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2017 Vol. 38, No. 3 Published: 2017-05-22

	257	The Development of the Phase Stepping Gauge Block Interferometer
		ZHANG Xu-dong,LIU Xiang-bin,WANG Shi-jie, WANG Zhen-hua,WU Yue-yan
		DOI: 10.3969/j.issn.1000-1158.2017.03.01
		A gauge block interferometer for 0.5～100 mm by phase stepping interferometry is described. Two stabilized lasers, 633nm and 543nm, are introduced into the interferometer using a single mode fiber. The interference fringes are taken using a CCD camera and the fractions of the fringes are calculated by five step phase stepping method with mechanical phase shift. The gauge block length is measured by the method of exact fractions. The uncertainty for gauge block measurement reaches to U=0.015 μm+0.07×10^-6L (L is the length of gauge block, mm).
		2017 Vol. 38 (3): 257-261 [Abstract] ( 511 ) HTML (1 KB) PDF (1317 KB) ( 657 )

	262	Research on Double Telecentric Optical System for the Form and Position Detection of Automobile Brake Cylinder Compensation Hole
		GAO Jun-peng,JIANG Tao,ZHANG Gui-lin,LI Hui-ming
		DOI: 10.3969/j.issn.1000-1158.2017.03.02
		A telecentric optical imaging system has been designed to solve the problem of brake master cylinder compensation hole imaging. In the design, industrial endoscope to extend the range of imaging system is adopted. Its back-end is connected with CCD camera which captures the image information of compensation hole through the endoscopic moving back and forth. As endoscopic imaging optical path is designed into an optical path which combines telecentric structure in the image space with telecentric structure in the object space, solving the detection error problem well which the brake master cylinder compensation hole image is caused by suppositional focus, thus improving the detection accuracy of the system. The experimental results show that the detection accuracy is 0.01 mm.
		2017 Vol. 38 (3): 262-266 [Abstract] ( 441 ) HTML (1 KB) PDF (1728 KB) ( 500 )

	267	A Method of Displacement Detection of Mine Hoisting Container
		LI Ruo-mei,TAN Jian-ping,SHI Li-xiang
		DOI: 10.3969/j.issn.1000-1158.2017.03.03
		A kind of displacement monitoring system based on coded cable / encoder is proposed. In this system coded cables lay near the mid-segment of the mine, and two coding cables are connected with multi-core cable. When the mine hoisting container is going to stop, the system can realize high-accuracy detection of displacement of the mine hoisting container. The encoder is used in whole process and the data of the both are referenced to each other. The design of hardware and software systems are introduced. The experimental results show that the displacement monitoring system designed can ensure the displacement detection error of mine hoisting container is less than 6mm while crawling and parking will improve the system reliability and security and create a very good condition for the ultra deep mine mining.
		2017 Vol. 38 (3): 267-270 [Abstract] ( 521 ) HTML (1 KB) PDF (489 KB) ( 478 )

	271	AACMM Length Error Compensation Based on PSO-BP Neural Network
		LU Yi,ZHANG Pei-pei,WANG Xue-ying,WANG Hua,ZHAO Chen-xin
		DOI: 10.3969/j.issn.1000-1158.2017.03.04
		In order to resolve the problem of the length error compensation for articulated arm coordinate measuring machine (AACMM), the error sources were analyzed and the parameters of affecting the measurement length error for AACMM were determined by experiments.The AACMM length error compensation model was built up by BP neural network, and the particle swarm optimization algorithm was introduced to overcome the drawbacks of slow convergence and easily trapping in the local minimum values of BP neural network. For getting the training data of neural network, the standard ruler was measured on different error parameters, and the measurement compensation verification was also carried out. After compensation, the mean error reduced by 0.014mm and the measurement precision of AACMM increased by 31.8%.
		2017 Vol. 38 (3): 271-275 [Abstract] ( 439 ) HTML (1 KB) PDF (1191 KB) ( 615 )

