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2018 Vol. 39, No. 6A
Published: 2018-12-22
 
1 Research on Calibration Technology of Gyro North-finder
CAI Ying
DOI: 10.3969/j.issn.1000-1158.2018.z1.01
Aimed at the metrology support requirements of weapons found north orientation equipment, on the basis of analysis about the technology at home and abroad, the calibration technology of gyro north-finder is studied. A North benchmark with self-check function is designed, which also sets up three north benchmarks, one is collimation normal north benchmark, the other two are infinity target north benchmark. The system has realized the calibration for different types of gyro north-finder. A northbound error correction method based on north benchmarks correction principle is proposed, which can monitor the drift and deformation of the north benchmark, and can realize the self-calibration of the whole north benchmarks. Infinity target location technology is adopted to establish the alignment model based on the known target azimuth, which solves the problem of accurate reset of gyro north-seeker rotation center. The astronomical orientation method is used to assign north to three north benchmarks. The precision of the introduced three northward azimuthal angles are better than ±0.5″. The practical application shows that the system is reasonable in design, reliable in use and stable in performance, it can be used as the standard equipment for measuring gyro north-finder.
2018 Vol. 39 (6A): 1-6 [Abstract] ( 278 ) HTML (1 KB)  PDF (545 KB)  ( 531 )
7 Research on Measurement Method of Shape Accuracy of Spaceborne Large Expandable Mesh Antenna
DING Jian,YUAN Bao-feng,LIU Zhi-yong,XU Zhe,TAN Li-meng,YIN Ke
DOI: 10.3969/j.issn.1000-1158.2018.z1.02
Shape accuracy is one of the key indicators for evaluating the performance of large spaceborne antennas. Based on three-dimensional coordinate measurement, the measurement and calculation method of large-scale expandable mesh antenna shape accuracy was introduced. By using the theodolite measuring system, photogrammetry system and laser scanner, a comparative experiment was designed to measure the shape accuracy of a large expandable mesh antenna model for a certain model, and the advantages and disadvantages of the three measurement methods were compared. The conclusions have guiding significance for the evaluation of the shape accuracy of the same type of spaceborne large expandable mesh antenna products.
2018 Vol. 39 (6A): 7-10 [Abstract] ( 351 ) HTML (1 KB)  PDF (975 KB)  ( 878 )
11 Real-time Monitoring Techniques of Optical Path Micro-change Based on Two-channel Multi-beam Interference
HUANG Wei,GAO Hong-tang,ZHANG Fu-min,WEI Bing-ying
DOI: 10.3969/j.issn.1000-1158.2018.z1.03
A micro-optical path measurement system based on the principle of multi-beam interference using two channels is introduced. The system that can measure the micro-change of optical path caused by the change of air refractive index has high measurement sensitivity. And the measurement sensitivity can be verified by a simple experiment, which uses the acoustic wave to change the refractive index of the air and further change the optical path length. The experimental results of the system are compared with those of the Michelson interference method. It is concluded that this system can achieve high measurement sensitivity with small interference arm, while the Michelson interference system are in the case of the large interference arm. The measurement of the optical path variation can be applied in many fields, and the experimental system has the characteristics of miniaturization, which can provide the technical basis for the application in the related fields.
2018 Vol. 39 (6A): 11- [Abstract] ( 293 ) HTML (1 KB)  PDF (964 KB)  ( 529 )
16 Calibration Method of Spindle Rotation Error Analyzer
YUAN Xing-qi,SHU Hong-lin,CUI Jian-jun,YAN Yong-gang, MAO Bin,CHEN Kai,SHAO Hong-wei
DOI: 10.3969/j.issn.1000-1158.2018.z1.04
In view of the difficult calibration of the spindle rotary error analyzer for ultra-precision machine tools, the system composition and measurement principle of the spindle rotary error analyzer were analyzed, and a calibration method based on indication error, linearity and repeatability was proposed. A special calibration device was built, the device uses nanometer micro-motion table to drive the displacement. Using high precision laser interferometer as measurement standard, the measuring line conforms to Abbe principle, it can be realized under normal experimental conditions. The optimal measuring ability is better than 10 nm in the displacement range of ±1 mm, and the stability of the indication value is better than 2 nm in 10 minutes. The calibration test of spindle rotation error analyzer was carried out, and the evaluation method of uncertainty was given. The calibration method and device can meet the requirements of spindle rotation error analyzer and various nanometer displacement sensors and instruments.
