中国科学院机构知识库网格系统: 检索

Improved modulation method for optical module based on compensation technology (EI CONFERENCE) 会议论文 OAI收割
2012 International Conference on Industrial Control and Electronics Engineering, ICICEE 2012, August 23, 2012 - August 25, 2012, Xi'an, China
Cheng P.; Yu W.-J.; Wang R.-G.; Zheng X.-F.

收藏 | 浏览/下载：19/0 | 提交时间：2013/03/25

In order to increase the performance of the optical module an improved modulation method based on compensation technology is provided. Firstly the development of the optical module is illustrated. Secondly the combination and the main parameters of the optical module are listed. Thirdly in according to the existing module package the method based on compensation technology is elaborated. Finally this method is used in one of internet device and the experimental results show that this method is able to ensure the superior performance of the module. 2012 IEEE.

Method for improving transmission efficiency in 40Gbit/s system based on dispersion compensation (EI CONFERENCE) 会议论文 OAI收割
2012 International Conference on Industrial Control and Electronics Engineering, ICICEE 2012, August 23, 2012 - August 25, 2012, Xi'an, China
Yu W.-J.; Wang R.-G.; Cheng P.; Zheng X.-F.

收藏 | 浏览/下载：21/0 | 提交时间：2013/03/25

In an effort to overcome the problem that the transmission efficiency is too low in 40Gbit/s system a method based on dispersion compensation is provided. Firstly the application background of 40Gbit/s system the key using technologies and the shortcomings and advantages of 40Gbit/s system are possessed. Secondly an application program of 40Gbit/s system based on dispersion compensation is given. At the same time this program is analyzed. Thirdly this program is compared with another program which has been widely used in 40Gbit/s system. Finally the compared results show that this program is able to improve the transmission efficiency apparently. 2012 IEEE.

Optical signal noise ratio increased by multiplexing algorithm for QSFP+ module (EI CONFERENCE) 会议论文 OAI收割
2012 International Conference on Industrial Control and Electronics Engineering, ICICEE 2012, August 23, 2012 - August 25, 2012, Xi'an, China
Yu H.-C.; Zheng X.-F.; Cheng P.; Yu W.-J.

收藏 | 浏览/下载：42/0 | 提交时间：2013/03/25

In order to increase OSNR (Optical Signal Noise Ratio Secondly Thirdly OSNR) of QSFP+ module the realization steps of the multiplexing algorithm is provided this algorithm is applied in QSFP+ module and the corresponding circuit of host board is designed and the experimental result shows that multiplexing algorithm is able to increase OSNR 2 dB. 2012 IEEE. a multiplexing algorithm is proposed. Firstly the development of optical module and the characteristics of QSFP+ module are illustrated

The analyze and design of focusing system for space camera (EI CONFERENCE) 会议论文 OAI收割
2012 International Conference on Electrical Insulating Materials and Electrical Engineering, EIMEE 2012, May 25, 2012 - May 27, 2012, Shenyang, Liaoning, China
作者: Yu T.

收藏 | 浏览/下载：25/0 | 提交时间：2013/03/25

In order to control the focal plane and guarantee the imaging quality of space camera the focusing system was proposed. Firstly the reasons of defocusing were analyzed and a solution method was given. Secondly the system structure and operating principle were introduced. Thirdly the system design was presented in detail. Finally the system was experimented. Experimental results indicate that the defocusing amount of camera can be controlled below 10 um and the focusing system satisfies the requirement of system design. (2012) Trans Tech Publications Switzerland.

Simulation and experiment of the static FTIR based on micro multi-step mirrors (EI CONFERENCE) 会议论文 OAI收割
International Symposium on Photoelectronic Detection and Imaging 2011: Sensor and Micromachined Optical Device Technologies, May 24, 2011 - May 26, 2011, Beijing, China
作者: Liang Z.-Z.; Zhang J.; Zhang J.; Zhang J.; Zhu W.-B.