	276	The Development of Axial Standard Device for Calibration of Ophthalmometers
		ZHANG Ji-yan,LI Jiao,GAO Ming-liang,DING Xiang
		DOI: 10.3969/j.issn.1000-1158.2017.03.05
		In order to resolve the axis calibration of ophthalmometers, aixal standard device is developed which consists of axial model eye, axial sleeve and measurement support. Axial model eye is a square cylinder whose front surface is toroidal and back surface is scrub plane, which is located in the square through hole of axial sleeve, and axial sleeve is located on the trapezoid groove of measurement support. By assembly and mechanical positioning,the measurement of four axes of 0°, 45°, 90° and 135° are achieved and axis uncertainty is about 0.5° with coverage factor of 2, which meets the requirement of axis calibration for different kinds of ophthalmometers. Moreover, the developed axial standard device not only expands measurement capabilities of the existing working standard of ophthalmometers, but also provides technical support for revision of related verification regulations.
		2017 Vol. 38 (3): 276-279 [Abstract] ( 696 ) HTML (1 KB) PDF (532 KB) ( 657 )

	280	A Combined Cost Algorithm Based on Adaptive Parameter
		LI Hai-bin,DONG Yu,LI Ya-qian
		DOI: 10.3969/j.issn.1000-1158.2017.03.06
		Due to the limitations of single matching cost algorithm and the bad adaptive of fixed parameter combined method, a new combined cost based on adaptive parameters is presented. Firstly, sum of absolute difference and census algorithm were used to calculate the matching cost for each pixel separately. Secondly, the mean and standard deviation of cost for each pixel within the disparity range were calculated, and then the weight is obtained. Finally, the two algorithms together with the corresponding weight were combined, and then the new cost function is obtained. Experimental results show that the proposed method is better than single algorithm of matching error rate (reduced about 12%). And the cost function combines advantages of different algorithms in weak texture, repetition texture and changing illumination situations.
		2017 Vol. 38 (3): 280-283 [Abstract] ( 724 ) HTML (1 KB) PDF (1115 KB) ( 514 )

	284	Research on Image Retrieval Based on Kernel Density Estimation and Fractal Coding Algorithm
		ZHANG Qin,LIN Qing-hua,KANG Xin
		DOI: 10.3969/j.issn.1000-1158.2017.03.07
		To improve the application value of image retrieval technology based on image fractal coding, aiming at natural images, a robust index (rotation, translation, scaling invariance) extracted from fractal parameters is proposed and that is improved Hu invariant moment. The index is extracted from an approximate image constructed by mean range blocks. Then combines statistic characteristic of fractal parameters with the Hu invariant moment index, the weighed indices are employed to compare the similarities among images. The experimental results show that the weighted indices perform better than a separate index.
		2017 Vol. 38 (3): 284-287 [Abstract] ( 540 ) HTML (1 KB) PDF (362 KB) ( 528 )

	288	Moving Vehicle Detection Based on Computer Vision
		CHENG Shu-hong,GAO Xu,CHENG Shu-chun,GUAN Yong-lai
		DOI: 10.3969/j.issn.1000-1158.2017.03.08
		A moving vehicle detection method was proposed, which is based on computer vision for vehicle detection in video image. First, the best variance parameters were selected and the bilateral filtering is used for image pre-processing. Then the real-time background image is updated with surendra background updating algorithm, using the particle swarm optimization (PSO) maximum entropy method to obtain background subtraction image threshold. Next, the binary image will be handled by morphology processing and the moving vehicles will be detected. Experimental results show that the algorithm is not only suitable for a simple background with slow-speed cars, but in a complex situation with larger noise and fast-speed cars, the proposed method can detect moving vehicles accurately through the adverse effect of the external environment. Hence, the accuracy of detection was improved.
		2017 Vol. 38 (3): 288-291 [Abstract] ( 645 ) HTML (1 KB) PDF (858 KB) ( 869 )

