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2013 Vol. 34, No. 5
Published: 2013-09-22
 
401 The Parameters Design and Analysis of Micro-nano CMM Probe
CHEN He, CHEN Xiao-huai, WANG Shan, YANG Qiao, LI Rui-jun
DOI: 10.3969/j.issn.1000-1158.2013.05.01
A high precision contact scanning probe is designed and four different elastic mechanism schemes were proposed. According to the requirements of measuring range, sensitive, stability and stiffness equation in every direction,  optimal structures were selected. For the selected structure, the parameters design, mechanical analysis and finite element analysis were done. The analysis results show that measuring range can meet the requirement of 40 μm×40 μm×20 μm and measuring stiffness is less than 0.5 mN/μm, stiffness equation can meet the requirement .
2013 Vol. 34 (5): 401-405 [Abstract] ( 618 ) HTML (1 KB)  PDF (4651 KB)  ( 942 )
406 Development of Angle Calibration Device for Indoor GPS Transmitters
Development of Angle Calibration Device for Indoor GPS Transmitters
DOI: 10.3969/j.issn.1000-1158.2013.05.02
Indoor GPS (iGPS) is a newly developed laser based measuring system for large scale measurement. Since the synthesis uncertainties of the indoor GPS system provided by a triangulation network propagate from the uncertainties in the individual angular measurements,  the first step in assessing the accuracy of the system is to determine the uncertainties of the horizontal angle and vertical angle. According to the indoor GPS measurement principle and the requirements of the indoor GPS angle calibration technology,combined with precision turntable, laser coaxial adjustment device and the vertical axis, the calibration device is developed. Measuring angle precision are calculated and analyzed. Experiments are then carried out to determine the actual uncertainty of the horizontal and vertical angle. Results show that horizontal angle measurement uncertainty is 1.5″, vertical angle measurement uncertainty is 0.9″, which satisfy the technical index.
2013 Vol. 34 (5): 406-409 [Abstract] ( 638 ) HTML (1 KB)  PDF (3993 KB)  ( 893 )
410 Research and Analysis of Statistical Quality Indexes of a Component Lot for Assuring Predetermined Process Quality
ZHENG Peng, ZHANG Lin-na, ZHAO Feng-xia
DOI: 10.3969/j.issn.1000-1158.2013.05.03
In order to effectively resolve the concurrent design among multiple quality indexes, statistical tolerance and quality statistical parameter, the quality-oriented statistical indexes of a component lot are studied and established on the basis of statistical tolerance theory and statistical process control technology. The statistical quality indexes are analyzed and verified by the computer simulation and the practical experiment, and the experiment results show the theoretical validity and practical feasibility of the quality indexes.
2013 Vol. 34 (5): 410-414 [Abstract] ( 483 ) HTML (1 KB)  PDF (4473 KB)  ( 889 )
415 Study on Multi-function Testing System of Solar Radiation Measuring Meter
SU Shi, ZHANG Guo-yu, AN Zhi-yong, LV Wen-hua, HE Xiao-lei, YANG Yun
DOI: 10.3969/j.issn.1000-1158.2013.05.04
Based on the actual needs of quality assessment of solar radiation measuring instrument, a new kind of multi-function test system which consists of solar simulator and versatile detection platform is proposed. In this research, a solar simulator is used to provide a stable and uniform radiation source, and versatile detection platform is used to meet the function of attitude control for the solar radiation meter. The results show that the solar simulator satisfies the 3A rank of AM1.5 standard, and can be used to test the cosine, direction response error, oblique error, nonlinear error and sensitivity of the radiation meter.
2013 Vol. 34 (5): 415-419 [Abstract] ( 585 ) HTML (1 KB)  PDF (435 KB)  ( 786 )
420 Modeling and Calibration for Multicolor Pseudo-random Encoded Flashlight Projector
LIAO Su-yin, WU Xian-liang, WEI Min, LI Gui-hua, ZHANG Mei
DOI: 10.3969/j.issn.1000-1158.2013.05.05
To realize the 3D Euclidean reconstruction expecielly for dynamic 3D sciene based on single image,active vision technique , multicolor pseudo-random encoded flash projection system need to be modeled  precalibrated. When the system parameters change, using pseudo random coding patterns of geometric constrains can realize the adaptive reconstruction of 3D scene without recalibration. A linear model is used for projector imaging process modeling based on the projector image quality without abnormal denaturation analysis. A high precision direct calibration method  is presented for the projection system by measuring three-dimensional homogeneous coordinates of each projection coding feature points on the target to pre calibrate the internal and external parameters.Calibration accuracy is 0.1 cell. Euclidean reconstruction results is ideal.