2018 Vol. 39 (6A): 16- [Abstract] ( 341 ) HTML (1 KB)  PDF (1082 KB)  ( 400 )
22 Research on Non-contact Measurement System of Dynamic Envelope
GAN Xiao-chuan,ZOU Zhi,MA Li-qun
DOI: 10.3969/j.issn.1000-1158.2018.z1.05
The development of railway boundary measurement technology is briefly analyzed, the three main methods of dynamic boundary acquisition are summarized, and their advantages and disadvantages are compared. A monocular vision measurement scheme based on digital camera is proposed, and a non-contact measurement method of dynamic bound is realized. The measurement principle, target characteristic analysis, spot position calculation and high-speed image storage system design are introduced. According to the requirements, the key parameters of camera and image acquisition card are given. The requirement of continuous write speed is analyzed, the solution is porposed, and the continuous write speed of high-speed storage system is tested. The repeatability of image measurement and the error of displacement measurement are verified by several experiments, which meet the requirements of design and application. The measurement capability of the system is verified by vehicle test.
2018 Vol. 39 (6A): 22- [Abstract] ( 246 ) HTML (1 KB)  PDF (988 KB)  ( 266 )
28 Research on Calibration Technology of Dynamic Positioning Errorof Laser Tracker Based on Velocity Triangle Wave
LING Yan-tong,MA Li-qun,LI Yang
DOI: 10.3969/j.issn.1000-1158.2018.z1.06
As a large-size precision coordinate measuring instrument, the precision of dynamic positioning error of laser trackers is concerned, however, it's calibration is still in the state of static calibration and dynamic tracking performance calibration. Under the premise of lacking the calibration of the dynamic positioning error of the laser tracker, a method for calibrating the dynamic positioning error of laser tracker on the basis of the speed triangle wave is put forward. The rule and motion trajectory of the moving object in the calibration model are analyzed, at the same time, the calibration experiment of laser tracker is designed, the result proves the feasibility and necessity of the calibration scheme, and gives a more detailed definition to the maximum measuring speed.
2018 Vol. 39 (6A): 28- [Abstract] ( 241 ) HTML (1 KB)  PDF (1086 KB)  ( 382 )
33 Influence of Varying Load on Angle Mesurement Deviation of Rotary Table and Self Calibration Comprehension
HOU Jia,XUE Zi,HUANG Yao,YE Shu-liang
DOI: 10.3969/j.issn.1000-1158.2018.z1.07
The load of angular position rotary table is always varying in practical working condition. The mechanism was studied on how the varying load affects the position relation between scale disc and rotary axle, and then affects the angular measuring deviation. Both of the functional relations of eccentricity-angular deviation and inclination-angular deviation were deduced. The numerical simulation experiment was carried out to obtain the ideal deviation amplitude and the Fourier components order distribution under the conditions of different eccentricity and inclination. At meantime, the in-situ calibration experiment was carried out to obtain the practical deviation amplitude and the Fourier components order distribution under the condition of varying load. Finally, the effect of typical varying load on angular measuring deviation was presented and the theoretical analysis was proved.
2018 Vol. 39 (6A): 33- [Abstract] ( 247 ) HTML (1 KB)  PDF (640 KB)  ( 210 )
38 A Rapid Dimensional Measuring System for Ranged Gaps on Freeform Shape
ZHOU Sen,XU Jian,TAO Lei,YAN Yu,JIANG Cong,ZHONG Hua
DOI: 10.3969/j.issn.1000-1158.2018.z1.08
According to 3D geometric characters of ranged gaps on freeform shape, a novel rapid dimensional measuring system integrating laser scanning technologies and virtual measuring environments was developed. Based on the geometric information of acquired feature points of measured gap, the view angle and scanning depth of laser scanner can be determined step by step, thus automated generating an effective sampling path. Then, the positions of feature points have been identified and located by the respect of their absolute difference in the finding direction. In the global coordinate, the shape of measured ranged gaps was constructed by critical feature points set based on non-linear least-square method and the geometric dimensional can be also real-time obtained. The experiments on special gap artifact (200 mm×50 mm×32 mm) with freeform curve and multi-scale features were carried out to determine the accuracy and reliability of measuring system, the experimental results indicate that the dimension of gap artifact, including width, depth and flush, were perfectly measured in only 60s with the resolution less than 0.005mm and the measuring precision over 0.025mm. According to the actual operation results, the proposed measuring system is characterized by high automation and high efficiency, and can be well acceptable for application as online dimensional inspection for range gap on freeform shape on the automobile or aerospace production line.