	292	Development and Experimental Study on the Temperature Uniformity of Cu-R134a Heat Pipe Used for Standard Blackbody Source
		DING Lin-chao,YUAN Da-zhong,TANG Da-wei,WEI Ling-jiao,PEI Zhen-hong
		DOI: 10.3969/j.issn.1000-1158.2017.03.09
		As the temperature uniformity of the heat pipe will deteriorate when it is inclined, a Cu-R134a blackbody source heat pipe with advanced structure has been tested to investigate the influence of inclined angle, operating temperature and filling ratio on the temperature uniformity of the heat pipe. The regional temperature standard deviation was proposed as the heat pipe temperature uniformity metrics. It was found that when the inclined angle was less than 45°, the inclined angle have little influence on the uniformity of temperature field. And the temperature uniformity got worse when operating temperature increased. When the operating temperature was between 40 ~ 50 ℃, the temperature uniformity of the heat pipe changed little with the filling ratio.
		2017 Vol. 38 (3): 292-295 [Abstract] ( 649 ) HTML (1 KB) PDF (1857 KB) ( 438 )

	296	Non-Gravimetric Method For Ultra Micro Liquid Volume Measurement
		LI Zhi-hao,WANG Jin-tao,LIU Xiang,CHEN Chao-yun,TONG Lin,BAO Xue-song,ZHANG Long,LIU Zi-yong,ZHANG Pei-man
		DOI: 10.3969/j.issn.1000-1158.2017.03.10
		In order to overcome the shortcoming of significant influence of evaporation capacity on gravimetric method, and meet the requirements of online measurement, one non-gravimetric method was introduced for measuring micro liquid volume. According to Faraday law and Karl Fischer electrochemical principle, the Karl Fischer potentiometric titration method (KFCT method) is also investigated for micro liquid volume measurement, which calculates micro water content by measuring consumed electric quantity in electrolytic process, and obtains the micro liquid volume by combining liquid density. Comparing to gravimetric method, experimental systems for the non-gravimetric method was designed. The experiment indicates that the test result by using KFCT method is in good conformance with that by using gravimetric method, and meet the technical requirement of ISO 8655, but the measured value of KFCT method is a little bigger. Comparing with gravimetric method, which is low in requirement of measurement environment, easy to realize the online calibration and capable of effectively reducing the influence of liquid evaporation.
		2017 Vol. 38 (3): 296-299 [Abstract] ( 806 ) HTML (1 KB) PDF (455 KB) ( 649 )

	300	Dynamic Weighing of Full-size Wood Composite Panels Based on Wavelet Denoising and Empirical Mode Decomposition Algorithm
		WANG Tian-wei,ZHANG Hou-jiang,LU Dun-min,ZHANG Zhi-min
		DOI: 10.3969/j.issn.1000-1158.2017.03.11
		In order to measure the quality of full-size wood composite panels under the condition of vibration, a new dynamic weighing method is proposed based on wavelet denoising and empirical mode decomposition (EMD) .Wavelet denoising is used to preprocess the sampling signal of force sensor and reduce the effects of noise on the EMD. The more reasonable of sifting stopping criteria of intrisical mode function(IMF)and endpoint effect suppression method is put forward to improve the accuracy of dynamic weighing; Using LabVIEW to write dynamic weighing procedures and test, the results show that the proposed method can effectively measure the quality of full-size wood composite panels under the condition of free vibration, and the maximum weighing error is less than 0.4%.
		2017 Vol. 38 (3): 300-303 [Abstract] ( 762 ) HTML (1 KB) PDF (649 KB) ( 469 )

	304	A Static Calibration Method of Micro-electro-mechanical Accelerometer Based on Artifical Fish Swarm Algorithm
		JIN Mei,ZHU Wen-juan,LI Sha-sha,ZHANG Xiu-bei,ZHENG De-zhong
		DOI: 10.3969/j.issn.1000-1158.2017.03.12
		The micro-electro-mechanical systems (MEMS) accelerometer is one of the most important part in inertial motion tracking system, which can be used to obtain the location information movement. In order to exactly location, it is necessary to calibrate its error. According to the sources of the errors and their generation mechanisms, the error model is established.By analyzing the error model, it proposes a method based on AFSA to correct the accelerometer error, and then it will be compared with the six-position testing method. This method can reduce the errors and improve the measurement accuracy of angle in a degree. And the outputs of the micro-electro-mechanical, accelerometer can reflect their true values.
		2017 Vol. 38 (3): 304-308 [Abstract] ( 705 ) HTML (1 KB) PDF (633 KB) ( 495 )