2013 Vol. 34 (5): 420-424 [Abstract] ( 620 ) HTML (1 KB)  PDF (1698 KB)  ( 948 )
425 Study on Digit Recognition for Digital Meter Based on Machine Vision
LIU Ke, HOU Li-xin, BIAN Xin
DOI: 10.3969/j.issn.1000-1158.2013.05.06
A digit recognition method based on machine vision is provided for the frequently-used 7-segment LED digital meter. First, images of the meter display value were acquired real-timely by computer-controlled camera. Then the pre-processes of images were done including selection of region of interest and image binarization. Digit images segmentation and coding were further done by projection transformation and then the displayed values of the meter were obtained automatically. Results show that the digit recognition algorithm has great robustness and could meet long period and large amount of data reading and recording.
2013 Vol. 34 (5): 425-429 [Abstract] ( 573 ) HTML (1 KB)  PDF (1179 KB)  ( 1527 )
430 Research on the Construction and Reproducibility of the Co-C HTFP for Thermocouple Calibration
ZHENG Wei, LIANG Xing-zhong, WU Jian
DOI: 10.3969/j.issn.1000-1158.2013.05.07
The method of construction of Co-C high temperature fixed point for thermometer calibration and the testing results of reproducibility with thermocouple at National Institute of Metrology of China are introduced.The experimental data show that the reproducibility of melting point of Co-C cell is 0.03 ℃ using Pt/Pt thermocouple, and the cell is robust after 110 melting and freezing cycles with 500 h above 1300 ℃.
2013 Vol. 34 (5): 430-434 [Abstract] ( 497 ) HTML (1 KB)  PDF (1029 KB)  ( 961 )
435 Development of Anti-vibration-type Vortex Flowmeter with Low Power and Digital Processing
XU Ke-jun, FANG Min, LUO Qing-lin, WANG Gang, KANG Yi-bo, SHI Lei
DOI: 10.3969/j.issn.1000-1158.2013.05.08
An algorithm combing frequency-domain substation with frequency-variance calculation is proposed for the vortex flowmeter with two sensors. A signal processing system is developed with super-low power MCU, and a good experimental results are obtained. This type of flowmeter can measure the frequency of the flow-rate accurately even if the power of vortex flow signal is less than that of vibration noise, and can work in the mode of low-power and two-wire.
2013 Vol. 34 (5): 435-440 [Abstract] ( 549 ) HTML (1 KB)  PDF (990 KB)  ( 918 )
441 A Subsection Correction Method for the Measurement Characteristic of Single Path Ultrasonic Water Meter
YAO Ling, WANG Rang-ding, ZUO Fu-qiang, LUO Yong
DOI: 10.3969/j.issn.1000-1158.2013.05.09
As the fluid in pipe is in different Reynolds number, the average fluid velocity along the acoustic path measured by the ultrasonic water meter and the mean axial fluid velocity has significant nonlinear. Accorded to the different distribution state of measured fluid flow in the pipe, a new segmented correction method of flow measurement characteristics is proposed. By establishing a cutting point in critical area, the correction method of constant coefficient is adopted at the laminar, and that of linear equation fitting is used at the turbulence and transition flow respectively. Experiments show that this method is feasible.
2013 Vol. 34 (5): 441-445 [Abstract] ( 609 ) HTML (1 KB)  PDF (2069 KB)  ( 1045 )
446 Signal Processing for Coriolis Mass FlowmeterBased on Hilbert Transform
LIU Wei-lai, ZHAO Lu, WANG Ke-yi, FENG Zhi-hua, LONG Qian
DOI: 10.3969/j.issn.1000-1158.2013.05.10
In order to process the time-varying output signals of Coriolis mass flowmeter, the method based on Hilbert transform is adopted and investigated. Polyphase decimation filter and band-pass filter are applied to filter out noise respectively, then the original signal is combined with the output of its Hilbert transform to build the analytic signals. By co-conjugate multiplying them the phase difference is calculated, and the fluid mass flow measurement is implemented. A variety of methods are summarized and optimized to realize the Hilbert transform,while simulations are carried out for comparing them. The simulation and experimental results show that the method gets a good real-time performance and meets the measurement requirements.
