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2021 Vol. 42, No. 6 Published: 2021-06-28

	689	Heralded Entangled Single-photon Source and Research on the Traceability System of the Optical Radiation Based on the Quantization
		YU Bing,JIN Wei-qi,YUAN Lin-guang,YANG Hong-ru,WU Lei,MA Shi-bang,YOU Yue,CHEN Juan
		DOI: 10.3969/j.issn.1000-1158.2021.06.01
		A kind of entangled single-photon source was proposed to meet the requirements of the measurement and traceability of very weak energy level from a single-photon to femto-joule. The heralded entangled photon pairs at 795 nm wavelength were generated through four wave mixing based on the cold atoms. The narrowband paired and high-quality single-photon source was obtained through the suppression of background radiance and real-time compensation, high precision laser frequency stabilization, timing pulse precise synchronization. On this basis, the calibration methods of entangled photon source parameter were studied. The further establishment of the new optical radiation traceability system based on the quantum basic standards were considered, which is to reduce the measurement uncertainty of very weak optical radiation parameters.
		2021 Vol. 42 (6): 689-693 [Abstract] ( 252 ) HTML (1 KB) PDF (1801 KB) ( 648 )

	694	Multiple Kernel Empirical Learning Network with Gradually Enhanced Region and Receptive Field
		LIU Bin,LIU Jing,WU Chao,LI Ya-qian,ZHANG Ya-ru,YANG You-heng
		DOI: 10.3969/j.issn.1000-1158.2021.06.02
		In order to fully extract the identifiable information in the image and improve classification accuracy rate, a structure named multiple kernel empirical learning network(MKELN) was proposed. In the feature extraction part, the original image is gradually enhanced by the two-dimensional Gaussian distribution. The local receptive field and the global receptive field are used to fully extract features in the original image and the gradually regional enhancement image, and they are connected in series to form feature vector that represents an image. In the classification part, a multiple kernel empirical algorithm was proposed, and the low rank feature matrix is used as the hidden layer of the network to solve the output weight of the network. To verify the effectiveness of this network, it was tested with USPS, MNIST and NORB data sets. The experiment proves that the proposed MKELN can further extract feature information based on ELM-LRF, effectively improving the classification accuracy.
		2021 Vol. 42 (6): 694-703 [Abstract] ( 235 ) HTML (1 KB) PDF (2760 KB) ( 168 )

	704	Complicated Point Cloud Model Segmentation Based on Multi-view Region Growing
		KONG De-ming,ZHANG Na,WANG Shu-tao,SHI Hui-chao
		DOI: 10.3969/j.issn.1000-1158.2021.06.03
		In order to improve the segmentation accuracy of the 3D point cloud model in the feature fuzzy region, a segmentation method based on multi-view region growing was proposed.Based on the principle of direction difference of normal vectors of grids, the model was divided into different categories of sub-regions.Then the one-to-one mapping relationships between point cloud and multi-view distance images were established in the corresponding regions.The sensitivity of Canny operator for gray level was used to obtain independent connected domains and their barycentric coordinates were calculated. The corresponding points were extracted as seed points in 3D point cloud.To separate the adjacent surfaces, the offset angle of normal vectors of grids was introduced.At the same time, the remaining independent surfaces were extracted according to the principle of iterative nearest points.To achieve segmentation optimization, KNN algorithm was used to remove the off-group points.Experiments were carried out on the selected model data set.The results showed that the complicated point cloud model could be divided reasonably by the proposed method, and the segmentation accuracy was not less than 80%.
		2021 Vol. 42 (6): 704-709 [Abstract] ( 250 ) HTML (1 KB) PDF (2540 KB) ( 439 )

