Table of Content

15 October 2014, Volume 34 Issue 5

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Research on Status and Prospect of Space Metrology Technology

XU Si-wei；SU Xin-guang；ZHANG Shu-feng；LIU Bi-ye；LIU Min；ZHANG Shao-nan

2014, 34(5):  1-4.  doi:10.12060/j.issn.1000-7202.2014.05.01

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Space metrology is a technology and management action to assure unified system of unit and an accurate and reliable measured value in space work which out of earth. The concept of space metrology is roundly described here. The research status and some achievements of space metrology are introduced. The development trends of space metrology are presented.

Near Field Active Millimeter-wave Cylindrical Scanning Imaging System based on Stepped Frequency Continuous Wave

WEN Xin；FANG Wei-hai；ZHANG Bing；WANG Nuan-rang；NIAN Feng

2014, 34(5):  5-9.  doi:10.12060/j.issn.1000-7202.2014.05.02

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To overcome the poor frequency linearity of the linear frequency modulation（LFM）signal, which generated by voltage-controlled oscillator（VCO）. This paper presents the near filed active millimeter-wave cylindrical scanning imaging system, which is on the basis of the stepped frequency continuous wave signal generated by direct frequency synthesis（DDS）technology. The system has the advantages of the high range resolution, high frequency accuracy and waveform generator and waveform control relatively simple. First, by the detection theory of the stepped frequency continuous wave signal, one dimensional range profile, range resolution and range blurring of the stepped frequency signal are analyzed. Second, through the wave equation the reconstruction algorithm is deduced in near field active millimeter-wave cylindrical scanning imaging system. Finally, the semi-physical simulation imaging system is set up in the anechoic chamber to verify the feasibility and effectiveness of the stepped frequency continuous wave signal applied in near filed active millimeter-wave cylindrical scanning imaging system.

Research on Standard Source of Variable Frequency Power

QIAN Cen；XU Wei-zhuan；WU Yong-hui；XU Jun-tao

2014, 34(5):  10-14.  doi:10.12060/j.issn.1000-7202.2014.05.03

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Currently, the general limitation of the output voltage and input current at home and abroad is 1 000V/80A, with the lowest frequency of 10Hz, which can not meet the actual needs of frequency electricity measuring instruments to examine. The research of the standard source of variable frequency power of wide range, could improve the system of traceability of frequency electricity, as well as change the predicament that frequency electricity measuring instruments is unable to trace and no standards can be referred to.

Design and Realization of a Cable Assembly with SMA-style RF Connector

CAI Xiao-tao；YU De-jiang；WANG Hui-feng；QU Xiao-song；ZHANG Li-min

2014, 34(5):  15-19.  doi:10.12060/j.issn.1000-7202.2014.05.04

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This paper presents a novel cable assembly with SMA-type RF (radio frequency) coaxial connector. By adopting the method of coplanaroffset and analyzing the important aspects of affecting the performance of the whole cable assembly, SMA-style RF connector is designed and fabricated to make the cable assembly. During the whole frequency band （0.01~18）GHz, the measured VSWR of the whole cable assembly is less than 1.12. The calculated VSWR of the designed connector is less than 1.06. The VSWR performance of the proposed cable assembly with SMA-type RF connector is better than the VSWR of this kind of familiar cable assembly. The simulated and measured results of the proposed cable assembly are in good agreement to validate the design.

Discussion of the Measurement of SSB Phase Noise base on a Spectrum Analyzer

WANG Lin-lin；YANG Fan；LI Kai-feng；XU Jing-jiu；XU Jun-long

2014, 34(5):  20-22.  doi:10.12060/j.issn.1000-7202.2014.05.05

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Make a measurement of SSB phase noise based on a spectrum analyzer would be simple and reduce the cost. But, there are so many attentions need to be take care during the measurement with a spectrum analyzer. All the attentions would be analyzed in this paper, in order to provide a idear for the measurement operators.

