to imaging sensor parameters and flight data  a new scan scheme method is proposed and a new scan scheme is designed. The new scan scheme is compared to traditional scan scheme from different guide lines. The test results indicate that the new scan scheme satisfy requirement of the real flight experiment. 2010 IEEE.   Study on medical X-ray coherent scatter imaging and processing based digital flat detector (EI CONFERENCE) 会议论文 3rd International Conference on BioMedical Engineering and Informatics, BMEI 2010, October 16, 2010 - October 18, 2010, Yantai, China Liu J.; Lv Y.; Li B.; Liu T.; Hu B.; Zhao J. 收藏  |  浏览/下载：21/0  |  提交时间：2013/03/25 It is introduced a novel imaging technique for medical diagnostic X-ray coherent scatter in this paper. A set of experimental equipment for X-ray coherent scatter imaging was set up with X-ray digital flat detector and medical diagnostic X-ray source. According to this equipment  the scatter images obtained are made of some circles with the same center. It is vital to calculate the energy template to classify the different samples. It is difficult to separate them using the traditional threshold method due to noise and overlapped shadow. In this paper  the image was transformed a binary image by using K-Means algorithm and Mathematical Morphology Methods. The effective region was extracted from the binary image inside the orthogonal energy projection space  then to calculate the centroid of rings. Consequently the curve of the energy distribution was built. The experiment results show that our method is reasonable and feasible. The technique will have wide foreground of application .Besides the imaging of human bone content  it can be used for various imaging of tissue and organs in biology. 2010 IEEE.   ZnO films growth at different temperature on the substrate of Corning glass by MOCVD (EI CONFERENCE) 会议论文 2009 International Symposium on Liquid Crystal Science and Technology, August 2, 2009 - August 5, 2009, Kunming, China Tang W.; Yang X.; Wang C.; Zhao C.; Gao X.; Yang J.; Liu B.; Liang H.; Zhao J.; Sun J.; Du G. 收藏  |  浏览/下载：17/0  |  提交时间：2013/03/25 We deposited ZnO films on Corning glass substrate by metal-organic chemical vapor deposition (MOCVD). We found the diffraction (002) peak at ~34.46  indicating that the ZnO thin films were C-oriented. ZnO films were highly transparent with a transmission ratio larger than 85% in the visible range. The surface morphology of the films was observed by atomic force microscopy (AFM). (2010) Trans Tech Publications.   Growth of ZnO films under different oxygen partial pressures by metal organic chemical vapour deposition (EI CONFERENCE) 会议论文 2009 International Symposium on Liquid Crystal Science and Technology, August 2, 2009 - August 5, 2009, Kunming, China Wang C.; Yang X.; Liu B.; Zhao C.; Tang W.; Yang J.; Gao X.; Liang H.; Zhao J.; Sun J.; Du G. 收藏  |  浏览/下载：19/0  |  提交时间：2013/03/25 ZnO films were grown under different oxygen partial pressures by metal organic chemical vapor deposition on the substrates of Corning glass. We investigated the quality of the films by SIEMENS D8 X-ray diffractometer. The surface morphology of the films were observed by Digital Nanoscope IIIa AFM with normal silicon nitride tip in the contact mode. The hall effect measurements were carried out with indium ohmic contact. The transmission spectrum of the films were measured. The transmission ratio is larger than 80% in the region above the wavelength of 385nm  and sharply decreased under 10% below the wavelength of 375 nm. (2010) Trans Tech Publications.   Fabrication of ZnO thin film transistors based on the substrate of glass (EI CONFERENCE) 会议论文 2009 International Symposium on Liquid Crystal Science and Technology, August 2, 2009 - August 5, 2009, Kunming, China Yang X.; Wang C.; Zhao C.; Tang W.; Gao X.; Yang J.; Liu B.; Qi X.; Du G.; Cao J. 收藏  |  浏览/下载：23/0  |  提交时间：2013/03/25 Abstract. In our paper  we induced the process of ZnO based thin film transistors (ZnO-TFTs) fabricated on the substrate of glass. The photolithographic plate designed for using in the ZnO-TFT devices fabrication process was shown in our paper. The ZnO-TFT devices were fabricated successfully  the Ion/off ratio is 104. (2010) Trans Tech Publications.   The research on the automatic measurement of frequency characteristics of opto-electronic platform (EI CONFERENCE) 会议论文 2010 International Conference on Computer, Mechatronics, Control and Electronic Engineering, CMCE 2010, August 24, 2010 - August 26, 2010, Changchun, China Liu H.; Gao S.; Liu B.; Chen J.; Jia H.; Liang W. 收藏  |  浏览/下载：15/0  |  提交时间：2013/03/25 A new frequency characteristic test method is proposed based on the digitization characteristics of optoelectronic platform servo system. First a digital processing controller is used to automatically test the entire process and tested data are uploaded to a PC through CAN-bus  and then the tested data are transferred into accurate transfer function with the Levy method. Here we discuss the testing steps  the data processing  the extraction  the Bode diagram plotting and the model identification in detail. The corresponding experiments are carried out  and the results show that the method is simple with the features of high efficiency  high precision and engineering feasibility. 