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Time Transfer Based on Digital Micro-wave System

Time Transfer Based on Digital Micro-wave System

引用

第三届国际自动化测试与仪器仪表学术会议

作者： Dong Shaowu (National Time Service Center,Chinese Academy of Sciences,Xi'an 710600,China)

The micro-wave time transfer system between Lintong and Pucheng has been used to synchronize the standard time signal from the time reference station(located in Lintong, Xi'an city) and the signal from the time transmission station,which is located in Pucheng county about 70km northeast of Lintong..The digital system is the upgrade of the analogue system which has run continuously for over 30 years till 2008,for its reliability and specifications of the analogue system have been seriously degraded mainly due to the outage of the *** technical scheme for the digital micro-wave time transfer system and the realized function of it are introduced *** preliminary results show that the performance of the micro-wave time transfer system has been greatly improved,it realized a similar comparison precision as GPS Common-view(GPS CV) time comparison technique.

关键词： timekeeping micro wave time dissemination comparison precision

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Numerical Simulation of Metal Platform Influence on Spark Discharge Electromagnetic Radiation Field

Numerical Simulation of Metal Platform Influence on Spark Di...

引用

第三届国际自动化测试与仪器仪表学术会议

作者： Qian Xinming,Sun Wenlei,Huang Ping (State Key Lab.of Explosion Science and Technology,Beijing Institute of Technology,Beijing 100081,China)

A spark discharge experiment was designed to test the breakdown voltage and calculate corresponding discharge energy,which also provided basis on researching electromagnetic radiation features of spark discharge and metal platform influence on *** to the simulation software --FEKO,physical models with and without metal platform were founded and different radiation patterns were simulated under a range of *** radiation pattern of model without metal platform is similar with dipole model,comparing with that,the pattern of model with metal platform is mainly on the upper side of metal platform when frequency is getting *** band around 700 MHz was considered to be hazardous,and easy to induce radio frequency current and secondary spark discharge in other radio receivers,while metal platform can enhance this effect.

关键词： electromagnetic interference radiation field spark discharge pattern

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Promotion Role of Full-Solid Laser Technology in the Development of Scientific Instruments

Promotion Role of Full-Solid Laser Technology in the Develop...

引用

第三届国际自动化测试与仪器仪表学术会议

作者： Liu Qiushuang~1 XuXiaoli~(1,2) Chen Yongfeng~3 (1 Beijing Institute of Technology,Beijing 100081 China) 2 Key Laboratory of Modern Measurement & Control Technology(Ministry of Education),Beijing Information Science & Technology University,Beijing 100192 China 3 China TransInfo Technology Corp,Beijing 100191 China)

This paper introduces the concept of full-solid state laser,studies the research progress and development tendency of full-solid state laser,and elaborates the promotion role of full-solid state laser in the developme... 详细信息

关键词： optoelectronic technique laser full-solid laser instruments and meters micro machining.

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An Application of Morphological Edge Detection for Noisy Image

An Application of Morphological Edge Detection for Noisy Ima...

引用

第三届国际自动化测试与仪器仪表学术会议

作者： Zhang Hongqun Sun Xiaofei (College of Electronic & Information Engineering,Nanjing University of Information Science & Technology, Nanjing,210044 China)

Image edge detection is the key technology of image *** extraction is always the most classically studied projects in the computer vision and image procession *** methods of edge detection are very sensitive to the image *** the operators of edge detection can not effectively remove image *** this paper, the applied research of the morphology is introduced in the noisy *** the operators of edge detection based on the classical morphological can remove the noise *** the lines detected are fuzzy,and they can not fully reflect more edge details and can't reduce the noise impact to the largest *** morphological algorithm improved based on the multi-structuring and multi-scale elements can remove the noise and improve the positioning precision of the image edge. Finally,through simulation results,analyze its properties and give the comparison to the operators of conventional edge detection and analyze its advantages and disadvantages.

关键词： edge detection mathematical morphology noisy image structural elements

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Application of Astigmatism Method in Parallel Confocal Microscope

Application of Astigmatism Method in Parallel Confocal Micro...

引用

第三届国际自动化测试与仪器仪表学术会议

作者： Yu Qing Yu Xiaofen (School of Instrument Science and Opto-electronics Engineering,Hefei University of Technology,Hefei 230009, China)

The method of searching for extreme points is widely used in parallel confocal microscope,but the measurement precision is not high *** this paper,a cylindrical lens is added in the parallel confocal microscope system to create an astigmatism point in order to improve the axial *** this optical device fixed into the imaging optical path,an elliptical facula is formed beside the in-focus image,and with the help of four-quadrant method,a new light intensity and displacement curve is *** standard gauge block's thickness is set as the measured object in experiment to compare with the traditional and astigmatism *** result indicates that not only some errors of system can be eliminated,but also the axial resolution can be improved about 5 times than the traditional method.

关键词： Parallel confocal microscope cylindrical lens elliptical facula astigmatism method light intensity and displacement curve

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Vibration Control of Cantilever Beam Based on Piezoelectric Self-sensing Actuator

Vibration Control of Cantilever Beam Based on Piezoelectric ...

