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2023 Vol. 44, No. 2 Published: 2023-02-28

	157	Optimization the Position of the Laser Tracker Based on the Minimum PDOP
		MA Shou-dong,GAO Dong,LU Yong
		DOI: 10.3969/j.issn.1000-1158.2023.02.01
		When using industrial robots to process large components, accurately measuring the relative position relationship between the robot and the large components is the key to ensuring the quality of the processing. In order to improve the measurement accuracy, the position error of the laser tracker is fully considered when a single laser tracker is used for measurement in sequence with multiple stations, and the position optimization study of the laser tracker is carried out. First, the main sources of measurement errors of the laser tracker are discussed, and the principle of sequential multi-station measurement is analyzed. Then, based on the method of minimum position precision attenuation factor (PDOP), the laser tracker station is optimized, and the algorithm for solving the optimal measurement accuracy of each station position is given. Finally, the verification experiment before and after the station optimization are carried out. The results show that the measurement accuracy of the measurement system can be improved by more than 50% after the station optimization, which verifies the effectiveness of the station optimization method.
		2023 Vol. 44 (2): 157-164 [Abstract] ( 194 ) HTML (1 KB) PDF (4038 KB) ( 179 )

	165	Research on Measurement of Geometric Parameters of Optical Fiber Endface Based on Machine Vision
		JIN Ke,CHEN Xiao-rong
		DOI: 10.3969/j.issn.1000-1158.2023.02.02
		A measurement method of optical fiber geometric parameters based on machine vision is studied. This method uses digital image processing algorithm. First, read the image of fiber end face and use Deriche edge detection algorithm to segment the image. Then, the effective edges are extracted and merged by using the algorithm of removing false edges. Finally, the geometric parameters of fiber end face are measured by curve fitting. The experimental results show that the method is simple to operate, low algorithm complexity, high fitting accuracy of optical fiber endface edge, fast data detection speed, and can accurately and efficiently detect the geometric parameters of optical fiber end face. The repeated measurement accuracy of coating layer diameter can reach 0.021 μm, and the repeated measurement accuracy of coating layer out of roundness can reach 0.043%.
		2023 Vol. 44 (2): 165-170 [Abstract] ( 208 ) HTML (1 KB) PDF (1832 KB) ( 671 )

	171	3D Reconstruction of Blade Surface Based on Laser Point Cloud Data
		SONG Jun-fang,SUN Bin,PU Yuan-yuan,XU Xiao-yu,WANG Teng-jiao
		DOI: 10.3969/j.issn.1000-1158.2023.02.03
		Based on the four-coordinate blade surface detection, a 3D reconstruction method of aeroengine blade surface based on laser point cloud data is proposed. The laser displacement sensor scans and samples the blade surface from multiple perspectives, and quickly collects massive point cloud data of the blade surface. Using the mathematical modeling principle from point to line to surface, firstly fit the smooth NURBS curve based on the first-order guide vector continuity method at the end point, then construct the auxiliary plane to fit the NURBS surface according to the sliced energy method, and finally describe the sliced NURBS surface uniformly, construct an accurate and smooth blade profile, and realize the three-dimensional reconstruction of the blade profile. The experimental results show that this method can realize the three-dimensional reconstruction of various blade profiles well, and the reconstruction error is less than 0.015 mm, which can meet the measurement requirements of precision parts perfectly.
		2023 Vol. 44 (2): 171-177 [Abstract] ( 162 ) HTML (1 KB) PDF (2282 KB) ( 705 )

	178	Fabric Defect Detection Based on Deformable Dense Convolutional Neural Network
		ZHUANG Ji-chao,GUO Bao-su,WU Feng-he
		DOI: 10.3969/j.issn.1000-1158.2023.02.04
		A deformable dense convolutional neural network is proposed for the traditional fabric defect detection method which cannot be applied to defect features with large-scale changes and small area ratios. To pay more attention to the feature information that is far away in the image and avoid capturing the texture information, deformable convolution is employed to enhance the semantic expression of the feature. By setting the respective direction x and y offsets of the convolution pixels relative to the center pixel in the convolution layer, and using backpropagation training offsets to increase the deformation adaptability of the receptive field. Meanwhile, a dense connection manner is utilized to keep the model from missing edge defect information. Finally, the classification and location detection of defects is realized based on the defect prediction and the border regression. Experimental results show that the average accuracy of the proposed approach and the standard deviation of single-type target detection accuracy is 93.53% and 2.5139, respectively, compared with other methods, it is more competitive.
		2023 Vol. 44 (2): 178-185 [Abstract] ( 167 ) HTML (1 KB) PDF (4679 KB) ( 270 )