	309	Study and Implementation of Signal Processing Method for Coriolis Mass Flowmeter Based on Hilbert Transform
		ZHANG Jian-guo,XU Ke-jun,DONG Shuai,LIU Zheng,HOU Qi-li
		DOI: 10.3969/j.issn.1000-1158.2017.03.13
		A set of digital signal processing algorithm is designed, which is composed of adaptive lattice filter and Hilbert transform algorithm according to the signal features of Coriolis mass flow sensors. The end effect of Hilbert transform is effectively suppressed by adding window function, and the measurement accuracy is improved. The whole algorithm is implemented in real time on a Coriolis mass flowmeter transmitter developed with TMS320F28335 chip. System tests and water flow calibrations are performed. The maximum relative error is smaller than ±0.1% with the range-ratio up to 10∶1. Experiments results show that the whole algorithm is feasible and effective.
		2017 Vol. 38 (3): 309-314 [Abstract] ( 785 ) HTML (1 KB) PDF (925 KB) ( 781 )

	315	Application of Kalman Filter for Image Reconstruction of Electrical Capacitance Tomography
		ZHANG Li-feng,LI Jia,TIAN Pei
		DOI: 10.3969/j.issn.1000-1158.2017.03.14
		Kalman filter was applied to improve the quality of reconstructed images for electrical capacitance tomography（ECT） by updating the measurement information. The initial values of reconstruction image gray and estimation of the error variance matrix needed to be determined during the process of Kalman filter. To study the influence of initial values on the quality of reconstructed image, three flow patterns were selected for simulation experiments and then the optimal initial values were obtained. At the same time, static tests were carried out using ECT device. Experimental results showed that the reconstructed images which are more close to the real distributions can be obtained based on Kalman filter algorithm using the optimal initial values compared with Landweber algorithm.
		2017 Vol. 38 (3): 315-318 [Abstract] ( 681 ) HTML (1 KB) PDF (1599 KB) ( 442 )

	319	Research on Multi-weights Normalization Method
		HE Shi-jun,ZHANG Ting,HE Hai-yang,CHENG Xiao-long,ZHOU Yuan-yuan
		DOI: 10.3969/j.issn.1000-1158.2017.03.15
		A new multi-weights normalization method based on the parallel normalization model is presented, and it considered the influences of the capacitances when the sensor is full of deference permittivity materials for the measured capacitance. The multi-weights model is suitable for two or more phase flow. The experimental results show that the RMSE of the image reconstruction accuracy based on the multi-weights model is 0.0044, better than that of parallel normalization model which is 0.0322 when more than two kinds of medium in the image reconstruction, so the multi-weights model can improve the image reconstruction accuracy effectively. Through the analysis of the reconstruction image show that it also can improve the sensitivity of the center field and reduce the imaging errors, which greatly improving the quality of reconstruction.
		2017 Vol. 38 (3): 319-323 [Abstract] ( 475 ) HTML (1 KB) PDF (2516 KB) ( 595 )

	324	The Close Loop Standard Facility of High Pressure Gas Flow
		ZHANG Han,LI Chun-hui,CUI Li-shui,CAO Pei-juan
		DOI: 10.3969/j.issn.1000-1158.2017.03.16
		The high pressure close loop gas flow standard facility in National Insititute of Metrology is discribed, which is constructed in 2014. The introduction and uncertainty analysis of the facility was investigated. With 4 sets of turbine meters as the master meters, the maximum flowrate could be 1600m3/h at 2.5MPa for the high pressure close loop working gas flow standard. The expanded uncertainty is 0.21% (k=2). The uncertainty of the facility realization was guaranteed by the calibration of master flowmeters in original position and the pressure measurement method with absolute pressure transmitters plus differential pressure transmitters.
		2017 Vol. 38 (3): 324-327 [Abstract] ( 519 ) HTML (1 KB) PDF (319 KB) ( 772 )