	710	A Visual Detection Method for Particle Size of Moving Coarse Aggregate Based on Morphological Reconstruction and Reverse Tracking
		CHEN Ze-qi,FAN Wei-jun,GUO Bin,JIANG Wen-song
		DOI: 10.3969/j.issn.1000-1158.2021.06.04
		Based on image process method, the detection of particle size for the moving coarse aggregate during the blanking process was studied. A mask-based region of interest (ROI) extraction method combined with the region growth method was introduced to solve the statistical problem of incomplete aggregates at the edge of the image. And a ROI image was gotten in which the aggregate particles had a complete morphology. Then, a statistical method determined the maximum frame sampling interval, ensuring every aggregate counted and image processing efficiency increased. Aiming at solving the problem of aggregates which appeared repeatedly in consecutive images, a reverse tracking algorithm based on touch-type association gate was proposed to recognize the recurring aggregate particles, which avoided the repeated statistics of the same aggregate particles in consecutive images. Finally, the aggregate size distribution was analyzed by using the equivalent ellipse Feret minor axis as the equivalent particle size of aggregate and optimizing the relationship between pixel size and actual size. The experimental results show that the accuracy of recurring particle recognition is 98.08% and the accuracy of aggregate size distribution is 95.59%.
		2021 Vol. 42 (6): 710-717 [Abstract] ( 291 ) HTML (1 KB) PDF (2818 KB) ( 151 )

	718	Vehicle Flow Detection Based on YOLOv3 and DeepSort
		CHEN Jia-qian, JIN Xuan-hong, WANG Wen-yuan, LU Ying-jie
		DOI: 10.3969/j.issn.1000-1158.2021.06.05
		In view of the shortcomings of the traditional multi-target tracking algorithm, such as low detection accuracy and poor robustness, according to the classic Tracking-By-Detection mode, a vehicle flow detection method based on YOLOv3 and DeepSort is proposed, which realizes the real-time monitoring and tracking of the end-to-end vehicle flow video in vehicle video monitoring. The video vehicle target is detected by deep learning YOLOv3 algorithm, and then the detected vehicle is tracked in real time by deep learning DeepSort algorithm. The experimental results show that the method has good detection effect on traffic flow when dealing with the influence of fast moving vehicles and ambient light, and the average accuracy is up to 94.7%. The end-to-end algorithm is feasible and effective, which is suitable for video batch processing.
		2021 Vol. 42 (6): 718-723 [Abstract] ( 327 ) HTML (1 KB) PDF (2584 KB) ( 932 )

	724	Quality Inspection of Overall Bolt Dimension with Actual Edge Profile
		KONG Ming, XU Zhi-ling, XU Yong, WANG Kun, LIU Zi-hao
		DOI: 10.3969/j.issn.1000-1158.2021.06.06
		In order to detect the dimensional quality of bolts, a comprehensive quality inspection algorithm with the actual edge profile was proposed. The algorithm starts with designing tolerance zone diagrams for bolt dimension as template diagrams according to the tolerance requirements on bolt drawing. Then performing preprocessing to bolt images, including three-piecewise linear grayscale enhancement, median filtering, and maximum inter-class variance, etc. Further rotating the bolt images to a horizontal position and performing canny edge detection, cropping the bolt images and the template images to obtain a binary image with the same position, size and white edge contour. Finally, carrying out image addition operation to the processed bolt images and template images. Whether the overall size of the bolt is qualified can be determined by comparing the number of white pixels of the template images and the images after image operation. Furthermore, a discrete sequence diagram detection method was proposed to realize the comprehensive dimensional quality detection of bolts all around.
		2021 Vol. 42 (6): 724-730 [Abstract] ( 279 ) HTML (1 KB) PDF (1982 KB) ( 179 )

	731	Evaluation of Uncertainty in Measurement with White-light Interference System
		CAI Xiao-yu, WEI Jia-si, SUN Kai-xi, LIU Na, ZHANG Xue-dian, ZHUANG Song-lin
		DOI: 10.3969/j.issn.1000-1158.2021.06.07
		White-light interference system (WLIS) is widely used in the measurement of micro-nano surface morpography. The evaluation of measurement uncertainty is an important work to study the metrological characteristics of WLIS. The measurement models of pitch and step height by WLIS were built and the sources of uncertainty were determined. A 50× objective lens was used to measure a pitch standard and a step height standard, which nominal values are 5000 nm and 180 nm respectively. By analyzing the measurement repeatability, optical component quality, sensor parameters, motion module performance, test method and environment of WLIS, the combined measurement uncertainty of pitch and step height measurement are evaluated as 21 nm and 0.4 nm. The uncertainty analysis of WLIS ensures the accuracy and traceability of the measurement results, therefore, provides necessary references for dissemination of the nano-micro dimensional values by WLIS.
		2021 Vol. 42 (6): 731-737 [Abstract] ( 244 ) HTML (1 KB) PDF (1801 KB) ( 455 )