	186	Review of Laser Frequency Stabilization Technology in Atmospheric Detection Lidar
		HUANG Cong,ZHANG Sheng-zi,WANG Jiang,CHANG Jian-hua
		DOI: 10.3969/j.issn.1000-1158.2023.02.05
		Atmospheric detection lidar is widely used in research fields such as atmospheric detection, environmental monitoring, and national defense security due to its high temporal and spatial resolution and high detection accuracy. According to the measurement principle of atmospheric detection lidar, the frequency stability of its light source will have a great influence on the measurement and inversion of atmospheric parameters. Therefore, it is particularly important to stabilize the frequency of the light source. The four laser frequency stabilization technologies and characteristics currently used in atmospheric detection lidar are reviewed. The application research status of these frequency stabilization technologies in atmospheric detection lidar is introduced, which provides reference for the future development of high-precision atmospheric detection lidar.
		2023 Vol. 44 (2): 186-194 [Abstract] ( 237 ) HTML (1 KB) PDF (2075 KB) ( 523 )

	195	High Accuracy Triple Point of Water Cells
		MENG Zhe-jian,BAO Fu-bing,YAN Xiao-ke,YIN Zhao-qin,TU Cheng-xu,TENG Jun-heng
		DOI: 10.3969/j.issn.1000-1158.2023.02.06
		The high-precision realization and accurate measurement of triple point of water (TPW) are the keys to ensure the implementation of the International Temperature Scale of 1990 (ITS-90). The isotopic compositions of the high purity water in the TPW cells affect the temperature of TPW. In order to improve the TPW realization and reduce the influence of hydrogen and oxygen isotopes, quartz and borosilicate glass high-accuracy TPW cells with hydrogen and oxygen isotopic analyses were developed. In order to evaluate the performance of the cells, comparisons between the borosilicate glass cells and the quartz cells were carried out. The experimental results show that, before the isotopic corrections, the temperature differences between the quartz and borosilicate glass high-accuracy TPW cells are within 0.058mK. After application of the corrections, the temperature differences are within 0.017mK. The expanded uncertainty of the realization of TPW using high-accuracy TPW cells is 0.066mK (k=2).
		2023 Vol. 44 (2): 195-202 [Abstract] ( 177 ) HTML (1 KB) PDF (1990 KB) ( 520 )

	203	Research Progress of Laser Flash Method in Measuring Thermal Diffusivity of Solid Materials
		ZHANG Jia-rui,ZHANG Sheng-zi,LIU Xiao-meng,WANG Hong-jun,ZHANG Ge
		DOI: 10.3969/j.issn.1000-1158.2023.02.07
		The laser flash method based on the transient principle is widely used and plays an important role in measuring thermal diffusivity of solid materials due to its advantages of small sample size and short test cycles. According to the research progress in the types of measurable materials, key technical problems, optimization and improvement of laser flash method in recent years, the application of laser flash method is introduced, and its research priorities, difficulties and research values are analyzed and summarized. Finally, the existing challenges and prospects of laser flash method are discussed, it will provide reference for the future application of laser flash method in more fields.
		2023 Vol. 44 (2): 203-210 [Abstract] ( 207 ) HTML (1 KB) PDF (636 KB) ( 443 )

