中国开放科研知识云: 检索

The surface passivation on the optical and surface properties of InP 会议论文
12th China International Nanoscience and Technology Symposium, and the Nano-Products Exposition, CINSTS 2013, October 27, 2013 - October 31, 2013, Chengdu, China
Gao X.; Wei Z. P.; Fang D.; Zhao H. F.; Fang X.; Tian S. S.; Tang J. L.; Du P.; Chu X. Y.; Li J. H.; Fang F.; Wang X. H.

收藏 | 浏览/下载：20/0 | 提交时间：2015/04/27

The growth and optical properties of al-doped ZnO nanofibers using pvp nanofibers as templates by atom layer deposition 会议论文
12th China International Nanoscience and Technology Symposium, and the Nano-Products Exposition, CINSTS 2013, October 27, 2013 - October 31, 2013, Chengdu, China
Fang D.; Fang X.; Zhao H. F.; Li S.; Wei Z. P.; Wang X. H.

收藏 | 浏览/下载：24/0 | 提交时间：2015/04/27

Research on thermistor simulation based on digital potentiometer for microsatellites 会议论文
4th International Conference on Instrumentation and Measurement, Computer, Communication and Control, IMCCC 2014, September 18, 2014 - September 20, 2014, Harbin, Heilongjiang, China
Guangquan Z.; Jiwei Z.; Sirui X.; Wei X.

收藏 | 浏览/下载：10/0 | 提交时间：2015/04/27

Design of heliostats field for the scale of 1MW solar power tower plant (EI CONFERENCE) 会议论文
2012 Asia-Pacific Power and Energy Engineering Conference, APPEEC 2012, March 27, 2012 - March 29, 2012, Shanghai, China
Zhang H.; Wang Z.; Wei X.; Lu Z.

收藏 | 浏览/下载：24/0 | 提交时间：2013/03/25

The development in basic technology and market strategy of solar thermal power techniques is booming rapidly due to the limited fossil resources and severe environmental problems all over the world. In this paper the design method of heliostats field for the scale of 1MW solar power tower plant with latitude of 40.4N at the design point of the noon of spring equinox is introduced which uses the multiplication of three efficiencies of cosine atmospheric transmittance and intercept as the preliminary boundary limit to locate heliostats while the spacing between heliostats is set not only for less shading and blocking but also for the availability of installation and maintenance of heliostats. Furthermore its optical performance tested by the software HFLD is quite good which has annual average efficiency of 71.36% and design point efficiency of 80%. 2012 IEEE.

A ROBUST STEREO MATCHING METHOD USING BELIEF PROPAGATION BASED ON IMAGE SEGMENTATION 会议论文
2011
Zhang L. G.; Wei Z. H.; He X.; Asme

收藏 | 浏览/下载：11/0 | 提交时间：2013/03/28

A small thickness measurement system based on PSD and FPGA (EI CONFERENCE) 会议论文
3rd International Conference on Measuring Technology and Mechatronics Automation, ICMTMA 2011, January 6, 2011 - January 7, 2011, Shanghai, China
Guo J.; He X.; Wei Z.; Wu Y.

收藏 | 浏览/下载：19/0 | 提交时间：2013/03/25

Considering that the requirement of industrial manufacture An AT89S51 singlechip works as the core processor of the system. By two laser triangulation a small thickness measurement system based on PSD and FPGA is presented. It takes S3931 PSD of one dimension as position detection device A FPGA produces logic control signals for the whole system the small displacement is converted to differential voltages which is made by Hamamatsu in Japan and after amplification and A/D transformation 8-bit parallel data is send to singlechip from FPGA by external interrupts and the final calculation results output to the LCD display module. After digital micro meter calibration we get the small thickness. Experiments show that the detection accuracy of the system is not less than 10um.

Effect of gimbal point displacement on optical axis pointing precision in an image seeker (EI CONFERENCE) 会议论文
2011 International Conference on Electric Information and Control Engineering, ICEICE 2011, April 15, 2011 - April 17, 2011, Wuhan, China
Zhang X.; Jiang Z.; Wei Q.; Jia H.

收藏 | 浏览/下载：30/0 | 提交时间：2013/03/25

A concentric glass spherical dome was usually chosen as the transparent window mounted in front of the optical lens in an image seeker. However optical ray had to change its direction when propagating through the dome due to refraction unless passing through the center of the dome which demanded gimbal point coincide with the center of the dome exactly. In fact gimbal point displacement could not be eliminating due to fabrication assembly and vibration therefore the optical axis pointing error generated. In this paper the effect of gimbal point displacement on optical axis pointing precision in an image seeker was analyzed and the theoretical expression of the optical axis pointing error was derived based on geometric optics and the error dynamics was explored by numerical. Take a visible light image seeker as a case the thickness of concentric glass spherical dome was 8mm and the inner radius was 72mm and the optical axis pointing errors varying dynamically with the look angle and the gimbal point displacement were shown in graph. When the gimbal displacement was 0.11mm the maximum optical axis pointing error was 0.054mrad that is equal to the instantaneous field of view (IFOV) corresponding to the camera system whose focal length was 120mm and pixel size was 6.5m. Furthermore with the gimbal displacement increasing the optical axis pointing error increased linearly. The analyzed results provided a theoretical basis for the displacement range which had to be limited strictly in the gimbal design process. 2011 IEEE.