引用

第三届国际自动化测试与仪器仪表学术会议

作者： Cao Qingsong Sun Faxiong Xiong Guoliang (Key Laboratory of Ministry of Education for Conveyance and Equipment, East China Jiaotong University,Nanchang 330013,China)

Piezoelectric self-sensing actuator is functional integration of the piezoelectric sensor and *** this paper,the mathematical model of the piezoelectric self-sensing actuator is established,the bridge circuit signal separation method is used to separate the sensing signal and control signal, and the amplifier,low-pass filter and the controller are designed to compose the cantilever beam vibration control *** two groups of experiments are carried out,the results show that the cantilever beam vibration control system runs normally and the piezoelectric self-sensing actuator can restrain vibration of the beam effectively.

关键词： self-sensing piezoelectric actuator cantilever beam vibration control

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Design of Robot Performance Testing Platform

Design of Robot Performance Testing Platform

引用

第三届国际自动化测试与仪器仪表学术会议

作者： Chai Yu Li Yanchun (School of Electrical and Control Engineering, Xi'an University of Science and Technology,Xi'an,710054,China)

In order to evaluate the robot performance more objectively,and provide basis for the robot performance evaluation criteria,the robot performance testing platform is *** mechanical structure is formed with four pressure sensors and a rigid *** single-chip microcomputer control system is formed with the MSP430F149 single-chip and some expansion peripheral *** the PC management software is developmented with Visual Basic6.0 and Access 2003 *** platform can complete the data acquisition and management of the robot move status,and the algorithm which can transform the robot running data into the robot performance data is *** performance information can be display,analysis,processing and storage by the PC management *** RS-232 cable and Zigbee wireless conmmunication interface circuits are designed,and they can be choosed for the communication between the upper and lower *** results of system test verify the feasibility and accuracy of the design.

关键词： robot performance pressure sensor MSP430F149 Visual Basic6.0

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Method of Reconstructing Polarization Distribution of Incident Light Beam

Method of Reconstructing Polarization Distribution of Incide...

引用

第三届国际自动化测试与仪器仪表学术会议

作者： Niu Chunhui,Wang Xiaoling,Lv Naiguang,Zhou Zhehai,Li Xiaoying (Photoelectric School,Beijing Information Science &Technology University,Beijing 100192 China)

A novel method for reconstructing polarization distribution of incident light is *** incident light beam is divided into two light beams with orthogonal polarization and then separated on the Fourier plane of a 4f *** putting proper filter on the Fourier plane, o-light or e-light can be chosen solely and be *** a half-wave plate,then,o-light and c-light can intervene with each other and be *** using a phase correction technique,the phase difference between two beams can be *** then,the polarization distribution of the incident light beam is entirely *** numerical simulation proves that the proposed method can reconstruct polarization state of a light beam effectively.

关键词： Polarization reconstructing wavefront

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Mixed-Signal Boundary Scan Test Bus Controller Design Based on AVR

Mixed-Signal Boundary Scan Test Bus Controller Design Based ...

引用

第三届国际自动化测试与仪器仪表学术会议

作者： Chen Shengjian Xu Lei Zhou Yin Wang Jinyang (Academy of Armored Forces Engineering,Beijing,100072,China)

Mixed-signal printed circuit troubleshooting presents an extremely difficult task for many electronics *** scan test technology is one of the most efficient test approaches which provides a set of standardized structures to improve the control and observability of printed circuits' *** has been a great surge in research interested in the corresponding test structures and strategies,however,the researches on boundary scan test bus controller are *** to solve aforementioned problem,an AVR based boundary-scan test bus controller design for mixed-signal printed circuits is *** AVR charges the intercommunion between the test codes and boundary scan signals automatically and makes the fault diagnosis of mixed-signal circuits become more efficient and low cost.

关键词： AVR boundary scan test bus controller mixed-signal printed circuit

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Interference Suppressing In Partial Discharge Based on LS-SVM Regression and EMD Algorithm

Interference Suppressing In Partial Discharge Based on LS-SV...

引用

第三届国际自动化测试与仪器仪表学术会议

作者： Shen Hong,Kong Xiaohong,Chen Xiqu,Du Jiaxi,Zhang Wei (Mechanical and Electrical Department,Henan Institute of Science and Technology,Xinxiang 453003,China)

In partial discharge(PD)measurements of electric power equipment there is always a lot of interference,of which periodicity narrow-band interference demonstrates strongly in both time domain and frequency domain,so it must be filtered in advance,and then white noise is dealt *** on the research of the threshold value of frequency domain and Wavelet filtering method,an improved algorithm is presented in which by use of least square support vector machine (LS-SVM)regression,and which can adapt the narrow-band interference in a wider frequency band,meanwhile,white noise is suppressed by adaptive threshold method for reconstruction of Empirical Mode Decomposition(EMD).Finally this method is used in interference suppressing of factual PD signals,the result shows that the method is effective.

关键词： Partial discharge:Narrow-band interference White noise:LS-SVM EMD

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