	211	Influence of Coriolis Mass Flowmeter Amplitude on Zero Point
		HUANG Ya,XU Ke-jun,LIU Chen-ci
		DOI: 10.3969/j.issn.1000-1158.2023.02.08
		Aiming at the problem of the zero drift caused by the change of the Coriolis mass flowmeter amplitude, the flexural vibration equation of the flow tube is first established by simplifying the model, the displacement response of the two detection points is solved, and the linear relationship between the zero phase difference and the amplitude is obtained; Then, the amplified signals of the sensors under different amplitudes are collected, a zero-crossing detection algorithm to calculate the zero-point phase difference is written, a straight line between the zero point and the amplitude is established, and the linear relationship between the zero point and the amplitude through experiments is verified; Finally, combined the verification procedures and the zero point calculation results, the measurement error introduced the zero point drift caused by the amplitude change is analyzed qualitatively and quantitatively, the results show that the greater the amplitude change, the greater the measurement error introduced, when the flow rate is 10kg/min, the amplitude change 10mV introduces a measurement error of 0.727%.
		2023 Vol. 44 (2): 211-218 [Abstract] ( 199 ) HTML (1 KB) PDF (2348 KB) ( 508 )

	219	One Dimensional Flow Analysis for Sonic Nozzles with Computation of Shock
		SHEN Yu-ming,TIAN Tong
		DOI: 10.3969/j.issn.1000-1158.2023.02.09
		A discussion of some concepts such as critical back pressure ratio in detail for venturi sonic nozzles was presented. A flaw of the definition of back pressure ratio in ISO 9300 was pointed out. Then it has been mathematically proved, according to the one-dimensional isentropic flow theory, that when the ratio of the throat pressure to the upstream stagnation pressure of venturi nozzles reaches the critical pressure ratio, the fluid flow reaches a sonic speed at the throat with a maximum mass flow rate through the nozzle . A formula for flow through the venturi nozzle under real conditions was mathematically derived based on the previous discussion.Compared with ISO 9300, the derived formula includes a correction of compressibility factor at throat condition 1/Znt. At last, a discussion of the mechanism of shock generation in the diffuser was also presented from the basic equations of gas dynamics with the aim to develop the one-dimensional flow computational models for the shockwave generation position, pressure, and Mach number before and after the shockwave. The computational results were verified by numerical simulation and compared with the experimental data of Craig A. The results show that the maximum error of the minimum exit pressure ratio between the computational results and the experimental data is less than 17%.
		2023 Vol. 44 (2): 219-225 [Abstract] ( 143 ) HTML (1 KB) PDF (2030 KB) ( 91 )

	226	Measurement of Falling Ball Viscosity of Nitrocellulose Base on Two-segment Method and Changing Falling Ball Height
		LUO Yu-ying,GUO Ze-rong
		DOI: 10.3969/j.issn.1000-1158.2023.02.10
		To improve the accuracy of measuring the viscosity of nitrocellulose by falling ball method and reduce the error caused by the non-uniform movement of small ball within the falling ball distance, an accurate measurement method based on two-segment method and changing falling ball height was proposed. PLC and photoelectric sensors were used to design the experimental device. Test solutions with different viscosities were selected to obtain the timing values of different ball drop heights. The suitable drop heights were obtained by fitting the data. The measurement error of traditional and suitable drop height was compared. Experimental results show that there is a negative correlation between the suitable drop height and the viscosity of the test solution; when the viscosity is greater than 60300mPa·s, the suitable drop height is at the drop pipe orifice; when the viscosity is less than 60300mPa·s, releasing the small ball at the appropriate falling height can reduce the measurement error; the lower the viscosity, the more obvious the effect of error reduction.
		2023 Vol. 44 (2): 226-230 [Abstract] ( 167 ) HTML (1 KB) PDF (1178 KB) ( 84 )