Thermal-structure analysis of supersonic dome based on three materials (EI CONFERENCE) 会议论文
2011 International Conference on Electric Information and Control Engineering, ICEICE 2011, April 15, 2011 - April 17, 2011, Wuhan, China
Jiang Z.; Ai X.; Wei Q.; Liu B.; Jia H.

收藏 | 浏览/下载：19/0 | 提交时间：2013/03/25

To a supersonic missile a seeker could enhance the aerodynamic ability due to decrease the resistance in flying. At the same time the primary function of a seeker has been considered as the most important equipment for a missile due to the importance for cueing of targets and tracking for the final approach. However the dome of a seeker which is made up of glass has poor mechanical performance. Especially in the higher altitude for a dome in which the aerothermal and pressure loads could destroy the structure easily it is necessary to do the thermal-structure coupled analysis due to varied materials. In the paper to take the spherical dome of a seeker as a example the analysis has been completed according to the varied materials consist of MgF2 Al2O3 and ZnS. The temperature loads and the pressure loads derived from the results of fluent analysis has been forced on the surface of dome which simulates the actual Mach 2.5 in flying. According to the results of coupled analysis the SEQV stress of the dome radium 80mm based on three materials had reached to 31MPa which shows that the strength is sufficient for Mach 2.5 and offered the warranty to design the attaching to missile for the dome. At the same time the results required the flexible mounting for the dome due to the displacements results which the crystal material couldn't accept. 2011 IEEE.

Gimbal displacement error analysis on an electro-optical seeker (EI CONFERENCE) 会议论文
Optical Design and Testing IV, October 18, 2010 - October 20, 2010, Beijing, China
Jiang Z.; Zhang X.; Ai X.; Wei Q.; Jia H.

收藏 | 浏览/下载：23/0 | 提交时间：2013/03/25

It is essential to analyze the gimbal displacement errors for a seeker due to the importance for cueing of targets and tracking for the final approach. Otherwise for a seeker electro-driven with a concentric glass dome the large errors will decrease the picking pointing and tracking precision rooted from the displacement errors existing between the rotation center of the optical system and the gimbal. And the gimbaled camera system displacement errors are never eliminated but reduced due to the geometric errors consists of geometric tolerances of gimbal structure manufacture installation and vibration coming from working environment. In this paper the gimbal displacement errors in an electro-optically stabilized platform resulting from geometric errors and environment errors were analyzed and shown in detail. The mathematical modal of the gimbal displacement errors created based on multi-body dynamics demonstrated the connection between the gimbal displacement errors and the stabilized platform. Taking a visible light image seeker as a case the diameter is 120mm and the geometric tolerances came from the values of primary design and the vibration data came from the environmental vibration test on the pitch-yaw seeker and at the same time the errors resulting from installation were considered too. Based on calculating the maximum gimbal displacement error will reach to 0.2mm for pitching angle smaller than 40 and yawing angle smaller than 60. However the critical parts have been found out according to the probability theory and the reliability analysis successfully used in the paper and finally the maximum gimbal displacement error reduced to 0.1mm which is acceptable corresponding to the picking pointing and tracking precision for an optical imaging seeker. 2010 Copyright SPIE - The International Society for Optical Engineering.

The design of high speed image acquisition system over Gigabit Ethernet (EI CONFERENCE) 会议论文
2010 IEEE International Conference on Wireless Communications, Networking and Information Security, WCNIS 2010, June 25, 2010 - June 27, 2010, Beijing, China
Zhang W.; Wei Z.; He X.; Qiao P.; Liang G.

收藏 | 浏览/下载：24/0 | 提交时间：2013/03/25

The applications based on traditional digital cameras have been limited by distance cost and networking. Gigabit Ethernet is a data transmission standard based on the IEEE 802.3 protocol brings several benefits to image transmission. In this paper we compare the main features of Gigabit Ethernet and traditional digital camera interfaces. And we design a high speed image acquisition system which overcomes these application limitations by allowing cameras to send imaging data over Gigabit Ethernet. In this system we design a highly efficient bidirectional conversion device based on FPGA converts imaging data from a camera to IP packets based on UDP protocol and sends it to PCs over inexpensive Cat-5 copper LAN cable. At the PC the Cat-5 cable plugs into a standard Gigabit Ethernet NIC(network interface card) eliminating the need for a frame grabber. An communications application software is used to acquire the network data construct and display the image. A simple and efficient acknowledge and resend mechanism was used to guarantee packet delivery. The system architecture and the communication protocol are discussed in details the experiment and results are presented in this paper. 2010 IEEE.

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