	328	An Online Determination of Natural Frequency for Coriolis Mass Flowmeter Tube
		JIN Yan,WANG Li-jun,HU Liang,XU Chan-na,CUI Xiao-jun,FU Xin
		DOI: 10.3969/j.issn.1000-1158.2017.03.17
		A tube natural frequency online determination is presented based on amplitude of signal characteristic parameters identification for the Coriolis flowmeter(CMF). The transition period of vibration signal that caused by the natural frequency of vibration signal measurement tube changed, is whole period sampled twice. The method obtains the imaginary and real part of parameters containing the sampled signal characteristics through the Fourier transform, and the natural frequency of the measuring tube is calculated according to the calculation model based on the natural frequency of the signal characteristic parameters changing. The proposed method is verified by the experiment, and the method can be used in vibration control of Coriolis flowmeter, helpping the driving frequency quickly and accurately adjusted to the natural frequency, so as to improve the Coriolis mass flowmeter in the complicated and changeable conditions of measurement reliability.
		2017 Vol. 38 (3): 328-332 [Abstract] ( 448 ) HTML (1 KB) PDF (2695 KB) ( 472 )

	333	The Evaluation of Uncertainty of Flow Totalizer Standard Facility
		SHEN Chao,PEI Quan-bin,LIU Bo-tao,XIA Bao-ding,ZOU Wei
		DOI: 10.3969/j.issn.1000-1158.2017.03.18
		According to the JJF 1059《 Evaluation and Expression of Uncertainty in Measurement》, and combining with flow totalizer standard facility,with Daniel S600 + flow totalizer for turbine flowmeter in natural gas metrology as an example, the uncertainty analysis of standard equipment was made with GUM. According to the traceability requirements, the meters whose uncertainty is no better than 0.14% can be calibrated by GUM. In accordance with the traceability requirements, it can verificate /calibrate the flow totalizer which is no better than level 0.5.
		2017 Vol. 38 (3): 333-335 [Abstract] ( 524 ) HTML (1 KB) PDF (273 KB) ( 429 )

	336	Research on Magnetic Performance Consistency of Two Cores of DC Current Comparator
		ZHOU Li-ren,PAN Yang,ZHU Li,QIN Yi,MI Jian-ping,LIN Yan
		DOI: 10.3969/j.issn.1000-1158.2017.03.19
		It was constructed the experiment circuit formed by symmetric square wave voltage source, DC current source, oscilloscope and peak difference demodulation circuit, and it was also provided specific parameters of cores and winding requirement. Pairs of ten winded cores were tested sensitivity and drift value in 10 minutes. The result shows that the pair of cores characterized by the similar physical parameters and same manufacturing processes still has obvious magnetic performance dispersion. The top sensitivity is 7 mV/(μA·T) and the minimum drift value in 10 minutes is 3 μA·T.
		2017 Vol. 38 (3): 336-339 [Abstract] ( 472 ) HTML (1 KB) PDF (1309 KB) ( 488 )

	340	Application of PCA-GRNN in Integrated Meteorological Short-term Load Forecasting
		ZHANG Shu-qing,REN Shuang,JIANG An-qi,HU Yong-tao,ZHANG Hang-fei,QIAO Yong-jing
		DOI: 10.3969/j.issn.1000-1158.2017.03.20
		In order to avoid the shortcomings such as redundancy inputs, long prediction time and low prediction accuracy, which caused by more weather factors and information embedded each other, principal component analysis (PCA) is adopted to extract characteristics of weather factors which are taken as the modeling objects, together with the dates of historical load. Simultaneously, against the shortcoming of BP neural network under dynamic performance, short-term load forecasting model based on generalized regression neural network (GRNN) is established. Comparing with the traditional network model, the forecast to the actual power system load proved that, this method can improve the prediction accuracy and speed significantly and was more practical and effective.
		2017 Vol. 38 (3): 340-344 [Abstract] ( 537 ) HTML (1 KB) PDF (828 KB) ( 573 )