	738	Study on Determining Correction Distance of Ultrasonic Longitudinal Wave Transducers Used in Indirect Transmission Method
		YANG Yu, BAO Ting, WANG Yi, XU Hao
		DOI: 10.3969/j.issn.1000-1158.2021.06.08
		The method of determining the correction distance when ultrasonic longitudinal wave transducers are used in indirect transmission arrangement is discussed. Firstly, according to the theory of elastic wave, the actual physical meaning of using the indirect transmission arrangement to measure wave velocity instead of the direct transmission arrangement is analyzed. Secondly,the actual propagation distance of the two arrangements are analyzed and transit times of the two arrangements are compared through a designed cutting-measurement experiment on a concrete specimen. Lastly, linear regression equation is obtained from the experimental data of the indirect transmission arrangement and the least square method is proposed to calculate the correction distance for the indirect transmission arrangement. The experiment results show that the difference between the wave velocity calculated with the correction distance and the wave velocity measured with direct transmission arrangement is less than 2%. The conclusion is the indirect transmission arrangement can be used to measure wave velocity instead of the direct transmission arrangement under certain condition. However, the correction distance should be determined from experiments, and measurement parameters in the experiments should be kept in practice to ensure the effectiveness of the correction distance.
		2021 Vol. 42 (6): 738-744 [Abstract] ( 276 ) HTML (1 KB) PDF (2478 KB) ( 149 )

	745	Hysteresis Modeling Method for Pneumatic Muscle Based on Multi-Branch BP Neural Network
		XIE Sheng-long,ZHANG Wen-xin,ZHANG Wei-min, REN Guo-yin,LU Yu-jun, LU Qing
		DOI: 10.3969/j.issn.1000-1158.2021.06.09
		A novel modeling method based on multi-branch BP neural network is proposed to describe the displacement/pressure hysteresis of pneumatic muscle. Firstly, the displacement/pressure hysteresis characteristic test system was built to obtain the displacement/pressure hysteresis loops of pneumatic muscle. Then, the classical BP neural network, multi-branch BP neural network and Prandtl-Ishlinskii model are used to fit the hysteresis loop of pneumatic muscle, respectively. Finally, the comparative study found that the multi-branch BP neural network can effectively avoid the over-fitting phenomenon in the fitting process of classical BP neural network, and the modeling capacity is obviously better than the traditional Prandtl-Ishlinskii model. Compared with Prandtl-Ishlinskii model, the mean average, mean square and maximum errors of multi-branch BP neural network are reduced by 87.45%, 86.68% and 74.73%.
		2021 Vol. 42 (6): 745-752 [Abstract] ( 232 ) HTML (1 KB) PDF (3981 KB) ( 490 )

	753	A Method of On-line Integration Roughness Measurement Based on Chromatic Spectrum Confocal
		ZHOU Yong, LI Jian-jun, ZHAO Tian-ming, WANG Zhen-hong, TANG Sheng-jiang
		DOI: 10.3969/j.issn.1000-1158.2021.06.10
		A method of on-line integration roughness measurement based on chromatic spectrum confocal is put forward for achieving the measurement of microcosmic profile synchronization with the dimensional and distortion tolerance,and improving the efficiency of machining and testing.The non-contact measurement ability is established by constructing the measuring system and integration the abilities of system communication control and Gaussian profile filtering on LabVIEW.The measurement results of the step height standards and roughness standard sample show that the system has a good measuring accuracy and repeatability.The measuring repeatability of the parameter Ra is 0.0026μm.It has a certain application prospect in optimizing measurement process and improving measuring efficiency.
		2021 Vol. 42 (6): 753-758 [Abstract] ( 238 ) HTML (1 KB) PDF (3169 KB) ( 688 )

