Table of Content

25 February 2017, Volume 37 Issue 1

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Discussion on the Definition of Basic Physical Units in Space Metrology

LIU Min;PENG Ming;LIU Bi-ye

2017, 37(1):  1-6.  doi:10.12060/j.issn.1000-7202.2017.01.01

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Modern metrology theory are base on truth of “the space is straight and flat in Euclid space”,“Mass of matter obeys conservation law”,and “light line is along straight”.But the General Relativity (GR) theory is shaking the root of modern metrology by “curve of space-time” and “gravitational red shift”.In large scale space out of the earth,in difference gravity potential,and considering the fourth state of matter-plasma,the basic units of physical needs research its define.Frequency measurement is influenced by gravitational red shift,clock speed is different with gravitational change.Navigation satellite adjusts its time unit according to relativistic theory formulae to unify system time measurement.The length unit depends on light speed constant and time measurement,also subject to relativistic effect.Because light line is curved by gravity,the distant unit of light-year which descript large span in space is difficult to define.Voltage unit trace to microwave frequency unit by means of Josephson’s effect,are also affected by relativistic effect.In space plasma,electrons and ions keep themselves temperature,because they have difference average kinetic energy.There are two conditions hide in definition of thermal temperature unit that conditions must be equilibrium and state of disorder or randomness.If weather the definition of dynamic temperature dose only include disorder average kinetic energy,in case of particles streams toward certain direction.The famous formula E=mc² told us that mass of matter is not conservation.Mass of matter could change with its energy.Space metrology is new field of metrology.In large span space out of earth,space metrology will unify physical units,ensure human being to measure accuracy in space.It will become development orient of space metrology theory study that the space physical units are redefined according to modern science principle.

Research on Measurement Assurance in the Quality Management of Products

WU Qian；WANG Zhe

2017, 37(1):  7-9.  doi:10.12060/j.issn.1000-7202.2017.01.02

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Measurement assurance is an important part of the quality management of products.It is an important means to ensure the unity production, testing and use, and the accurate and reliable value of the quantity, to support the development of innovation and ensure the quality of products.After years of development, has been gradually integrated into the type of measurement to ensure the quality of work, and through the quality management regulations, measurement supervision and management regulations and other regulations and standards will be further consolidated, provided strong support for scientific research and production.In the new period, the development of products has brought new demands, new problems and new challenges to the measurement guarantee work.This paper analyzes the present situation, development needs and existing problems of measurement assurance and puts forward some suggestions for the later work.

Design of a Gigahertz Transverse Electromagnetic Cell with Two Test Zones

2017, 37(1):  10-13.  doi:10.12060/j.issn.1000-7202.2017.01.03

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As a kind of important electromagnetic test sites,Gigahertz Transverse Electromagnetic (GTEM) Cell possesses the advantage of high field strength and high energy efficiency compared to traditional open test sites and microwave anechoic chamber In this paper,a high performance GTEM Cell with two test zones used for electromagnetic susceptibility test is designed,which operates from DC to 4 GHz and the field strength can reach a level of more than 400 V/m.

Analysis on Metrology Specifications and Methology of Calibration for Microwave Landing System Simulator

LEE Qiong-wei；CAI Ying

2017, 37(1):  14-18.  doi:10.12060/j.issn.1000-7202.2017.01.04

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The authors start with the comprehensive demonstration of performance specifications of MLS stimulator to establish the parameter system for stimulator verification/calibration.Then,based on the principle of angle guidance,they convert the parameters of guidance angel signal to general pulse parameters and reach the value of respective parameters,which can make angle guidance signals measured by normal measurement equipments and traced back to the national standards by uninterruptible traceability chains.They lastly bring forth with the methology of verification/calibration accordingly.The analysis conclusion has dissolved technical obstacles for MLS simulator support and made the MLS specifications accurate and consistent.


Analysis of the Influence of the Waveform Parameters of DME Pulse Modulation Signal on the Spatial Spectrum Occupancy

FANG Cheng

2017, 37(1):  19-24.  doi:10.12060/j.issn.1000-7202.2017.01.05

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The DME signal of Gauss double pulse modulation format is applied to the development, debugging and performance verification of DME system.Because of the complexity and high cost of the special DME signal simulator, research staff often use the analog signal source with fast dual pulse modulation instead Based on DME signal requirements，this paper analyzed the possible problems of this substitution，and verified the power spectrum occupancy of Gauss double pulse and rectangular pulse modulation signals under different edge of pulse conditions by experimental tests.The results are consistent with the analysis，indicating the substitution has its limitations.