	231	The Slope Fitting Method of Sonar Point Cloud on the Inner Wall of Sewer Based on Density Algorithm and Tangent Slope Fitting of the Circle
		WU Jun-hao,LI Chen,WANG Rong,LIU Wen-li,ZHOU Xing-yu
		DOI: 10.3969/j.issn.1000-1158.2023.02.11
		To solve the problem that the scan results of the ring scan sonar are affected by the sound of mixed water in the drainage pipe, a method for denoising the point cloud data of the sonar scan is proposed. On the basis of the three-dimensional point cloud data obtained by the ring scan sonar, the density clustering optimization algorithm (DBSCAN) is used to remove the noise in the point cloud data. Then, the method of fitting the slope of the outer tangent of the circle is used to identify the boundary of the inner wall of the pipeline and the silt deposition line, and finally obtain a model including the boundary of the inner wall of the drainage pipe and the characteristics of the silt line. To verify the effectiveness, a drainage pipeline in Wuhan is taken as an example for analysis, and performs data denoising and feature extraction based on 980000 point cloud coordinates collected on site. The results show that after the initial screening of the point cloud data using the density clustering optimization algorithm, the SFA-COT can effectively identify the inner wall boundary and the siltation line of the drainage pipe. The mean square error of the fitting radius is 0.0071m, which has higher fitting accuracy and better denoising effect than the single density clustering algorithm.
		2023 Vol. 44 (2): 231-237 [Abstract] ( 152 ) HTML (1 KB) PDF (2887 KB) ( 300 )

	238	Design of a Hydrophone Sensitivity Calibration System in Variable Temperature Environment
		CHEN Si-qiang,LI Xue-jian,WANG Yue-bing,ZHAO Peng
		DOI: 10.3969/j.issn.1000-1158.2023.02.12
		Aiming at the lack of a method for calibrating the sensitivity of hydrophones under variable temperature conditions, a temperature-variable hydrophone sensitivity calibration system based on the sound tube of the moving coil transducer was designed. A model was established to analyze the sound pressure distribution in the sound tube, and the compensation amount for the sensitivity calibration result after changing temperature was calculated; Comsol was used to simulate the influence of different sound tube thicknesses on the sound field, and the non-uniform vibration of the bottom surface and the effect of different sizes of hydrophones on the calibration were analyzed. Influence of the results, the appropriate acoustic tube size and measurement method were determined. The hydrophones of different sizes were calibrated under normal and variable temperature conditions and the calibration results were compared with the standard values. The results show that the deviation of the calibration result of this system from the standard value is less than 0.5dB at normal temperature, and the deviation of the measurement result from the standard value under the condition of variable temperature is less than 0.6dB, and the expanded uncertainty of the whole system is about 1.0dB.
		2023 Vol. 44 (2): 238-245 [Abstract] ( 138 ) HTML (1 KB) PDF (1766 KB) ( 127 )

	246	Calculation of Test Cell Capacitance of Insulating Oils Dielectric Dissipation and Resistivity Tester
		JIA Duo,Lü Jin-hua,CAI Jin-hui
		DOI: 10.3969/j.issn.1000-1158.2023.02.13
		The test cell is an important part of the insulating oils dielectric dissipation and resistivity tester. The capacitance of test cell with air as the medium affects the measurement accuracy and calibration results of the instrument. In order to obtain the accurate capacitance value of the test cell, according to the geometric structure, the physical model of the parallel distribution of the cone capacitance and the cylinder capacitance is used to derive the theoretical calculation formula, and the modeling and simulation are compared. The results show that the theoretical calculation method has high accuracy and can be used to guide the design and calibration of the tester.
		2023 Vol. 44 (2): 246-251 [Abstract] ( 165 ) HTML (1 KB) PDF (1410 KB) ( 227 )

	252	Multi-objective Optimization Algorithm Based on Particle Swarm and Clustering
		XIONG Zhi-jian,WANG Xiao-jing,YANG Jing-ming,WANG Wei-fang,ZHAO Zhi-wei
		DOI: 10.3969/j.issn.1000-1158.2023.02.14
		To solve the problem that the particle swarm optimization algorithm is easy to fall into the local optimum.A multi-objective optimization algorithm based on the combination of particle swarm optimization and clustering method is proposed.The algorithm is based on the method of reference vector decomposition, and the global optimal solution is updated through the clustering optimization particle strategy.First, the particles are clustered by each uniformly distributed reference vector to promote the diversity of particles. A particle with the smallest aggregation function fitness value is selected from each cluster in order to balance convergence and diversity.The global optimal solution and the individual optimal solution are dynamically updated, and the population is guided to be evenly distributed near the Pareto front.It is compared with the four particle swarm multi-objective optimization algorithms through simulation experiments.Experimental results show that the proposed algorithm obtains 20 IGD optimal values on 27 selected benchmark problems.
		2023 Vol. 44 (2): 252-257 [Abstract] ( 182 ) HTML (1 KB) PDF (1085 KB) ( 378 )