	759	Theoretical Model and Verification of Annealing Characteristic of the New Standard Platinum Resistance Thermometer
		YU Fan, SUN Jian-ping, LI Ting, ZHU Tian-meng, WANG Cheng-ke
		DOI: 10.3969/j.issn.1000-1158.2021.06.11
		According to the theory of recrystallization kinetics, two theoretical models were established for the change law of the triple point resistance of water with time during the first annealing of a new standard platinum resistance thermometer (SPRT), it was concluded that that the dimensionless resistance value change have the dimensionless resistance value change has the characteristics of an exponential function and the linear characteristic of the double logarithmic dimensionless resistance value change function. Based on the experimental data of 15 SPRTs annealed at 660 ℃, the range and average value of annealing parameters and annealing index were obtained. The calculated results of theoretical model showed that the stability of SPRTs could reach about 1mK after 1 000 hours. The annealing average stability curve of SPRT could reflect the change law of the annealing stability of the thermometer to a certain extent, and could provide a theoretical prediction and reference for the reasonable annealing process.
		2021 Vol. 42 (6): 759-764 [Abstract] ( 273 ) HTML (1 KB) PDF (2637 KB) ( 418 )

	765	Research on Calibration Technology of Force Measuring Tool Holder System
		WU Feng-he,ZHANG Ning,LI Yuan-xiang,GUO Bao-su
		DOI: 10.3969/j.issn.1000-1158.2021.06.12
		The force measuring tool holder system can be used to monitor the axial force and torque changes during the cutting process in real time. In order to ensure the accuracy of the measurement data of the designed force measuring tool holder system, a set of calibration auxiliary devices is developed, a static and dynamic calibration experiment platform is built, and the static and dynamic calibration experiments are completed. The static characteristic indexes such as linearity, repeatability and hysteresis of the force measuring tool holder system are determined by the step-by-step loading and unloading method. The dynamic characteristic indexes such as natural frequency, damping ratio and maximum working frequency of the force measuring tool holder system are obtained by the pulse method.Finally, the drilling and milling experiments are carried out, and the results show that the measurement errors of the system in the axial direction and torque direction are less than 2% compared with the Kistler dynamometer, which means that the system can accurately reflect the changes of axial force and torque in the dynamic cutting process.
		2021 Vol. 42 (6): 765-773 [Abstract] ( 273 ) HTML (1 KB) PDF (4024 KB) ( 261 )

	774	Fault Diagnosis Method of Rolling Bearing Based on IITD Fuzzy Entropy and Random Forest
		CHEN Jian,CAI Kun-qi,TAO Shan-yong,YANG Bin,LIU Yuan-yuan,LIU Xing-fu,HUANG Kai-xuan
		DOI: 10.3969/j.issn.1000-1158.2021.06.13
		Aiming at the problem that it is difficult to identify the weak vibration signal feature of rolling bearing faults, a rolling bearing fault diagnosis method based on improved intrinsic time scale decomposition (IITD) and fuzzy entropy (FE) input random forest (RF) pattern recognition was proposed. First, the bearing test bench was used to collect the vibration signals of the bearing in four states: normal, rolling body failure, inner ring failure, and outer ring failure; the collected vibration signals were decomposed into a set of proper rotation components (PRC) by IITD decomposition, Then selected the effective component that represents the main information of the fault to calculate its fuzzy entropy value and constructed the feature vector, which was input to a random forest classifier model for identification and classification. The experimental data analysis results show that this method can effectively realize the diagnosis of rolling bearing fault categories.
		2021 Vol. 42 (6): 774-779 [Abstract] ( 209 ) HTML (1 KB) PDF (1556 KB) ( 291 )

	780	Research on Sound Field Measurement Method of Focusing Transducer Based on Near-field Acoustic Holography
		LIU Hai-nan, ZHAO Peng, YE Xiao-tong, WANG Yue-bing
		DOI: 10.3969/j.issn.1000-1158.2021.06.14
		High-intensity focused ultrasound (HIFU)is widely used in the medical field, but the intensity at the focus of the focused transducer is relatively large, and direct measurement is likely to cause damage to the hydrophone. In order to obtain the sound pressure at the focus indirectly, the holographic measurement surface is approximately equivalent to the sound source surface and combined with the space Fourier transform algorithm, a high-efficiency focused transducer sound field measurement method is proposed. The spherical self-focused transducer is used as the object to carry out simulation research and experimental verification of the sound field measurement method. The results show that the proposed method is twice as efficient as the integral method and the measurement error is kept within the effective range. This method can be effectively used for the focused transducer sound field measurement.
		2021 Vol. 42 (6): 780-784 [Abstract] ( 220 ) HTML (1 KB) PDF (2129 KB) ( 430 )