Design and Analysis of a Novel Range Gain Calibration Method for DC Voltage Source

YU Xue-feng；YU Jie；ZHANG Hong-qing；WANG Ke

2017, 37(1):  25-28.  doi:10.12060/j.issn.1000-7202.2017.01.06

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Deal with the problem of range gain calibration for DC voltage source in calibration laboratories, in this paper, a novel method was proposed by which the range gain of a device under test (DUT) can be directly calibrated using one reference calibrator and one multimeter.Thus the calibration errors only depended on the technical indexes of selected equipments.The method was easy to be implemented in general laboratories and can be fully automated.Experiential results show that, compared with traditional resistive divider techniques, the novel method can achieve almost the same calibration accuracy.The calibration expanded uncertainty is better than 0.3 μV/V up to 1 000 V.

Research on Forward DC-DC Converter Controlled by Synchronous Control Technology

ZHANG Ting；Huang Shi-qi；WANG Zu-liang

2017, 37(1):  29-34.  doi:10.12060/j.issn.1000-7202.2017.01.07

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In order to improve the cross regulation of dual-output DC-DC forward converter,and enhance the output voltage accuracy and dynamic performance of the power supply in the application environment that the output loads will change,a main and auxiliary synchronous control strategy is proposed.Calculate out the two output powers and make a comparison between them,and then on the basis of rules set in advance to determine which the main circuit is,and also the other is the auxiliary circuit corresponding.The main circuit adopts closed-loop PID control,and auxiliary circuit uses the improved hysteresis current control strategy,both of them adjust the duty cycle of the switch tube simultaneously.Make a simulation on the work process of the forward converter adopting the proposed strategy in MATLAB/Simulink and complete the hardware circuit,the simulation and experimental results show that both the main and auxiliary circuits have high output voltage precision when one load changes.It improves the cross regulation problem,and also verifies the design is feasible.

Application of IIR Filter in Chip-scale Atomic Clock

RUAN En-mei；WU Hong-wei；CHEN Jie-hua；GU Si-hong

2017, 37(1):  35-38.  doi:10.12060/j.issn.1000-7202.2017.01.08

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Chip-scale atomic clock (CSAC) is a type of miniaturized coherent population trapping (CPT) atomic clock with small scale and low-power.In this paper,we adopted the design of IIR filter to deal with output signal of CSAC.The design can help reduce the volume and improve short-term frequency stability of CSAC The experimental result shows  that resources IIR filter occupied is reduced by nearly 58% while compared with FIR filter.Besides,the short-term frequency stability of CSAC is improved by 1.4×10^-10τ^-1/2（τ=1s-100s）and the circuit size is reduced by 10% when compared with analog filter.

Study on Temperature Field Test based on the Numerical Simulation

WEN Ze-qiang;SU Wei;CHE Bin

2017, 37(1):  39-41.  doi:10.12060/j.issn.1000-7202.2017.01.09

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In this paper we get the three dimensions distribution map of the temperature field for the test chamber which can directly and expediently understand the specific distribution of the temperature field of environment test chamber,through in arranging some appropriate testing point in the environment temperature test chamber ,using interpolation and appropriate function fitting method and an infinite detailed three-dimensional matrix to simulate the temperature distribution of the test chamber based on the actual data collected of the testing point.This simulation and analysis only aimed at special section of the rectangle test chamber.

Theoretical Study and Test Technology of the Moving Magnet Linear Motor

XI Zhong-li；XIA Ming；CHEN Jun

2017, 37(1):  42-47.  doi:10.12060/j.issn.1000-7202.2017.01.10

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This paper is based on the SC100H linear Stirling Cryocooler which has been designed by Kunming Institute of Physics.The theoretical and experimental study has been used in analyzing the magnetic circuit characteristics of the moving magnet linear oscillation motor.In this paper,a theoretical model of the motor is established,and the structure of the model is simplified in order to analyze and calculate the model.By using the equivalent circuit methods and the principle of electromechanical energy conversion,the relationship between the thrust characteristic of the motor and the relative position of the rotor is analyzed.We also build a test experiment rig by using the force testing system and the relationship between the thrust characteristic of the motor and the input current were tested.The test results are consistent with the theoretical value very well,which provides a design basis for the design and optimization of structure parameters and operation parameters of the motor.