	258	Measurement and Calculation of C Field of Cesium Fountain Clock
		LIU Hong-kang,LIU Kun,HAN Lei,FANG Fang,CHEN Wei-liang,ZHENG Fa-song,DAI Shao-yang,ZUO Ya-ni,LI Tian-chu
		DOI: 10.3969/j.issn.1000-1158.2023.02.15
		In the cesium fountain clock experiment, the magnetic uniformity of C field determines the uncertainty evaluation of the second order Zeeman frequency shift. Microwave excitation method can be used to measure the average value of the time-weighted magnetic induction intensity at each height of the C field. In order to obtain the actual magnetic field distribution of C field, the measurement results of microwave excitation method need to be de-weighted. To introduces two de-time-weighted algorithms and verifies them with simulation data. Finally, the C field of NIM6 cesium fountain clock is measured and calculated by microwave excitation method and two de-time-weighted algorithms combined with Monte Carlo uncertainty evaluation method.
		2023 Vol. 44 (2): 258-264 [Abstract] ( 151 ) HTML (1 KB) PDF (2162 KB) ( 223 )

	265	The Effect and Analysis of Combustion Equation Applied in Dynamic Measurement of Remote Sensing Equipment for Motor Vehicle Exhaust
		SHEN Shang-yi,LIAO Xiao-qin,ZHANG Guo-cheng,YANG Yang,YANG Zhen-qi,Lü Chao
		DOI: 10.3969/j.issn.1000-1158.2023.02.16
		Remote sensing of exhaust gas is widely applied in vehicle emission monitoring. However, the evaluation method for dynamic measurement is limited. Two kinds of static calibration device were compared, the results showed that the assistant computation of combustion equation corrected the measuring data and avoided the influence of diffusion of plume. According to molecular weight difference of C3H8 and 1,3-C4H6 in combustion equation, the ratio of each component in standard gas was definite. And two kinds standard gas were prepared and verified by dynamic measurement. The results indicated that the gas components accorded with the combustion equation could evaluate the accuracy of monitoring date for low concentration components. Thus, the results of the researche could guidance the preparation of standard gas for remote sensing equipment, and enrich the testing methods for dynamic measurement.
		2023 Vol. 44 (2): 265-270 [Abstract] ( 148 ) HTML (1 KB) PDF (1955 KB) ( 121 )

	271	Prediction of SO₂ Concentration at Desulfurization Outlet Based on MIC and MPA-KELM
		YAN Hao-si,ZHAO Wen-jie
		DOI: 10.3969/j.issn.1000-1158.2023.02.17
		The establishment of SO₂ concentration prediction model at desulfurization outlet is the basis for realizing the economic operation of desulfurization system. Aiming at this problem, a SO2 concentration prediction model at desulfurization outlet based on variable selection of maximum information coefficient (MIC) and marine predation algorithm (MPA) optimized nuclear limit learning machine (KELM) was proposed. Firstly, the mechanism analysis method was used to screen the variables affecting the SO₂concentration at the outlet, and the expression method of comprehensive flow of circulating slurry was proposed to describe the influence characteristics of slurry circulating pump combination. On this basis the input variables of the model were determined by the variable selection algorithm based on the maximum information coefficient. Then, MPA was used to optimize the regularity coefficient C and nuclear parameter S of KELM, and the outlet SO₂ concentration prediction model of MPA-KELM was established. Finally, the simulation experiment was carried out by using the operation data of the power plant. The results show that after variable selection, the mean square error and average absolute percentage error of MPA-KELM model are 1.23666mg/m³ and 4.9876% respectively. The prediction accuracy is high, which can provide technical support for the on-site optimal control of SO₂ in the desulfurization system.
		2023 Vol. 44 (2): 271-278 [Abstract] ( 104 ) HTML (1 KB) PDF (2960 KB) ( 149 )