2018 Vol. 39 (6A): 38- [Abstract] ( 288 ) HTML (1 KB)  PDF (2238 KB)  ( 245 )
45 Effect of the Straightness of Ultra-Long Guide Rail on Length Measurement Using Laser Interference Principle
YANG Wei-min,YAN Hao,YAN Jun-fang,GAO Peng,GUAN Zhe-min
DOI: 10.3969/j.issn.1000-1158.2018.z1.09
Applying space analytic geometry method to analyze the change of laser optical path length due to the change of the spatial position of the cube-corner retroreflector caused by the straightness of ultra-long guide rail theoretically, and establish the mathematical model. Then, using the actual measurement of rail straightness of Super-range laser universal measuring machine to analyze the effect of the straightness of guide rail on the indicating value of laser length measurement. Finally, it is concluded that the error of laser length measurement caused by the straightness of guide rail is less than 0.1μm in 26m according to Abbe's principle.
2018 Vol. 39 (6A): 45- [Abstract] ( 311 ) HTML (1 KB)  PDF (378 KB)  ( 197 )
49 A Method for Calculating Signal Period Based on Correlation Analysis in Roundness Measurement
XU Xiao-xuan,KANG Yan-hui,QIU Zu-rong,MA Ai-wen
DOI: 10.3969/j.issn.1000-1158.2018.z1.10
A solution to circumferential closure is discussed when roundness is measured by a single probe for field.The frequency domain characteristics of the measured signal was analyzed by the Fourier transform to obtain the frequency components of the signal, and its effects of noise and drift on them were eliminated by filtering.A method based on correlation analysis was proposed to accurately obtain the measurement signal period, and the correctness and reliability of the method are verified by MATLAB simulation analysis.The periodic calculation error as the frequency and amplitude of the signal was obtained by changing the frequency and amplitude of the measured signal (i.e.the rotational speed and eccentricity of the roundness measurement) respectively.The results show that the period calculation error decreases with the increasing of frequency, that is, the higher the frequency is, the closer the period obtained by this method is to the actual period of the signal.However, when the frequency is a constant, the period calculation error value does not change significantly with the amplitude.
2018 Vol. 39 (6A): 49- [Abstract] ( 309 ) HTML (1 KB)  PDF (343 KB)  ( 469 )
53 Question on Calculation of Uncertainty in Measurement of Cylinder Volume
QU Yu-fu,WANG Zhong-yu,ZUO Si-ran,HU Yong-bo,QIAN Zheng
DOI: 10.3969/j.issn.1000-1158.2018.z1.11
According to the synthetic process of the indirect measurement uncertainty of the national standard, the formula for calculating the uncertainty of the cylinder volume calculated from the measured values of the diameter and height of the bottom surface is derived. The degree of freedom calculated of the volume of the cylinder with derived formula less a relevant item about indication error of the micrometer in the denominator in the formula of degrees of freedom than Error Theory and Data Processing (6th Edition) edited by Fei Yetai. After analysis, the indication error of the micrometer is a random error in measuring height and diameter of the cylinder, it is not relevant. Therefore, in calculating the degree of freedom of the cylinder volume uncertainty, the relevant items on indication error of the micrometer should not be introduced to the calculation formula of degree of freedom of uncertainty.
2018 Vol. 39 (6A): 53- [Abstract] ( 481 ) HTML (1 KB)  PDF (301 KB)  ( 847 )
58 A Large-scale and Multi-functional Laser Measuring Machine and Uncertainty Analysis
YAN Jun-fang,YAN Hao,YANG Wei-min,GAO Peng,LIU Xin
DOI: 10.3969/j.issn.1000-1158.2018.z1.12
To improve the range, accuracy and reliability of laser measuring machine, a laser measuring machine of large-scale and multi-functional was developed, which can meet the needs of large-scale, high-accuracy and interchangeability for equipment manufacturing industry. The system adopted granite guide as instrument base, interferometer as measuring datum accorded to Abbe principle in structure which was supported on some aerostatic slides. In addition, the measuring accuracy and stability were improved by means of the technology of temperature compensation.The error which affected laser measuring machines accuracy was analyzed. The results show that, the range of laser measuring machine is (0～26) m, the uncertainty is 0.3μm+0.2×10-6L, k=2.