2010 IEEE.   Thermal difference analysis and athermalization design of infrared optical system (EI CONFERENCE) 会议论文 Optical Design and Testing IV, October 18, 2010 - October 20, 2010, Beijing, China Ai X.-Q.; Liu B.; Zhang X.; Jia H. 收藏  |  浏览/下载：25/0  |  提交时间：2013/03/25 When infrared optical system works in a large temperature range  the thermal effect of optical lens and optical tube will produce image plane shift and lead to imaging quality deterioration. In order to eliminate the thermal aberration  the athermalization design principles of infrared optical system were introduced  and some commonly used methods of thermal difference compensation were described. Proceeding from single lens  the thermal difference caused by temperature changing was analyzed  and the relationship between temperature and focus shift was obtained. Considering optical tube thermal expansion  a set of equations to estimate the thermal difference of lens group was given. Finally  an infrared optical imaging system that can work under the temperature range of -40C to 60C was design according to athermal technique  in which a new mechanical passive temperature compensation was proposed. Through simulation  the athermalization design could make imaging plane shift the smallest. The simulation results coincided with the theoretical formula  and the design had reference value in engineering. 2010 Copyright SPIE - The International Society for Optical Engineering.   Design and analysis of power system of micro-electromechanical actuator (EI CONFERENCE) 会议论文 2010 2nd International Conference on Industrial Mechatronics and Automation, ICIMA 2010, May 30, 2010 - May 31, 2010, Wuhan, China Han X.; Liu B.; Zhang J.; Jia H.; Ge W. 收藏  |  浏览/下载：15/0  |  提交时间：2013/03/25 In order to apply the electromechanical actuator to tactical mini-missiles  maximum rotational speed of output shafts is greater than 250/s. Test results basically correspond to the requirement of technical indexes. It is proved that this analysis and design method is congruent with the design of micro-electromechanical actuators  this paper researches on the key technology such as load-bearing ability  the system bandwidth can reach 25.3Hz on the condition of no load and 23.4Hz on the condition of load  thus the method is feasible. 2010 IEEE.  rapidity and miniaturization of the micro-electromechanical actuator power system based on the ball screw. First  according to specific technical indexes  the power  electromechanical time constant and the size of the motors are screened originally through theoretical analysis. Finally  based on the characteristics of ball screw transmission  load locus of the micro-electromechanical actuator dynamic system is theoretically analyzed and the optimum speed ratio is determined through parameter optimization. The results of the double closed loop controlled test on the principle prototype show: the system can operate normally with 2.5N.m hinge moment   Model identification and closed-loop confirmation for opto-electronic platform of seeker (EI CONFERENCE) 会议论文 2010 2nd International Conference on Industrial Mechatronics and Automation, ICIMA 2010, May 30, 2010 - May 31, 2010, Wuhan, China Liu H.; Liu B.; Chen J.; Jia H.; Zhang J.; Wang M. 收藏  |  浏览/下载：27/0  |  提交时间：2013/03/25 A mathematical model of seeker opto-electronic platform is the basis for researching performance  designing a servo control system and simulating. Focusing on high frequencies of mechanical resonant  restriction of gimbaled axis rotation  a new model identification method was proposed under the pseudo-random invert-M-sequences. The testing signal  data acquisition  the calculating of frequency response  and least square identification were investigated. The realized steps are explicitly illustrated  and the testing example is given in this paper  the results confirm that the proposed method is effective and practical. 2010 IEEE.   Research of improving the accuracy of license plate character segmentation (EI CONFERENCE) 会议论文 5th International Conference on Frontier of Computer Science and Technology, FCST 2010, August 18, 2010 - August 22, 2010, Changchun, China Qiao S.; Zhu Y.; Li X.; Liu T.; Zhang B. 收藏  |  浏览/下载：24/0  |  提交时间：2013/03/25 In order to improve the accuracy of license plate character segmentation  use line-shape filter to remove plate frames. Then character segmentation approach combines projection and inherent characteristics of character  this paper strengthens preprocessings before segmentation. In character binarization  can better solve character adhesion and fracture problem. For tilted characters only in horizontal direction  use improved Bemsen method to reduce noise interference  even without tilt correction  this method can achieve better segmentation. Experiment results shows the accuarcy of character segmentation reaches 97%. 2010 IEEE.