	279	Research on the Counting Efficiency Evaluation and Method of Bioaerosol Monitoring Instrument Based on Fluorescence Method
		PAN Yi-ting,ZHANG Guo-cheng,HUO Sheng-wei,TIAN Ying,LIU Jia-qi,YANG Zhen-qi,SHANG Yu-yang
		DOI: 10.3969/j.issn.1000-1158.2023.02.18
		Bioaerosol monitor is a kind of new instrument for fast and real time monitoring of air bioaerosol. The study evaluated the counting efficiency of the total particle channel and fluorescent particle channel of bioaerosol monitor instrument. First, a set of evaluation device for counting efficiency of bioaerosol monitor was designed and built. Then, the monodisperse and stable fluorescent polystyrene microspheres were prepared by SI-ATRP method. Bioaerosol environment was generated by atomizing fluorescent particles and found that the counting efficiency of total particle number and fluorescence particle number was 98.9% and 98.1%, respectively. The results showed that the device can meet the needs of the evaluation of the counting efficiency of the fluorescent bioaerosol monitor. It provided a scientific method for systematically evaluating the counting efficiency of a bioaerosol monitor, and the result was of great significance to the detection of bioaerosols.
		2023 Vol. 44 (2): 279-283 [Abstract] ( 202 ) HTML (1 KB) PDF (1469 KB) ( 480 )

	284	Research of On-line Monitoring of Ozone Concentration Based on Association Correlation and Differential Optical Absorption Spectroscopy-Fourier Transform
		ZHENG Hai-ming,YAO Peng-hui
		DOI: 10.3969/j.issn.1000-1158.2023.02.19
		The on-line measurement of ozone concentration was carried out by co-correlation and Fourier transform differential absorption spectroscopy. First, a set of generator that can be used for on-line monitoring of ozone concentration in the laboratory was created, and its measurement accuracy can reach 0.1×10^-6. Then, the best background spectrum and absorption spectrum can be obtained by calculating the measured multi group background spectrum and absorption spectrum by using the co correlation, so as to accurately retrieve the ozone absorption cross section and optimize the calculation process of ozone concentration. Finally, Fourier transform differential absorption spectroscopy and inverse Fourier transform were used to retrieve ozone concentration in 320～350nm band, the interference of system noise was successfully eliminated and the quadratic equation for retrieving ozone concentration was obtained.
		2023 Vol. 44 (2): 284-289 [Abstract] ( 111 ) HTML (1 KB) PDF (1903 KB) ( 137 )

	290	Application of Adaptive Artificial Bee Colony Optimization Extreme Learning Machine in Quantitative Analysis of Blood by Raman Spectroscopy
		PIAN Fei-fei,WANG Qiao-yun,WANG Ming-xuan,ZHANG Chu,SHAN Peng,LI Zhi-gang
		DOI: 10.3969/j.issn.1000-1158.2023.02.20
		A method based on adaptive differential evolution artificial bee colony optimization extreme learning machine is proposed to predict the concentration of each component of blood. First, the artificial bee colony algorithm is used to iteratively optimize the input weights and hidden layer thresholds; secondly, the differential evolution is combined to further improve the model accuracy and avoid problems such as falling into local optimality in the later stage; due to the fact that the crossover rate and mutation rate of the differential evolution algorithm are based on experience, the idea of adaptive adjustment is introduced, and the model of adaptive differential evolution artificial bee colony algorithm to optimize the extreme learning machine algorithm is proposed and applied to the quantitative analysis of blood components. Experiments show that the extreme learning machine model optimized by the adaptive differential evolution artificial bee colony algorithm has high prediction accuracy, and the model has strong robustness.
		2023 Vol. 44 (2): 290-295 [Abstract] ( 144 ) HTML (1 KB) PDF (2480 KB) ( 262 )