The Progress of BIRMM Two-Way Satellite Time and Frequency Transfer Modem

WANG Xue-yun1；ZHAO Bo；ZHANG Sheng-kang；WANG Hai-feng；YUAN Yuan；WANG Hong-bo

2014, 34(5):  23-26.  doi:10.12060/j.issn.1000-7202.2014.05.06

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The modem is the key equipment in two-way satellite time transfer (TWSTT).In this paper,the new progress of BIRMM TWSTFT modem is introduced. The modem has flexible configuration with multi chip-rate such as 1Mchip/s,2.5Mchip/s and 5Mchip/s and the receiver could expand to 10 channels in one module,the IF frequency is 70MHz. Referring to the test of local twoway satellite comparison,the BIRMM modem performance has been analyzed and evaluated.The test results show that,the precision of BIRMM modem within 0.3 ns.

Phase-difference Algorithm for Non-parallelism Measurement of Magnetic Sensor Array

DONG Hao；ZHOU Chang-jian

2014, 34(5):  27-29.  doi:10.12060/j.issn.1000-7202.2014.05.07

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With the development of magnetic sensor technology and magnetic detection technology, magnetic gradient tensor measurements have become a new method in magnetic detection field. However, magnetic sensors in the detection array always have non-parallelism, thus reducing the magnetic positioning accuracy. A simple and convenient method called phase-difference algorithm is presented for measuring the non-parallelism of the sensors. Testing results indicates the validity of the method.

Calibration Device for Anodizing Voltage Controller based on Virtual Instrument Technology

MENG Qi

2014, 34(5):  30-33.  doi:10.12060/j.issn.1000-7202.2014.05.08

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This article presents the research of the calibration device for anodizing voltage controller, the system software and hardware are explained. The calibration device can be used to calibrate anodizing voltage controller, and the calibration result met the anodizing surface treatment process specification of airplane’s aluminium alloy parts.

Development of Portable Gamma Ray Irradiation Facility for On-site Calibration

GAO Fei；NI Ning；SONG Ming-zhe；HOU Jin-bing

2014, 34(5):  34-37.  doi:10.12060/j.issn.1000-7202.2014.05.09

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Fixed environmental gamma radiation dose rate monitoring instrument is the main equipment to undertake environmental continuous monitoring tasks, such instrument is usually not easy to remove and install, and the submission of a longer period (about a week), affecting the continuity of the continuous monitoring data.For the on time calibration of fixed environmental gamma radiation dose rate monitoring instrument, combined with the Monte Carlo method developed a portable ¹³⁷Cs irradiation device, PTW dosimeter was used to measure dose rate of the radiation field. Finally, portable radiation device was used to carry out on-site calibration experiments for the fixed environmental gamma radiation dose rate monitoring instrument.

Research on Atmospheric Pressure Sensor Field Calibration Device Technology for Near Space

YANG Shui-wang；JIANG Feng；YOU Fu-chu；LI Dai-song

2014, 34(5):  38-42.  doi:10.12060/j.issn.1000-7202.2014.05.10

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This paper deals with the field calibration needs of atmospheric pressure sensor for near space, introduces the principle of atmospheric pressure sensor field calibration device for near space, complete the theoretical analysis and simulation, point out the key technology need to overcome, and gives the Uncertainty estimation.

Implement of Piezoelectric Excitation and Piezoelectric Detection on the Resonant Sensor for Liquid Density Measurement

SHI Ji-ying；ZHENG De-zhi

2014, 34(5):  43-48.  doi:10.12060/j.issn.1000-7202.2014.05.11

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The sensor for liquid density measurement based on the resonance theory is driven and detected based on the piezoelectric effect and inverse piezoelectric effect in this paper. The automatic gain control (AGC) circuit based on piezoelectric excitation and piezoelectric detection with simple structure and low power consumption is designed, when the output signal of sensor changes large, the gain of excitation signal can be automatically adjusted with the output signal amplitude so that the output signal amplitude remains stable. The circuit has many advantages, for example simple structure, good flexibility and reliability, fast speed of response and so on. Meanwhile, the calibration experiments are taken, and results conform that the repeatability error is about ±0.05% and the accuracy is about 1.0kg/m³. In a word, the sensor designed in this paper can achieve liquid density measurement online with high precision in real-time.

Research on Temperature Effect on the Measurements of Hull Blocks based on Total Station

GUO Yi-ming；YIN Yi-yong

2014, 34(5):  49-54.  doi:10.12060/j.issn.1000-7202.2014.05.12

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According to the same ambient temperature and the same material under different ambient temperatures on the shaft portion of the hull, a plurality of target points for repeated measurements of the same configuration are measured, observing the changes in the total station measurements, with analyzing errors caused by changes in the ambient temperature and providing the reliable data to support the accuracy of the ship construction process.