	345	Study on the Detection and Classification of Power Quality Disturbances Using Difference Time-frequency Methods
		ZHANG Li-guo,ZHANG Shu-qing,LI Sha-sha,QIAO Yong-jing,ZHANG Hang-fei,LI Ming-xing,HE Peng
		DOI: 10.3969/j.issn.1000-1158.2017.03.21
		EEMD,LMD,ITD are new time-frequency decomposition methods appear after EMD,which can apply to diagnose complex fault signal. The algorithm、characteristics and procedure of each methods are introduced firstly, then obtain the best suitable decomposition method to every power quality disturbance through the analysis of experiment effects. EEMD is suitable for power amplitude disturbances such as swells, sags, outages decomposition. EEMD and ITD methods are all suitable for impulsive transients but ITD is more quickly and more accurate positioning. ITD is suitable for oscillatory transients. The decomposition effect of voltage flicker using EEMD is better than others and ITD is suitable for the harmonic disturbance decomposition.
		2017 Vol. 38 (3): 345-350 [Abstract] ( 411 ) HTML (1 KB) PDF (3870 KB) ( 640 )

	351	Uncertainty Evaluation of IIR Filtering Based on State-space Model
		HU Hong-bo,SUN Qiao
		DOI: 10.3969/j.issn.1000-1158.2017.03.22
		To solve the problem of uncertainty evaluation for IIR filter calculation in line with GUM, a state-space representation for the filter is used. As a result the output of the filter depends only on the current input and the current state-space vector, the dependence on past inputs and past outputs, which causes unable to evaluation uncertainty under GUM framework, is absorbed in the state-space vector, and the uncertainty calculation formula is given. The proposed method applies iterative computation and thus can be realized in an easy way, and also enables real-time applications. The proposed procedure is illustrated by simulation, for instance, a noise-corrupted signal and a IIR filter with coefficients are uncertain.
		2017 Vol. 38 (3): 351-355 [Abstract] ( 595 ) HTML (1 KB) PDF (7110 KB) ( 288 )

	356	Adaptive Iterative Search Based on Centroid Localization Algorithm for Three-dimensional Space
		ZHENG De-zhong,LI Xue,YUAN Peng,TAN Hong-ying
		DOI: 10.3969/j.issn.1000-1158.2017.03.23
		The adaptive iterative search based on centroid localization algorithm is proposed based on the analysis of cancroids localization algorithm and received signal strength indicator model. First, the initial search step of unknown nodes is figured out, through multiple iterations, updating the search points and search step, the accurate location of nodes is got. This proposed algorithm has better ability of self-adaptive which can improve the accuracy of locating node, automatically adjust the range of search step, and have small number of times to iterate. The influence of different communication radius and density of distribution of reference nodes on location error was analyzed. The results show that the new approach performs well with high location accuracy and strong stability, and it is suitable for localization in three-dimensional space of wireless sensor network.
		2017 Vol. 38 (3): 356-361 [Abstract] ( 568 ) HTML (1 KB) PDF (1784 KB) ( 535 )

	362	Study on the Calibration Techniques for Relative Path Delay of MIMO Channel
		ZHAO Hai-ning,HOU Li-xin,BIAN Xin,ZHOU Xin,LIU Ke
		DOI: 10.3969/j.issn.1000-1158.2017.03.24
		The calibration equipment of MIMO channel path parameter is made up of modular instruments, and using channel estimation techniques, the frequency response of MIMO channel is measured. Then the program that calculate the relative path delay is designed in order that the quantity of path parameter of MIMO channel simulator is calibrated. The calibration system is traceable by using the standard network which is made of delay line. According to experiment results, the range of measuring relative path delay is up to 5 000 ns. At 500 MHz frequency point, indicating value error of relative path delay is not more than 56 ns delay resolution from 291 ns to 585 ns.
		2017 Vol. 38 (3): 362-366 [Abstract] ( 648 ) HTML (1 KB) PDF (1207 KB) ( 530 )