	296	Course Classification of Cognitive Disorders Based on Improved Attention Mechanism
		LI Mei-mei,HU Chun-hai,ZHOU Ying,SONG Xin
		DOI: 10.3969/j.issn.1000-1158.2023.02.21
		Alzheimer's disease (AD) is a neurodegenerative disease with a slow onset process and continuous deterioration over time. With the trend of aging, the number of AD patients is increasing. Therefore, how to make an early accurate diagnosis and positive intervention is an urgent problem to be solved. In order to improve the efficiency of computer-aided diagnosis and promote the study of pathophysiological mechanism of diseases, an improved two-dimension dual-path fusion network based on the SE module is proposed. A reduction coefficient module is added to the network to increase the proportion of useful information in images. The weight function of the channel attention module is redesigned to increase the difference between feature maps, and the network is combined with the two-dimensional dual-path network to increase the network emphasis, so as to achieve better classification performance and prevent model overfitting. The ADNI dataset is used to classify AD, EMCI and NC. The experimental results show that the accuracy of the proposed model is improved by 5.59% and 8.11% compared with the VGG and two-dimensional dual-path fusion model, respectively, which verifies the feasibility of the proposed method.
		2023 Vol. 44 (2): 296-303 [Abstract] ( 162 ) HTML (1 KB) PDF (4026 KB) ( 453 )

	304	Development of Glucose in Human Serum Reference Material
		LI Wu-rong,YANG Bin,HUANG Yan-jie,ZHANG Ning,LUO Si-ting,WANG Jing,WU Quan-zhou,WU Li-Qing
		DOI: 10.3969/j.issn.1000-1158.2023.02.22
		Blood glucose is a direct indicator for diagnosis and discrimination of diabetes, and reference materials are important guarantee for the accuracy and comparability of blood glucose detection results.The process of developing glucose in human serum reference materials with six different concentration levels includes the preparation, value determining, uniformity, stability test, uncertainty evaluation and interoperability evaluation of reference materials. Two different principles of isotope dilution liquid chromatography tandem mass spectrometry and isotope dilution gas chromatography mass spectrometry were used to determine the concentration value of glucose in human serum, and the differences and causes between the analysis results of the two methods were analyzed. The quantitative value of glucose in human serum reference material at different concentration levels in human serum covers 1.70~28.12mmol/L. This series of reference material have good uniformity and stability, and have obtained the gradation certificate of national secondary certified reference material, the number is GBW (E) 091140~GBW(E) 091145, which are expected to be used in clinical tests and related areas for quality evaluation of measurement of serum glucose items and other aspects.
		2023 Vol. 44 (2): 304-310 [Abstract] ( 161 ) HTML (1 KB) PDF (1338 KB) ( 389 )

	310	Development of Key Parameter Metrology and Detection Equipment for Q-switched Nd:YAG Laser Therapy Apparatus
		WU Fu-bao,HU Zhi-xiong,DUAN Liang-cheng,ZHONG Kai,XU Bao-zhong,LIU Wen-li,YAO Jian-quan
		DOI: 10.3969/j.issn.1000-1158.2023.02.23
		In view of the difficulty in traceability of the key parameters of pulsed laser therapy apparatus, a metrology and detection equipment for the key parameters of Q-switched Nd:YAG laser therapy apparatus based on LabVIEW and USB bus technology was designed and developed. The equipment can measure and detect the key parameters of the treatment laser and the aiming laser and generate the detection report automatically. The main function modules of the system are:pulse width, energy, repetition frequency, spot size and beam dispersion angle, wavelength and aiming laser power measurement. In the spot measurement module, the feedback mechanism into the traditional "knife-edge method" was introduced and the automatic measurement was realized, which can adapt to the laser of different pulse frequencies. Furthermore, the traceability method was further studied, and the uncertainty of spot size measurement reached 3.2%. The uncertainty of other parameters of the laser therapy apparatus measurement and detection equipment was also analyzed, including laser wavelength, pulse width, energy, repetition frequency, and aiming laser power, the uncertainties are 0.6 nm, 4.0%, 3.2%, 0.12% and 3.4%, respectively.
		2023 Vol. 44 (2): 310-316 [Abstract] ( 149 ) HTML (1 KB) PDF (2379 KB) ( 173 )

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