A Method for Measuring the High Surface Temperature of New Carbon Composite Materials on Aircraft

ZHAO Bo；LU Jing-hua；DU Hai-hui；YI Hui；YANG Shui-wang

2014, 34(5):  55-57.  doi:10.12060/j.issn.1000-7202.2014.05.13

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This paper deals with the high surface temperature measurement of the new carbon composite materials on aircraft, introduces the method measurement, the installation method of senor, the technique with high temperature adhesives, sensor and thermal protection, and summarizes the features of this method.

Acoustic Parameters Measurement of Underwater Acoustic Materials based on Transfermatrix and Wide Frequency Impulse Method

WANG Shao-bo

2014, 34(5):  58-60.  doi:10.12060/j.issn.1000-7202.2014.05.14

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This paper presents the material longitudinal wave velocity and attenuation coefficient measurement of underwater acoustic materials using transfer-matrix calculation plus impulse method. Describes the method using monostatic transducer, broadband impulse signal generation and sample measurement results. Completed the measurement uncertainty analysis.

Prepareation of Standard Solution of Reserpine in Methanol Aqueous for LC-MS Calibration

LI Yan-ling；ZHOU Tong；JI Ke-jian；LIU Yuan-jun；GAO Yan-li；ZHAO Xiao-gang

2014, 34(5):  61-64.  doi:10.12060/j.issn.1000-7202.2014.05.15

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Standard solution of reserpine in methanol aqueous for LC-MS calibration was developed. The puriety of reserpine powder was certified with credible methods. The standard solution was prepared by weight-volumetric method using the reserpine powder as solute and the methanol aqueous as solvent. Uniformity and stability of standard solution was analyzed by F test and regression curve method respectively, the uncertainty of the results was evaluated. The result showed that uniformity and stability of the standard solution of reserpine in methanol aqueous was better, the relative standard uncertainty of concentration was 3%（k=2）.

Research on Development and Application of Measurement Uncertainty

CHEN Huai-yan；CAO Yun；HAN Jie

2014, 34(5):  65-70.  doi:10.12060/j.issn.1000-7202.2014.05.16

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Measurement uncertainty is a non-negative parameter characterizing the dispersion of the quantity values being attributed to a measurand, and it is associated with the measurement result and is the quantitative expression for the quality of the measurement result. Measurement uncertainty indicates the reliability of the measured values. Measurement uncertainty applies to all kinds of the measurement fields including science, technology, and engineering. The research on theory and application of measurement uncertainty have continuously been deepened. As the International System of Units has been closely linked with measurement and used all over the world, measurement uncertainty will play an important role in the measurement fields. The spread of measurement uncertainty is a specific and hard and basic work, which is involved in many fields and is difficult, and then it should be paid attention. This article gives a good overview about development and application.

Evaluation of Measurement Uncertainty on Noise Parameters of Low Noise Package Device

WU Ai-hua；LUAN Peng；LIANG Fa-guo；LIU Chen；ZHENG Yan-qiu

2014, 34(5):  71-75.  doi:10.12060/j.issn.1000-7202.2014.05.17

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A study on the evaluation of measurement uncertainty of a super fast noise parameters measurement system, which consists mainly of an automatic impedance tuner produced by Maury Microwave Corporation and Agilent PNA-X VNA equipped with an internal low noise figure measurement receiver, is introduced. This paper gives a thorough analysis of system’s input and output data, based on which a new measurement model is developed independently by us, and a new method of evaluating measurement uncertainty is designed according to the international standard of ISO/IEC98-3. A simulation software developed by the authors of this paper is used to obtain the measurement uncertainty data of four noise parameters, giving the best estimated data and probability distribution.It is we reported for the first time.

Evaluation of Measurement Uncertainty of Gas Mass Flow Meter Calibration Apparatus with Xenon

WEI Wan-yin；LI De-tian；FENG Yan；CHENG Yong-jun；GUAN Bao-guo

2014, 34(5):  76-78.  doi:10.12060/j.issn.1000-7202.2014.05.18

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In this paper the measurement model of gas mass flow meter with xenon was set up, measurement uncertainty was analysed, the relative combined standard uncertainty of calibration apparatus was given, then the evaluation results were discussed.