2013 Vol. 34 (5): 446-451 [Abstract] ( 633 ) HTML (1 KB)  PDF (595 KB)  ( 1311 )
446 New Method on Estimation of Sound Pressure Level Based the Inverse Law  in Anechoic Room Calibration
PU Zhi-qiang, SUN Lei, E Zhi-qun
DOI: 10.3969/j.issn.1000-1158.2013.05.14
The performance of an anechoic room is assessed by comparing the spatial decrease of sound pressure emitted from a test source with the decrease of sound pressure with distance from the source according the inverse square law that would occur in true anechoic. Adopting by reference of ISO 3745, JJF 1147-2006 calibration specification for acoustic performance of anechoic rooms and hemi-anechoic rooms, it was found that some defects on its proposed estimation method on determining sound pressure level based the inverse law and causes some unreasonable measurement results. The reasons and proposed a new estimation method by mathematic deduction are analyzed.
2013 Vol. 34 (5): 446-448 [Abstract] ( 566 ) HTML (1 KB)  PDF (1314 KB)  ( 997 )
452 Design of the Micro-friction Testing System
XU Ying, YU Hua-dong, YU Zhan-jiang, LI Yi-quan
DOI: 10.3969/j.issn.1000-1158.2013.05.11
The law of micro-friction in meso-scale is studied. One optical testing method of micro friction based on the structure of parallel cantilever is given and the testing system is designed, the composition of test system, testing method, the design of force sensor , the testing method and the calibration of force sensor are introduced. The force sensor is calibrated and the deformation of sensor is measured by light reflection. Then the micro friction is obtained by analyzing data. The results of the experiment show the resolution of specification of micro friction testing is 10 μN, which could meet the demands of micro friction testing with short stroke and high resolution and realize the precise test of micro friction. And at the same time it has been analysed which load is unstable during testing.
2013 Vol. 34 (5): 452-456 [Abstract] ( 488 ) HTML (1 KB)  PDF (2271 KB)  ( 879 )
457 Study on Acoustic Volumeter System of Weights
WANG Xiao-lei, WANG Jian, ZHONG Rui-lin, ZHANG Yue, CAI Chang-qing,YAO Hong, DING Jing-an
DOI: 10.3969/j.issn.1000-1158.2013.05.12
To meet the measurement demand of the volume of weights for high accuracy measuring weights, an acoustic volumeter system of weights is developed by using acoustic theory. A practical procedure of measuring the volume of weights ranging from 10 g to 100 g using an acoustic volumeter is proposed. The volumes obtained using an acoustic volumeter were compared with the results obtained by the hydrostatic, and the relative error lower than 8.3×10-4 s acquired. The relative expanded uncertainty of system is lower than 4.3×10-4.
2013 Vol. 34 (5): 457-460 [Abstract] ( 608 ) HTML (1 KB)  PDF (305 KB)  ( 998 )
461 The Impact to the Low-frequency Reciprocity Calibration Caused by Heat Conduction and Sound Leakage in the Coupler
QIU Jian-min1, HE Long-biao2, XU Huan2, ZHONG Bo2, NIU Feng2
DOI: 10.3969/j.issn.1000-1158.2013.05.13
The effect of heat conduction and sound leakage in the coupler on the low-frequency reciprocity calibration was discussed. The theoretical calculations and the experiments with different lengths of the couplers were implemented to find the rules. First  by the principle of the reciprocity calibration and the frequency response characteristics of the condenser microphones in low frequency was described. The sound pressure sensitivity gradually increased as the frequency decreased, and the heat conduction correction factor in the coupled system by the excited microphone - coupler - received microphone become smaller when the lengths of the couplers turned to longer, and the uncertainty components become smaller . Different lengths of the couplers were used to study the impaction of the sound leakage and the optimization program was explored. The experimental results showed that, with 10mm and 15mm couplers the leakage had smaller impaction and the sensitivity had high reproducibility. At the same time, the experimental results conformed the low frequency response characteristics of the condenser microphones in low frequencies.