	785	High-order Dynamic Model and Simulation of Closed-loop Fiber-optic Current Sensor
		LI Qi,LI Chuan-sheng,ZHAO Ye-ming,SHAO Hai-ming,CAI Jin-hui
		DOI: 10.3969/j.issn.1000-1158.2021.06.15
		In order to study the pulse current measurement capability of the fiber-optic current sensor, a high-order dynamic model of the sensor in the discrete domain was established, and the step response and frequency response characteristics of the sensor were simulated and analyzed based on Simulink. The results show that increasing the forward gain can improve the sensors response speed and the bandwidth, but too large forward gain will cause the system to overshoot the oscillation, the moving average filter will obviously suppress the overshoot oscillation, but it will also reduce the systems response speed and measurement bandwidth. Finally, a frequency response test platform was built, and the frequency response characteristics of the sensor were tested under different forward gains and filter orders, the non-reciprocal step phase difference was introduced based on the phase modulation principle of the sensor, and the equivalent test of the step response was achieved. The test results of frequency response characteristics and step response characteristics are in good agreement with the simulation results, which proves the accuracy of the model.
		2021 Vol. 42 (6): 785-792 [Abstract] ( 247 ) HTML (1 KB) PDF (2370 KB) ( 234 )

	793	The Core Algorithm and Experimental Research of Antenna Gain Measurement by Extrapolation
		CHEN Jun, SONG Zhen-fei, WAN Fa-yu
		DOI: 10.3969/j.issn.1000-1158.2021.06.16
		Based on the principle of extrapolation method, the core algorithm of extrapolation antenna gain measurement is studied. The innovation lies in the design of antenna mutual coupling suppression filtering, fitting of power series expansion and impedance mismatch correction, and the antenna gain calculation at any distance. In addition, an operation interface of extrapolation antenna gain measurement is designed basing the above core algorithm for antenna gain measurement convenience. Finally,The gain calibration experiment of W-band standard antenna is carried out, the gain measurement deviation is less than 0.04 dB with the NPL measurement, which achieves good equivalent consistency.
		2021 Vol. 42 (6): 793-798 [Abstract] ( 298 ) HTML (1 KB) PDF (2057 KB) ( 498 )

	799	Adaptive Signal Fusion Algorithm Based on Relative Fluctuation
		PAN Zuo-zhou, MENG Zong, ZHANG Guang-ya, SHI Ying, FAN Feng-jie
		DOI: 10.3969/j.issn.1000-1158.2021.06.17
		An improved adaptive random weighting algorithm was proposed to solve the problem that in the traditional random weighting algorithm, when the target signal is variable, the total mean square error is much larger than the constant signal. In order to make the estimated value closer to the true value, the mentioned algorithm used the relative fluctuation value of the collected signal to adaptively adjust the proportional relationship between the currently acquired signal and the historically acquired signal. Since the relative fluctuation value can be adjusted autonomously according to the signal variation, it can be well combined with the traditional random weighting algorithm. The effectiveness of the proposed fusion method had been demonstrated by numerical simulations.
		2021 Vol. 42 (6): 799-805 [Abstract] ( 252 ) HTML (1 KB) PDF (2410 KB) ( 515 )