2018 Vol. 39 (6A): 58- [Abstract] ( 309 ) HTML (1 KB)  PDF (634 KB)  ( 180 )
62 Accuracy Study on the Calibration System of Displacement Sensurs in Vacuum Eviroment
YE Ying-qian,REN Guo-ying,LI Wei-xian,FAN Nai-yin,ZHU Cheng-ji,DONG Yi-fan
DOI: 10.3969/j.issn.1000-1158.2018.z1.13
To introduce the principle of precision displacement sensors calibration system in vacuum environment and accuracy test and verify. All of traditional calibration device and method to precision displacement sensor s are calibrated in the air environment. To keep the sports device in the same displacement, the rigid transmission is used. The measurement in air environment can be got by precision displacement sensor, and the measurement in vacuum environment can be got bysingle-frequency laser interferometer in Michelson optical system. According to JJF 1305—2011,a serious experiment were done to the calibration system, then make a comparative analysis of the error structure and calculate the measurement uncertainty to ensure the accuracy of precision displacement sensor.
2018 Vol. 39 (6A): 62- [Abstract] ( 335 ) HTML (1 KB)  PDF (531 KB)  ( 302 )
66 Calibration Method of Indication Error of Plumb-line Observer and Uncertainty Analysis of Measurement Results
HE Hao-peng,LI Ji,ZHANG Xin,LIU Hai-bo
DOI: 10.3969/j.issn.1000-1158.2018.z1.14
In order to ensure the accuracy and reliability of the monitoring data of the plumb-line observer, the calibration method of the indication error of the plumb-line observer is studied. Selecting the plumb line as a measuring standard for measuring indication error of plumb-line observer,through the controlled by the motion program of image measuring instrument,the plumb line moves on XY coordinate,so that the trajectory vector of the plumb line is equal to the vector produced by the xy coordinate motion of the plumb-line observer, and the xy coordinate indication error of the plumb-line observer is obtained by comparing the modes of the two vectors. The measurement uncertainty is analyzed,and verifies that the calibration method is traceable.This universal method call be taken as an effective calibration to measure the indication error of various types of plumb-line observers.
2018 Vol. 39 (6A): 66- [Abstract] ( 287 ) HTML (1 KB)  PDF (595 KB)  ( 219 )
69 Uncertainty Analysis of Spatial Distance in Spherical Coordinates
HE Ming-zhao,LI Lian-fu,LI Jian-shuang,GAN Xiao-chuan,SONG Jin-cheng,GUO Li-zhen,XU Wei-yi
DOI: 10.3969/j.issn.1000-1158.2018.z1.15
The calculation methods of the spatial distance in the orthogonal coordinate system and the spherical coordinate system are analyzed, and the measurement uncertainty in the spherical coordinate system is derived, and an example of the minimum uncertainty is given. The spherical coordinate system user can quickly evaluates the results and optimizes the measurement layout.
2018 Vol. 39 (6A): 69- [Abstract] ( 265 ) HTML (1 KB)  PDF (718 KB)  ( 199 )
73 Analysis of Errors of 8~14μm Radiation Thermometer Calibrate Equations
MA Yun-xiao,CAI Jing
DOI: 10.3969/j.issn.1000-1158.2018.z1.16
The radiation thermometer is usually calibrated using the interpolation equations. In order to choose the proper calibrate equation of 8~14μm radiation thermometer, MATLAB is used to emulate the calibration process using several usual calibrate equations in 8~14μm and -50~1000℃. According to the emulate results, compared the accuracy of the calibrate equations, and analyzed the influence to the results of choosing calibrate points, finally confirmed the most proper calibrate equation and calibrate points.
2018 Vol. 39 (6A): 73- [Abstract] ( 317 ) HTML (1 KB)  PDF (871 KB)  ( 205 )
78 Discussion on Wireless Temperature Measurement Technology in Aircraft Manufacturing
LIU Xiao-han
DOI: 10.3969/j.issn.1000-1158.2018.z1.17
The metrology has its special position and role in the filed of commercial aircraft manufacturing. The temperature test in the commercial aircraft manufacturing process has been introduced. The application and significance of the wireless temperature measuring technology has been discussed emphatically, and the future development direction is prospected, it could help to improve the temperature test method.The metrology has its special position and role in the filed of commercial aircraft manufacturing. The temperature test in the commercial aircraft manufacturing process has been introduced. The application and significance of the wireless temperature measuring technology has been discussed emphatically, and the future development direction is prospected, it could help to improve the temperature test method.
