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Kang W.,Beijing Orient Institute of Measurement and Test | Yang C.,Lanzhou Institute of Physics | Jiayun S.,Beijing Orient Institute of Measurement and Test | Min L.,Beijing Orient Institute of Measurement and Test
3rd IEEE International Workshop on Metrology for Aerospace, MetroAeroSpace 2016 - Proceedings | Year: 2016

Free space electric field sensor is the important load of satellite to obtain the information of electric field. Analysis of electric field offers a lot of information to the study area of earthquake monitoring, thunderstorm monitoring and radio wave propagation, improving the ability of major natural disasters monitoring. Owing to the high precision of sensors, it's necessary to test the electrical character aground before working in outer space. The paper describes the measurement method, system and results of free space electric sensor. © 2016 IEEE.


Bai X.,Beijing Orient Institute of Measurement and Test | Zhang Y.,Beijing Orient Institute of Measurement and Test
Proceedings - IEEE 2011 10th International Conference on Electronic Measurement and Instruments, ICEMI 2011 | Year: 2011

A control software is designed for a data management equivalent device about the calibration. As a new design method, it is to add self-calibration method to data management equivalent device of satellite, making the calibration into the device itself, which improves the dependability of the system. Research on the self-calibration function, it is used the least square basic principle to curve fitting for calibrating the AD of the hardware, and improve sampling resolution. On the basis of the average segmentation of parameter calibration, which could improve the accuracy of the test for the device. The paper expounded the designing to software. The designing indicates that the calibration can fulfill the equivalent device, reasonable designing of the software. © 2011 IEEE.


Kang W.,Beijing Orient Institute of Measurement and Test | Yalu L.,Beijing Orient Institute of Measurement and Test | Xiaojun Y.,Beijing Orient Institute of Measurement and Test | Li Y.,Beijing Orient Institute of Measurement and Test
CPEM 2016 - Conference on Precision Electromagnetic Measurements, Conference Digest | Year: 2016

The paper describes a large capacitance measurement system based on a dual balance bridge and sampling technology range from 10μΚ to 10mF at 100Hz. The optimum measurement uncertainty is 1×10-4(A=2). © 2016 IEEE.


Li Y.,Beijing Orient Institute of Measurement and Test | Haibin J.,Beijing Orient Institute of Measurement and Test | Zhiyuan H.,Beijing Orient Institute of Measurement and Test
CPEM 2016 - Conference on Precision Electromagnetic Measurements, Conference Digest | Year: 2016

The paper describes a calibration for a differential phase measurement system frequency from 5 Hz to 1 MHz based on two dual-channel high-speed digitizers controlled by National Instrument multiple instruments synchronization technology. The measurements compared single-end sampling mode and differential mode, and extra phase calibration experimental for differential phase measurement system. Phase measurement jitters are observed on differential mode. The results indicate the differential phase measurement is accuracy enough for calibration. © 2016 IEEE.


Liang H.,Beijing Orient Institute of Measurement and Test
Proceedings of SPIE - The International Society for Optical Engineering | Year: 2010

Precision through-lines, coaxial airlines, are the most accurate microwave impedance standards. They are widely applied in the TRL calibration method. The air-lines are also important standards which are used to test network analyzer systems. In addition, the scattering parameter and uncertainty of coaxial air-line are important for improving the accuracy of VNA. However, the conventional microwave measurement systems have limitations in observing and obtaining accurate information of the performance of coaxial air-lines. In this paper, a new approach is proposed that determines microwave scattering parameter by physical components and assumed models. Experimental results demonstrate the efficacy of the proposed algorithm in comparison to the experimental results obtained from microwave measurement. In addition, the estimated uncertainty is also presented. © 2010 SPIE.


Pei Y.,CAS Institute of Semiconductors | Wu H.,CAS Institute of Semiconductors | Liu J.,Beijing Orient Institute of Measurement and Test
Journal of Semiconductors | Year: 2015

β-graphyne, a carbon allotrope, is a gapless semiconductor with hexagonal lattice symmetry, just like graphene. We calculated the optimized structure and electronic structures of some possible three-dimensional β-graphyne stacking arrangements by means of the first-principles frozen-core projector augmented-wave method implemented in the Vienna ab initio simulation package. The optimized lattice constant a of the three-dimensional β-graphyne turns out to be 9.46 Å, which is slightly smaller than its two-dimensional counterpart. The binding energy is about 90% of that of graphite, which suggests that three-dimensional β-graphyne will be stable when it is synthesized. The band structure is calculated via the hybrid functional. We found that the most stable three-dimensional stacking arrangement is an indirect band gap semiconductor with an energy gap of 0.1 eV. © 2015 Chinese Institute of Electronics.


Min L.,Beijing Orient Institute of Measurement and Test
2014 31th URSI General Assembly and Scientific Symposium, URSI GASS 2014 | Year: 2014

Here distinguish concept of electrostatic capacitance from alternating current (Ac) capacitance, and give a calibration method for electrostatic capacitance. Considering a capacitor, there are two values of Ac and electrostatic capacitance. Both values are same only under ideal condition, yet are difference in actual conditions of considering series and parallel resistance. Two rules must be obeyed when tracing the electrostatic capacitance to Ac capacitance standard. Other than the method of using voltage source and Coulomb meter, a new measurement method is put forward by paralleling a known capacitor to calculate unknown capacitance. For instance to calibrate a metal plate capacitance on a kind of instrument named Charged Plate Monitor (CPM, also called Charge Analyzer), The measurement uncertainty is about 2%. © 2014 IEEE.


Gao J.,Beijing Orient Institute of Measurement and Test | Tu Z.,Beijing Orient Institute of Measurement and Test | Hang B.,Beijing Orient Institute of Measurement and Test | Zhao H.,Beijing Orient Institute of Measurement and Test
2015 IEEE 12th International Conference on Electronic Measurement and Instruments, ICEMI 2015 | Year: 2016

Several traceability methods of low voltage ac-dc transfer standard are introduced here. The components and theories of the calibration system including step down, resistance voltage divider, binary and decimal inductive voltage divider are briefly analyzed, also the characteristics of the traceability methods and the important factors that affects the accuracy of the measurements are pointed out. © 2015 IEEE.


You L.,Beijing Orient Institute of Measurement and Test | Jin H.,Beijing Orient Institute of Measurement and Test | Hu Z.,Beijing Orient Institute of Measurement and Test
2014 31th URSI General Assembly and Scientific Symposium, URSI GASS 2014 | Year: 2014

Resistive voltage dividers play a key role in the installation of AC power or phase standard. The article analyzes the phase-frequency characteristics of two with and without buffer resistive voltage dividers in digital sampling method, and it could be important reference for development of AC power or phase standard. © 2014 IEEE.


Sun W.,Beijing Orient Institute of Measurement and Test
Advanced Materials Research | Year: 2013

To address the problems of low efficiency, high cost and low automatic level existing in traditional laser tracking measurement systems, a laser tracking-vision guiding measurement system for large-scale parts assembly is introduced in this paper. The system is composed of mono-camera and a laser tracker, can fulfill real-time tracking and automatic measurement throughout the whole assembly process. A global calibration method based on public planes and a method for finding the 3D positions of the target reflectors based on monocular vision measuring are expounded. Mathematical model is established, measurement system is built, and the experiment is accomplished. The experiment result indicates that the proposed system features relative high degree of automation and high measuring speed, has future in practical application. © (2013) Trans Tech Publications Switzerland.

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