2013 Vol. 34 (5): 461-465 [Abstract] ( 535 ) HTML (1 KB)  PDF (1281 KB)  ( 1070 )
469 Design of Artificial Intelligent Ultrasonic Heat Meter System with Ultra-low Power Consumption
LI Wei
DOI: 10.3969/j.issn.1000-1158.2013.05.15
An ultrasonic heat meter system which is based on the TDC-GP2 is given a particular introduction.It is a kind of domestic ultrasonic flow meter that combines the flow measurement and the temperature measurement together. The measurement principles for heat,flow rate and temperature are described.Moreover,the method of heat meter design is introduced in detail.Ultrasonic flow measurement technology provides a non-intrusive method to measure flow rate, and also has some outstanding advantages,such as low pressure drop,low energy consumption and high measurement precision.Comparing to the classical mechanical heat meters,it overcomes defects in measurement precision.In addition,it is hard on damage.More importantly, the stop mode of microcontroller is used to lower the power consumption, and the ultrasonic processing circuit is powered only when measuring.
2013 Vol. 34 (5): 469-473 [Abstract] ( 467 ) HTML (1 KB)  PDF (3706 KB)  ( 1024 )
474 The Influence of SNR of Waveforms to Sinusoidal Curve-fit in Partial Period
LIANG Zhi-guo, WU Teng-fei, ZHANG Da-peng, ZHU Zhen-yu
DOI: 10.3969/j.issn.1000-1158.2013.05.16
Aiming at the partial period sinusoidal waveform sampling series, the definition of signal to noise ratio of sampling series (SNR) and the noise to signal ratio of sampling series (NSR) are put forward. By using the method of varying known parameters of partial period of sinusoidal waveforms and the Gauss noise level, when the width of period, phase, and SNR are varied, the varying rules of curve-fitting error of partial period sinusoidal are studied by experiments. The results show that, in partial period sinusoidal curve-fitting, the varying rule between NSR and phase of sinusoidal series is fixed, all the curve-fitting errors of amplitude, frequency, phase, and DC bias vary as NSR. The partial period sinusoidal curve-fitting errors can be estimated by using simulation with curve-fitting parameters. In experiment, the validity and feasibility of the method above are proved.
2013 Vol. 34 (5): 474-479 [Abstract] ( 602 ) HTML (1 KB)  PDF (2426 KB)  ( 1034 )
480 New Method of Weak Periodic Signal Frequency DetectionBased on a Deformable Lorenz System
MENG Ling-ling, SONG Yan-jun, WANG Xiao-dong
DOI: 10.3969/j.issn.1000-1158.2013.05.17
A deformable Lorenz chaos detection system is proposed.The system has two kinds of states,chaotic state and class periodic state.Approximate periodic solutions of the systems is deduced from the average method.Deformable Lorenz system and state feedback control are used together to detect the frequency of weak signal.Deformable Lorenz system is controlled to critical state from chaotic state to class periodic state.The method of spectrum analysis is used to measure the frequency of the detected signal.Simulation experiment shows this method has higher detection precision.Finally,the frequencies to different frequency weak sine signals and non-sine signals are detected,the results show that the system is feasible and effective.
2013 Vol. 34 (5): 480-485 [Abstract] ( 418 ) HTML (1 KB)  PDF (1039 KB)  ( 807 )
486 Application of WOLA Filterbanks in Wideband Digital IF Processing
GUO Lian-ping, TIAN Shu-lin, WANG Zhi-gang, LUO Jun-yi
DOI: 10.3969/j.issn.1000-1158.2013.05.18
The channelized technology is applied to the process and analysis of wideband signals in the digital intermediate frequency (IF) processing module.Polyphase discrete Fourier transform (PDFT) filterbank is an efficient structure for channelized design,but its flexibility is limited by the fixed relationship between decimating factor and channel number. Weighted overlap-add (WOLA) filterbanks is adopted to realized the channelized design in digital IF module.The WOLA structure gets rid of the fixed relationship in PDFT structure and realizes the same functions.The simulation results show the effectiveness of the WOLA structure.