收藏 | 浏览/下载：30/0 | 提交时间：2013/03/25

In recent years Fourier transform spectrometer (FTS) with small size and low mass is required in many applications with growing need for real-time and small platform spectral detection. In this paper a micro Fourier transform infrared spectrometer (FTIR) based on spatial modulation mode was designed. This spectrometer has the advantages of high stability and simplified configuration. It also promises optical path differences (OPD) with high precision as MOEMS technology is used in manufacturing the key components. The simulation and the experiments with regard to this FTIR configuration have been done. Firstly the diffraction effect of the micro multi-step mirrors (MMSMs) is studied. We discuss the influence to the reversed spectrum by different mirror widths and different diffraction distances. Secondly we simulate and analyze the influence of the source solid angle to the spectral resolution. Thirdly we set up the theoretical model of the collimation error which is mainly from the defocus of the optical system and analyze the result caused by the collimation error. Fourthly a new discrete Fourier transform arithmetic using least-squares cosines progression (LSCP) is proposed which can reconstruct the spectrum with nonuniform sampled signals. Finally the MMSMs are fabricated used the MOEMS technology and the structural parameters are tested. 2011 Copyright Society of Photo-Optical Instrumentation Engineers (SPIE).

Improved algorithm of LED display image based on composed correction (EI CONFERENCE) 会议论文 OAI收割
International Conference on Advances in Computer Science, Environment, Ecoinformatics, and Education, CSEE 2011, August 21, 2011 - August 22, 2011, Wuhan, China
Song X.-J.; Ma X.-Q.; Liu W.-Y.; Zheng X.-F.

收藏 | 浏览/下载：16/0 | 提交时间：2013/03/25

In order to enhance the display result of the LED display image an improved algorithm of LED display image based on composed correction is proposed. Firstly the correction principle and the development status of the current correction technologies of the LED display image is introduced and the two main correction technologies are analyzed. Secondly the theory of composed correction is proposed by constructing a mathematical model. Thirdly this algorithm is achieved in VHDL which is one of hardware description language and verified in an experimental platform. Experimental results show that this algorithm is able to enhance the display result of the LED display image significantly. 2011 Springer-Verlag Berlin Heidelberg.

The research of corner detector of teeth image based on the curvature scale space corner algorithm (EI CONFERENCE) 会议论文 OAI收割
2010 International Conference on Computer, Mechatronics, Control and Electronic Engineering, CMCE 2010, August 24, 2010 - August 26, 2010, Changchun, China
作者: Yang L.; Wang X.; Wang X.; Wang X.; Yang L.

收藏 | 浏览/下载：18/0 | 提交时间：2013/03/25

In order to detect the corners of the teeth image secondly thirdly last this method can detects the corners of the teeth image effectively which were acquired by oral cavity endoscope we segmented the image by the threshold based on the gray value of the image we detected the edge of the teeth image by the Canny edge detector we detected the corners by the adaptive threshold curvature scale corner detector. Through lots of experiments and we compare this method to other corner detector methods which offers some available parameters for the 3D reconstruction of the teeth. 2010 IEEE. in this paper we used the CSS algorithm. In this method firstly we removed the noise of the image by the morphology open operation and median filtering

Far-field focusing of laser beam based on digital image processing techniques (EI CONFERENCE) 会议论文 OAI收割
Optoelectronic Imaging and Multimedia Technology, October 18, 2010 - October 20, 2010, Beijing, China
作者: Zhao S.; Tian Y.-Z.; Liu L.-S.; Guo J.; Zhang H.-Y.