2018 Vol. 39 (6A): 78- [Abstract] ( 239 ) HTML (1 KB)  PDF (2148 KB)  ( 300 )
84 Thermal Instrumentation and Analysis of 5000t/d Cement Clinker Production Line
XIONG Zhi-ming,HUANG Bo,DING Xiang-ping
DOI: 10.3969/j.issn.1000-1158.2018.z1.18
Through analyzing the measured data of LYNF 5000 t / d cement production line, the line has a practical clinker output of 5587 t / d. The heat consumption of sintering system is 3166.8 kJ/kg. The first stage outlet has got a slightly higher temperature at 321 ℃. The C1 separating efficiency is 92.81%, which can be significantly improved. The poor cooling effect of grate cooler results in the low-quality & high temperature clinker and the heat recovery efficiency isn't ideal. The production potential is great by analyzing the measured data. The heat consumption, electricity consumption and clinker output are saved after production system is improved.
2018 Vol. 39 (6A): 84- [Abstract] ( 327 ) HTML (1 KB)  PDF (311 KB)  ( 367 )
88 Preliminary Study on Influence of Installation Conditions on Measuring Accuracy of Ultrasonic Flowmeters
HAN Wei,CHEN Xing-chuan,ZHANG Huo-jian,WANG Duo-cai,ZHOU Lei
DOI: 10.3969/j.issn.1000-1158.2018.z1.19
The effects of different installation conditions on measuring accuracy of ultrasonic flowmeter were studied by means of experimental test and numerical simulation. The experimental results show that the rusted straight pipe section and whether or not to install flow conditioner and which flow conditioner to install have a great influence on the flow state and measurement results. The numerical simulation results support the experimental results. In order to ensure the accuracy and reliability of the trade handover, the verification and on-site use and installation should meet the standard requirements. If the consistency cannot be achieved, it is suggested to submit the supporting accessories of the flow meter for inspection together.
2018 Vol. 39 (6A): 88- [Abstract] ( 309 ) HTML (1 KB)  PDF (859 KB)  ( 264 )
93 Coriolis Flowmeter with Extra-high Pressure for Hydrogen Dispenser
NAKAO Yuyichi,ZHAO Xi
DOI: 10.3969/j.issn.1000-1158.2018.z1.20
According to the technical specifications of flowmeter in hydrogen dispenser for fuel cell vehicle (FCV), the Coriolis Flowmeter suitable to high pressure gas filling was developed. Taking CA004 flowmeter with resistance to pressure 120 MPa as an example, the developing process and the characteristics of this type of flowmeter were introduced, from aspects such as setting of internal diameter of metering tube, choice of double loop, geometry design of metering tube, verification of various vibration mode of metering tube, structure of laminated tube for connector, material choice of metering tube and its strength calculation. The results of instrument error, pressure and temperature dependence experiments show that, the flowmeter meets the requirement of hydrogen filling with precision ±1%,therefore, it can be used in hydrogen dispenser for flow metering.
2018 Vol. 39 (6A): 93- [Abstract] ( 359 ) HTML (1 KB)  PDF (1139 KB)  ( 386 )
98 Draft On-line Calibration Device of Ultrasound Gas FlowBased on Venturi Double Differential Pressure
WAN Li-fen,SANG Xiao-ming,GAO Zhen-hua,YIN Yan-zhen,HE Cheng
DOI: 10.3969/j.issn.1000-1158.2018.z1.21
An on-line calibration device for large flow aerosol sampler is introduced,Its working principle, measuring method, technical index and function are described.Principle of Venturi double differential pressure ultrasound gas flow measurement, it overcomes the problem of small flow range ratio of single type flowmeter,the range ratio can be extended to 1:40 or even higher,it has the characteristics of high accuracy, small pressure loss, small volume and easy to carry.
2018 Vol. 39 (6A): 98- [Abstract] ( 264 ) HTML (1 KB)  PDF (399 KB)  ( 376 )
101 Investigation on the Calibration Methods of Gas Flow Standard Facilities by Master Method
SONG Jin,LIU Yi-ping,CHEN Chao,LI Hai-yang
DOI: 10.3969/j.issn.1000-1158.2018.z1.22
In view of the problems existing in the calibration of gas flow standard facilities by master method, such as short verification period , complicated removal and installation of master meter, a new method to trace the value of master meter is proposed and by experiments ,the feasibility of this method is verified. Experimental results show that: the meter factor get from the new method is no more than 0.1% different from the traditional method,and the error of the flowmeter calibrated by the flow standard facilities and higher level standard facilities shall not exceed 0.1%.