2013 Vol. 34 (5): 486-490 [Abstract] ( 771 ) HTML (1 KB)  PDF (1925 KB)  ( 1346 )
491 Extension and Window Function Based Improve Method for End Effects of Hilbert-Huang Transform
SHI Pei-ming, LI Geng, HAN Dong-ying, LIU Bin
DOI: 10.3969/j.issn.1000-1158.2013.05.19
To overcome the end effects of Hilbert-Huang transform, on the basis of existing method to solve the problem, an extension and window function improve method for end effects was proposed.Through the first to signal with similar extreme a extension and then processing by cosine window function,the inaccuracy of extension and original signal changed because of window function are solved.In a certain degree,the end effects of EMD is overcome,getting more the IMF,meanwhile,through the Hilbert transformation get more accurate boundary spectrum and Hilbert spectrum.It is used in the simulation signal and the cracked rotor fault signal analysis proves that the method has a good effect.
2013 Vol. 34 (5): 491-496 [Abstract] ( 707 ) HTML (1 KB)  PDF (2193 KB)  ( 1370 )
497 Parameter Estimation and Noise Filter in Chaotic Measurement
CHEN Zhong-yong, CHEN Zhuo, ZHANG Hong
DOI: 10.3969/j.issn.1000-1158.2013.05.20
The way of improving parameter chaotic measurement precision with symbolic analysis is studied.A new circle map circuit is used in the system,according to symbolic dynamics,the rule of symbol partition and the symbol acquiring method only by logic judge is presented,and the distance formula of symbol sequence space is also defined.Firstly,fasten initial method is applied,and then Markov symbolic state transfer probability optimization is used to estimate measuring parameters more accurately.Simulation experiment for frequency measurement of base voltage is done.The results show that the method is effective in restraining noise and improving precision.
2013 Vol. 34 (5): 497-501 [Abstract] ( 535 ) HTML (1 KB)  PDF (1774 KB)  ( 1012 )
502 Certified Reference Material of Calorific Value of Isooctane
WANG Hai-feng, LI Jia, SUN Guo-hua, MA Kang, FU Kun, LIU Jun-feng
DOI: 10.3969/j.issn.1000-1158.2013.05.21
The certified reference material (CRM) of calorific value of isooctane is determined by the national standard of calorific value of solid fuels, an isothermal oxygen bomb calorimeter calibrated by the electric energy.The calorific value of the isooctane CRM traces to international system units including temperature, electric current, time and mass via the calibration of electric energy.The systematic errors of mass measurements and uncompleted combustion due to the volatilization of isooctane are avoided by the home-made capsule of polyethylene for the liquid sample.The gross heat of combustion of the isooctane CRM at the standard condition is 47777 J/g with an expanded uncertainty of 52 J/g (the expanded factor k=2).
2013 Vol. 34 (5): 502-507 [Abstract] ( 651 ) HTML (1 KB)  PDF (652 KB)  ( 1079 )
508 Determine the Content of Nucleic Bases Cytosine and Adenine by Electrode Potential Titration in Non-aqueous Solvent
ZHANG Ling, LIU Fang-fang, CHEN Da-zhou, WANG Jing
DOI: 10.3969/j.issn.1000-1158.2013.05.22
A method to determine the content of nucleic bases Cytosine (Cyt) and Adenine (Ade) by electrode potential titration in non-aqueous soolvent is established.The factors affecting the experiments, such as non-aqueous solvent, titrant, the concentration of titrant, and end point of the titration are determined.The optimal experiment conditions determined are glacial acetic acid (HAc) as the non-aqueous solvent,perchloric acid as titrant (HClO4),titrant concentration 0.05 mol/L,and equivalence point of the electrode potential titration curve as endpoint.Through 15 times measurements and uncertainty evaluation, the purity of Ade is 99.40% ±0.38% (k=2), Cyt 99.58%±0.42% (k=2).
2013 Vol. 34 (5): 508-512 [Abstract] ( 518 ) HTML (1 KB)  PDF (388 KB)  ( 1242 )
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