收藏 | 浏览/下载：26/0 | 提交时间：2013/03/25

In order to lead the laser beam transmit in the atmosphere convergently an experiment of laser focus at the distance of 450m and 300m has been operated in the outdoor place. The actual manipulations are as follows: Firstly the laser was collimated by a beam expander then the near-parallel laser beam was transmitted with a Galileo telescope system and the distance between the concave lens and the convex lens can be tuned through a precise displacement platform so the focus of the system changed due to the tiny displacement of the concave lens. Secondly the average power of the laser spot can be measured using power meter the power is 47.67mW and the standard deviation is 0.67mW while the focal length is 450m. Thirdly the energy distribution was found through the laser beam analyzer. The spot images were saved using the beam analyzer then the saved image can be processed with Matlab software afterwards. The function named EDGE and Sobel operator was used in the pre-processing of the saved image then method of median filter was used in the course of image de-noising and 53H filter was adopted in the signal analysis. The diameter of laser spot was obtained by the method above the diameter is 5.56mm and the standard deviation is 0.24mm. The spot center excursion is 0.56mm it is 10.43% of the total diameter of the laser spot. At last the key factors of the energy dissipation in the focusing system can be summarized as follows: restriction of the diffraction limit attenuation in the atmosphere geometrical aberration of optical system and the diffraction limit and the geometrical aberration are significant in the three factors above so we can reduce the impact of the both factors during the design of optical system. The reliable referenced data of the system design can be acquired through the primary experiment research. 2010 SPIE.

The implementation of parachute jump commanding and simulation training system (EI CONFERENCE) 会议论文 OAI收割
2010 3rd International Conference on Advanced Computer Theory and Engineering, ICACTE 2010, August 20, 2010 - August 22, 2010, Chengdu, China
作者: Li Y.; Li Y.; Li Y.; Li Y.; Cui S.

收藏 | 浏览/下载：29/0 | 提交时间：2013/03/25

In order to improve the method of training the commander secondly thirdly Finally the aerial instructor we adopted Vega to develop the aerial instructor federate with the models we build with Creator on MFC at Visual C++6.0 platform we implement the commander federate we interlink the federate that we implemented above with RTI back parachute commander the guarantee unit federate realize a cooperated parachute jump training system. Through lots of experiments and we compare the training system experiment result with the computes data the guarantee unit and the aerial broadcaster the back parachute commander federate and the aerial broadcaster federate on MFC at VC++6.0 we use the compare result to direct the trainee. This system makes the parachute jump command training more effective in this paper more safety we used Vega shorten training cycle Creator lower costs and weather protected. 2010 IEEE. and RTI implement the Parachute Jump Commanding And Simulation System to simulate the parachute jump commanding process. In this system firstly we used Creator build the 3D models that we need in the system

Key techniques of laser direct writing patterns on spherical substrate (EI CONFERENCE) 会议论文 OAI收割
3rd International Symposium on Advanced Optical Manufacturing and Testing Technologies, AOMATT 2007: Design, Manufacturing, and Testing of Micro- and Nano-Optical Devices and Systems, July 8, 2007 - July 12, 2007, Chengdu, China
作者: Zhao J.-L.; Feng X.-G.

收藏 | 浏览/下载：23/0 | 提交时间：2013/03/25

Comparing with the writing method of plane pattern spherical pattern' has some remarkable different on several points. Firstly it is difficult to spin-coated a uniform photoresist film on a spherical substrate especially the ratio of spherical radius to caliber is smaller and the spin-coated way must match the ratio of spherical radius to caliber. Secondly if the sphere couldn't be regarded as a plane a so-called concentric optical scan movement way must be applied for the generation of spherical pattern because the reflex of substrate will affect the quantity of illumination. Commonly an alignment technique is indispensable with pattern generation of spherical surface by the concentric optical scan in order to ensure the orthogonal intersection of focusing laser beam and writing surface. Thirdly a uniform velocity control must be considered for the laser direct writing method on a spherical substrate. Otherwise the exposure time of photoresist will be different and the line widths of pattern will be also different at different areas. Fourthly commonly because the errors of concentric machine and substrate surface shape are bigger so focusing servo-control technique is also needful for writing a pattern on a spherical substrate. Focusing servo-control may keep the focal spot on the spherical surface by a focus detection and control system in the course of writing pattern. Using these techniques we fabricated a line width of 7m and a period of 600m isometric mesh on the concave of a spherical substrate.