On-site Calibration Technique for Helicopter Vibration Sensors in Low Frequency Range

YANG Lin；ZHENG Shu-li

2017, 37(1):  48-54.  doi:10.12060/j.issn.1000-7202.2017.01.11

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This paper presents a technique to fill the void in on-site calibration of accelerometers in helicopter health and usage monitoring systems (HUMS) within low frequency range.The technique employs a compact linear-motor-driven reference vibration exciter and a thermo-stabilized quartz flexible accelerometer to construct a portable,precise,and stable calibrating apparatus,which is quite fit for the on-site calibration of helicopter HUMS. According to the uncertainty estimation and calculation,an expanded calibrating uncertainty (k=2) of no more than 1% is expected of the apparatus over the frequency range of 0.5 Hz~20Hz and the acceleration range of 0.01 m/s²~20 m/s².

Research on Sinusoidal Dynamic Pressure Calibration based on Virtual Instrument

2017, 37(1):  55-59.  doi:10.12060/j.issn.1000-7202.2017.01.12

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According to the dynamic calibration needs of pressure transducer,a method of sinusoidal dynamic pressure calibration based on virtual instrument is proposed.The system of sinusoidal dynamic pressure calibration based on Labview is designed in this paper,including overall design schemes,hardware configuration and software control.This paper also performs a test on the system of sinusoidal dynamic pressure and gives the uncertainty evaluation.The result shows that the method is feasible and effective and it meets the need of dynamic pressure measurement in aerospace and industrial areas.

Design and Implementation on the Flow Measurement and Control Equipment Calibration System of the Engine

HUANG Jian-ming；CHANG Ying；SUN Xin-xin

2017, 37(1):  60-65.  doi:10.12060/j.issn.1000-7202.2017.01.13

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In order to verify the accuracy and reliability of the engine flow measurement and control equipment,in the paper,a set of the calibration system for flow measurement and control equipment is established,realize the calibration of the engine flow measurement and control equipment.The uncertainty analysis of the engine flow measurement and control equipment is completed,and the key hardware system of the calibration is built,the software system of the calibration is developed,so realize the automatic control and calibration of the engine flow measurement and control equipment,the calibration system has the characteristics of flexible configuration and simple operation.

Research on Absolute Measurement Methods of Radon Activity Measurement

ZHANG Xi

2017, 37(1):  66-71.  doi:10.12060/j.issn.1000-7202.2017.01.14

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In order to accurately measure the radon activity,different methods of radon activity measurement were established in all countries.The traditional methods of radon measurement,including the ionization chamber method and the scintillation chamber method of radon measurement are used as relative method of radon activity measurement,with a higher degree of uncertainty,and the value of the source depends on the characteristics of standard material of radium.In this paper,the absolute measurement methods of radon activity measurement are introduced in this paper,comprising the absolute measurement method of condensation small solid angle,the absolute measurement method of multi-electrode proportional counter and the absolute measurement method of small scintillation chamber.Through the introduction and analysis of the theory and experimental device,the characteristics of various absolute measurement methods are discussed and compared.

Simulation of Three Dimension Distribufion of Electric Field in GEM-TEPC and Methods to Study of its Effective Gain

LI Chun-juan；ZHANG Wei-hua；XIAO Xue-fu；WANG Zhi-qiang；LIU Yi-na

2017, 37(1):  72-75.  doi:10.12060/j.issn.1000-7202.2017.01.15

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To optimize the design of tissue-equivalent proportional counter(TEPC) and make it satisfy the measurement of radiation field with high fluence rate, we set up a TEPC based on a Gas Electron Multiplier（GEM）.The effective gain is very important for GEM-TEPC, and the key factors affecting the effective gain are the voltage of GEM electrode, the drift area field, collected area field, the gas components filling into sensitive area and the gas pressure.Three dimension distribufion of electric field in GEM-TEPC were simulated with code ANSYS, and the way how to simulate the maximum safe gain of GEM-TEPC with code Garfield and the way how to measure the maximum safe gain were studied.


Analysis on the Determination of Verification Period of Special Testing Equipment

LI Yu-ling；LI Zong-kun；ZHANG Chuan-qiu；GAO Xin-fang

2017, 37(1):  76-80.  doi:10.12060/j.issn.1000-7202.2017.01.16

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There is no uniform standard for the verification period of the special testing.In this article,the method of determining the verification period of special testing equipment is given by using the method of comprehensive weighted score and fixed step adjustment,and an example is given.