2018 Vol. 39 (6A): 101- [Abstract] ( 311 ) HTML (1 KB)  PDF (524 KB)  ( 250 )
104 Method for the tractability of Quantity Value of Sonic Nozzles with Stagnation Pressure as Low as 10 kPa
LI Chun-hui,SU Jin-you,YUAN Shi-hui,GAO Shan,ZHOU Li-yuan
DOI: 10.3969/j.issn.1000-1158.2018.z1.23
In order to solve the problem that the existing gas flow measurement calibration technology can not achieve the direct calibration of the air engines gas flow under low pressure operating conditions and the traceability of the quantity value, the method of direct calibration and quantity tracing of sonic nozzles under low stagnation pressure was studied. Firstly, four sonic nozzles with nominal throat diameter of 40 mm were tested under atmospheric pressure using the gas flow reference device of pVTt method. Secondly, based on five standard sonic nozzles, the real flow calibration of sonic nozzles with a minimum of 10 kPa stagnation pressure is achieved by using a series of sonic nozzles. Finally, the discharge coefficient measured is linearly matched with the square root reciprocal of the Reynolds number in the throat of nozzle. Based on the linear fitting results, the feasibility and accuracy of the method are verified.
2018 Vol. 39 (6A): 104- [Abstract] ( 310 ) HTML (1 KB)  PDF (762 KB)  ( 247 )
108 A Measurement Performance Test of Thermal Mass Gas Meter Using Nature Gas with Different Components
WANG Wei,LIAO Xin,LI Xia
DOI: 10.3969/j.issn.1000-1158.2018.z1.24
To make sure the metrological performance of thermal mass gas meters under different component nature gas measurement conditions, an experiment has been designed and six kinds of nature gas with different components have been used as measure media. The measurement results of a roots flow meter is set as the standards, and the measurement results of thermal mass gas meter are compared with the standard results. The experimental data showed that the maximum relative error of the measurement result of the thermal gas meter is reduced to 7% after the gas component identification function is turned on.
2018 Vol. 39 (6A): 108- [Abstract] ( 259 ) HTML (1 KB)  PDF (482 KB)  ( 404 )
111 Application of Uncertainty Assessment Method of Natural Gas Physical Parameters in Flow Measurement Standards
LIU Zhe,SONG Chao-fan,WANG Duo-cai,LI Xue-jian, WANG Xin-liang,YU Hao
DOI: 10.3969/j.issn.1000-1158.2018.z1.25
Through researching the uncertainty evaluation method of natural gas physical properties using in the natural gas flowrate measurement standard,and the uncertainty evaluation method of natural gas component analysis using to calculate those physical properties,derives the uncertainty evaluation method of the natural gas flowrate measurement standard,with GUM method. Using those methods and the testing data of some domestic natural gas flowrate meter calibration station, to evaluate measurement uncertainties of mt primary measurement standard,critical flow venture nozzle secondary measurement standard,turbine meter working measurement standard and their calibrating meters. At the same time, gives the suggestion of the CRMs class using in natural gas component analysis for defferent measurement standard.
2018 Vol. 39 (6A): 111- [Abstract] ( 267 ) HTML (1 KB)  PDF (365 KB)  ( 237 )
116 Simulation of the Wall Correction Factors and Physical Constants of 250~600 kV X-ray Graphite Cavity Ionization Chamber
WANG Bo,WU Jin-jie,DU Hai-yan,REN Shi-wei
DOI: 10.3969/j.issn.1000-1158.2018.z1.26
Graphite cavity ionization chamber due to higher energy has good energy response, is widely used in 137Cs(effective energy of 662keV), 60Co (effective energy of 1250keV) and average energy is 350keV 192Ir gamma ray air kerma.The EGSnrc program was used to simulate the wall correction factor and physical constant of the self-made graphite cavity ionization chamber in the process of quantitative reconstruction under 250~400kV narrow spectrum radiative mass. The results showed that there was a significant relationship between the blocking power ratio of graphite and air, the mass energy absorption coefficient of air and graphite, and the proportion constant of toughened radiation, and the average energy. With the increase of X-ray energy, the wall correction factor had a tendency of first increasing and then decreasing, and it could not determine the future trend. The results of monte carlo simulation provide technical data for establishing 250~600kV X-ray air kerma national benchmark and realizing the reappearance of measurement values, and meet the expected requirements of the uncertainty of measurement of the reappearance results.