	367	Utilization of Results for Interlaboratory Comparison Analysis of Natural Radionuclides in Uranium Geology Samples
		WANG Tie-jian,GUO Dong-fa,LI Zhen-tao,ZHU Ming-yan,HUANG Qiu-hong,TAN Jing,XIE Sheng-kai,XIA Chen-guang,HU Xiao-hua
		DOI: 10.3969/j.issn.1000-1158.2017.03.25
		Eight uranium geological samples named ALBRIUG-1～ALBRIUG-8 have been prepared using expired archive samples as raw material, through proportioning, grinding, particle size examination and homogeneity testing. Through interlaboratory comparison, it has been determined that the specific activities of gross α, gross β,238U,232Th, 226Ra ,210Po and 40K in uranium geology samples prepared by the laboratory using physical and chemical analytical methods. The homogeneity testing by ICP-MS with minimum sample weighing (50mg) shows that two samples named ALBRIUG-1 and ALBRIUG-8 are in homogeneity, in line with the requirements of reference materials, while the remaining six samples ALBRIUG-2～ALBRIUG-7 are not in homogeneity accordingly.The two samples can be used as quality control samples for analysis of natural radionuclides in uranium geology samples. The radionuclides in the sample ALBRIUG-2 to ALBRIUG-7 are basically in a state of equilibrium, the uranium-radium equilibrium coefficient are from 0.988 to 1.079. They may be used as quality control when using physical analysis with sampling volume larger than 150g.
		2017 Vol. 38 (3): 367-379 [Abstract] ( 408 ) HTML (1 KB) PDF (1113 KB) ( 492 )

	372	Energy Calibration and Detection Efficiency Simulation of CdTe Detector
		YAO Xin-bo,WU Jin-jie,WANG Yu-long,CHEN Cheng,WANG Jia,YANG Yang
		DOI: 10.3969/j.issn.1000-1158.2017.03.26
		CdTe detector need to be scaled before it detects the single parallel photon source. Based on the energy calibration graph and energy resolution by standard point source, accurate internal structure by CT scanning and the results of physical model calculated by MCNP5 Monte Carlo code can be achived. The detector efficiency graph can be obtained on 1keV step from 20keV to 150keV energy range. The detection efficiency is very well at lower energy range and becomes decline at the energy of 27keV and 32keV due to outcome of X-ray escape summits. Then the detector efficiency increases and then decreases with the growth of energy.
		2017 Vol. 38 (3): 372-375 [Abstract] ( 707 ) HTML (1 KB) PDF (545 KB) ( 833 )

	376	Value Expression and Uncertainty Evaluation of Relative Intensity Calibration Reference Material for Raman Spectroscopy
		YAO Ya-xuan,REN Ling-ling,GAO Si-tian,GAO Hui-fang
		DOI: 10.3969/j.issn.1000-1158.2017.03.27
		Raman spectroscopy is commonly used for molecular structure determination and qualitative and quantitative analysis. However, Raman spectra are rarely corrected for variations in spectrometer, which often leads to severe distortions in relative peak intensities, resulting in lack of comparability of Raman spectra between different instruments. Relative intensity calibration reference material and standard equipment of laser confocal microscopy Raman spectrometer is used, and homogeneity and stability of the reference material are examined. The results indicated that the standard reference material is homogeneous and the stated values are valid for one year, moreover, the correction curve of prepared reference material is consistent with that of NIST SRM2243.
		2017 Vol. 38 (3): 376-379 [Abstract] ( 503 ) HTML (1 KB) PDF (616 KB) ( 935 )

	380	On the Relationship Between Measurement Uncertainty and Error Theory
		FAN Qiao-cheng,KUANG Rong,XING Cheng-gang,MA Jun,SHAN Hong-hong,LIN Yu
		DOI: 10.3969/j.issn.1000-1158.2017.03.28
		The power measurement is taken for example to evaluate the measurement result with classical error theory and GUM.The relation of measurement uncertainty to error theory is indicated —measurement uncertainty evaluation takes the place of the handling of random error and uncertain systematic error in classical error theory, this becomes a section of error theory, and is the development and improvement of the concerning part of error theory. This will lead to reasonable and unified in evaluation methods and means of expression.
		2017 Vol. 38 (3): 380-384 [Abstract] ( 529 ) HTML (1 KB) PDF (339 KB) ( 944 )

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