2018 Vol. 39 (6A): 116- [Abstract] ( 263 ) HTML (1 KB)  PDF (1038 KB)  ( 177 )
122 Measurement of Air Kerma of Tungsten Target X-ray Tube with Molybdenum Filter
WANG Ji,LI Hong-jie,WU Jin-jie,REN Shi-wei
DOI: 10.3969/j.issn.1000-1158.2018.z1.27
In the low-energy X-ray reference radiation field of China Institute of Metrology, a tungsten target molybdenum filter X-ray radiation with a tube voltage of 23, 25, 28, 30, 35kV was established, and the additional filtration was 0.06mm Mo film. Its half-value layer measurement shows that the half-value layer is maintained at 0.346 to 0.405mm of aluminum. The effective energy is maintained at 15.4 to 16.4keV, which is significantly higher than the molybdenum target X-rays excited by the same tube voltage. The correction factor of the mammography X-ray free air ionization chamber was measured, and the measurement of the air kerma was completed.
2018 Vol. 39 (6A): 122- [Abstract] ( 249 ) HTML (1 KB)  PDF (1277 KB)  ( 310 )
127 Study on 225kV X-ray Tube Voltage, Tube Current and Intrinsic Filtration
LI Meng-shi,WU Jin-jie,GUO Si-ming,LU Xing-qiang
DOI: 10.3969/j.issn.1000-1158.2018.z1.28
The tube voltage, tube current and inherent filtration of the X-ray machine are important parameters for the quality control of the X-ray machine. Measurement of X-ray tube voltage, tube current, and intrinsic filtration is necessary for the performance evaluation of X-ray machines and the establishment of reference radiation. Taking an X-ray machine with a tube voltage upper limit of 225kV as an example, the tube voltage of the X-ray machine is measured by the energy spectrum end point method, and the X-ray machine can display the tube voltage value within the range of ±0.2%; The finger-type ionization chamber PTW30013 measures the linearity of the high-energy X-ray tube current, and the measured tube current performance of the X-ray machine is good; the inherent filtration of the X-ray machine is measured by the half-value layer method, and the intrinsic filtration is 0.058mm Al.
2018 Vol. 39 (6A): 127- [Abstract] ( 357 ) HTML (1 KB)  PDF (1111 KB)  ( 276 )
131 Establishment of Environmental Level X-ray Radiation Qualities and Research of the Calibration Methods of Monitoring Instruments
ZHAO Rui,WU Jin-jie,FAN Song,SUN Sheng-tao,HUANG Jian-wei,ZHANG Jian
DOI: 10.3969/j.issn.1000-1158.2018.z1.29
With the establishment and operation of radiation environment monitoring network, radiation environment automatic monitoring is an important means to ensure nuclear and radiation safety supervision. In order to ensure the accurate measurement of environmental monitoring dosimeters at low dose rate, it is necessary to trace and calibrate its measurement value. A series of low air-kerma radiation qualities were established. The dose-rate was about 25μGy/h. Three different types environment monitoring radiation dosimeters were calibrated in these radiation and the energy response was obtained. The performance differences of these instruments were compared. The radiation field quantities provide the basis in measurement in very low dose rate.
2018 Vol. 39 (6A): 131- [Abstract] ( 294 ) HTML (1 KB)  PDF (1087 KB)  ( 234 )
137 Research of Hard X-ray Detector Ground Calibration Facility
HOU Dong-jie,WU Jin-jie,GUO Si-ming,WU Chong
DOI: 10.3969/j.issn.1000-1158.2018.z1.30
The research of 20.8~301.9keV monochromatic X-rays provides basic guarantee for ground calibration of space-borne detectors. Two sets of hard X-ray detector ground calibration facilities were established. One of them is a double-crystal calibration facility equipped with X-ray tubes with tube voltages of 220kV and 600kV, a set of double-crystal monochromator. And monochromator crystal adopts Si(220) crystal and Si(551) crystal, by means of adjusting Bragg diffraction angles can achieve monochromatic X-rays beam of (20.8~70.1) keV and monochromatic X-rays beam of (46.6~196.5) keV respectively. The other set is a single crystal calibration facility equipped with a 600kV X-ray tube and a single crystal monochromator. Using Si(551) crystal can realize monochromatic X-rays of (33.6~301.9) keV. Two sets of hard X-ray detector ground calibration facilities realized monochromatic X-rays of (20.8~301.9) keV together.The energy resolution of the double crystal calibration facility is 1.80%@23.2keV, 1.19%@70.1keV; the energy resolution of the single crystal calibration facility is 1.53%@92.6keV, 5.55%@301.9keV, it can meet the calibration requirement of Gravitational wave high-energy Electromagnetic Counterpart All-sky Monitor, Space Variable Objects Monitor and Advanced Space-based Solar Observatory.
2018 Vol. 39 (6A): 137- [Abstract] ( 258 ) HTML (1 KB)  PDF (1217 KB)  ( 213 )
143 Design and Monochromaticity of a Monochromatic X-ray Calibration Device
GUO Si-ming,LI Meng-shi,HOU Dong-jie,WU Jin-jie,WANG Ji,WANG Bo,ZHAI Yu-dan,HUANG Jian-wei,ZHANG Jian
DOI: 10.3969/j.issn.1000-1158.2018.z1.31
The monochromatic X-rays produced by crystal Bragg diffraction has the advantage of continuously adjustable energy, and is the preferred solution for X-ray detector calibration. In order to establish a 5~30keV single-energy X-ray radiation device, the Bragg diffraction study of crystal monochromator and grating monochromator is carried out. The position of the single-energy X-ray beam required to be emitted is adjusted when different Bragg angles are adjusted. To accurately perform detection efficiency calibration. The established single-energy X-ray calibration device is mainly composed of an X-ray machine, a diffractive crystal, and a synchronous rotating device, and covers an energy range 5~30keV. Combined with the single-energy X-ray source measurement results, the monochromaticity is calculated, and the energy broadening of the single-energy X-ray source is calculated according to the experimental conditions. The calculation results show that the single-energy X-ray source itself has very good monochromaticity, and its energy broadening is mainly caused by the size of the limiting beam, that is, the incident angle.
2018 Vol. 39 (6A): 143- [Abstract] ( 314 ) HTML (1 KB)  PDF (1134 KB)  ( 313 )
148 Research on Measurement System for Medium-energy X-rays Absorbed Dose to Water
FAN Song,WU Jin-jie,WANG Kun,WANG Zhi-peng,ZHAO Rui
DOI: 10.3969/j.issn.1000-1158.2018.z1.32
Medium-energy X-rays are mainly used for radiation diagnosis of cancer and radiotherapy of deep or superficial tumors. Absorbed dose to water is characterized by the physical quantity that X-rays are deposited in the human body. Three are currently three methods for measuring absorbed dose to water of X-rays, such as calorimetry, ionization and chemical dosing. The hydrothermal method is to determine the dose absorbed to water by measuring the temperature rise caused by the energy deposition of radiation beams in water. In order to measure the medium-energy X-ray water absorption dose, five X-ray radiation matters of (100~220) kV for radiotherapy were established, and the dose absorbed to water under each radiation was directly measured by a cavity cylindrical hydrocalorimeter. The method initially realizes the absolute measurement of the dose absorbed to water for the medium energy X-rays, and provides a basis for establishing the dose absorbed to water of the medium energy X-rays primary or second standard device.
2018 Vol. 39 (6A): 148- [Abstract] ( 293 ) HTML (1 KB)  PDF (1160 KB)  ( 210 )
153 Establishment of 10~70kV X-ray Low Air Kerma Energy Reference Radiation and Energy Spectrum Simulation
SUN Sheng-tao,WU Jin-jie,ZHANG De-liang,FAN Song,ZHAO Rui,WANG Ji
DOI: 10.3969/j.issn.1000-1158.2018.z1.33
In order to more accurately carry out the traceability and magnitude transfer of X-rays at low dose rate levels,six low air ratio kinetic energy X-ray reference radiation were established according to ISO 4037-1.The half-value layer, energy spectrum, average energy and effective energy of the corresponding radiation are obtained through experiments. Compare data with ISO4037 and PTB data, NIST data,The error is within 5%,It indicates that the established X-ray reference radiation quality meets the requirements of the standard specification.Subsequent research on low-dose rate X-ray quantity recurrence and quantity transfer methods will continue, laying the foundation for international and domestic value transfer and comparison work.
2018 Vol. 39 (6A): 153- [Abstract] ( 278 ) HTML (1 KB)  PDF (1260 KB)  ( 199 )
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