	806	Calibration of Silicon Photodiode Detector on Low Energy X-ray Radiation Fields
		HUANG Lin-ru, YAO Xin-bo, WANG Ji, CHEN Can, SUN Jian,GUO Si-ming, GUO Xiao-wei, ZHANG Xiao-gai, XU Hong-wei
		DOI: 10.3969/j.issn.1000-1158.2021.06.18
		Before calibrating synchrotron radiation X-ray energy, the silicon photodiode as a transfer detector needs to be calibrated. Using a low energy from 10 kV to 50 kV X-ray air kerma reference device to study the radiation response of silicon photodiodes, then use it to measure uniform radiation field range. As a transmission detector, the AXUV-100G has a high energy response in the energy range from 10 keV to 40 keV placing in the low energy X-ray reference radiation field. The uncertainty of reproducing air kerma is 0.57% in all radiative conditions.The diameter of visual field with an uniformity better than 99% of AXUV-100G at a distance of 1 m from the focal spot of the X-ray machine is about 61 mm, and better than 95% is 96 mm, which meets the requirements of secondary transmission standard value reproduction and transmission.
		2021 Vol. 42 (6): 806-810 [Abstract] ( 237 ) HTML (1 KB) PDF (1155 KB) ( 300 )

	811	Initial Exploration of Half-value Layer Determination Using Thermoluminescent Dosimeter
		HAO Yan-mei,Lü Ya-zhu,LI De-hong,LIU Huan,LI Tao
		DOI: 10.3969/j.issn.1000-1158.2021.06.19
		A simple and effective method of the half-value layer (HVL) measurement becomes more and more important increase with the number of X-ray equipment. Penelope was used to simulate the energy deposition of LiF(Mg, Cu, P) thermoluminescence dosimeters in N80 (65 keV), N100 (83 keV), N150 (118 keV), N200 (164 keV) heavy filtered narrow-spectrum irradiation fields with different copper thickness, the HVL of X-ray machine was obtained by analysis and calculation, the HVL of LiF X-ray machine with narrow spectrum standard irradiation field of N100 (83 keV) at 3 m was measured experimentally to verify the simulation program. The results showed that for the low energy N80 (65 keV), N100 (83 keV) irradiation field, LiF dosimeter is feasible to measure the half value layer of X-ray, it was not recommended to use the thermoluminescence to measure the half-value layer in N150 (118 keV), N200 (164 keV) irradiation field, because of the simulation results have large relative errors with the values obtained by the ionization method.
		2021 Vol. 42 (6): 811-814 [Abstract] ( 245 ) HTML (1 KB) PDF (1042 KB) ( 219 )

	815	The Purity Value and Uncertainty Analysis of a Fuel Heat Sink Reference Material Candidate
		WANG Zhi-xuan, XU Qiang, DU Yong-mei, LI Chun-ying, SUN Dao-an,LI Jiao-yi, ZHANG Gao, Lü JianWANG Zhi-xuan, XU Qiang, DU Yong-mei, LI Chun-ying, SUN Dao-an,LI Jiao-yi, ZHANG Gao, Lü Jian
		DOI: 10.3969/j.issn.1000-1158.2021.06.20
		A kind of polycyclic hydrocarbon compound can be used as a candidate of fuel heat sink reference material for hypersonic aircrafts, which is of great significance on heat sink measurement. Two different methods, mass balance and quantitative nuclear magnetic resonance approaches were adopted to characterize the purity of the candidate. Moreover, main uncertainty contributions were analyzed, and then the uncertainty of the purity of the candidate was evaluated. In the process of purity valuation, GC-FID was used to test the homogeneity and stability of the subpackage samples. The results showed that the candidate has a good homogeneity, and can store for at least one year under normal storage conditions (20 ℃, 101.325 kPa). The purity of the candidate is 99.42% with the expanded uncertainty of 0.84% (k=2).
		2021 Vol. 42 (6): 815-821 [Abstract] ( 199 ) HTML (1 KB) PDF (682 KB) ( 207 )

	822	Determination of Nickel Content in Crude Oil by ICP-AES and Evaluation of Uncertainty
		WANG Peng, ZHAO Rong-lin, LING Feng-xiang, WANG Shao-jun
		DOI: 10.3969/j.issn.1000-1158.2021.06.21
		The content of nickel in crude oil was quantitatively analyzed by inductively coupled plasma emission spectrometry (ICP-AES), and the uncertainty analysis method was established. The contribution of uncertainty component was evaluated from four aspects, and its relative standard uncertainties were calculated respectively. Finally, the synthetic standard uncertainty and expanded uncertainty were obtained. Through analysis and calculation, the expanded uncertainty is 0.20 mg/kg (k=2) when the content of nickel in crude oil is 19.64 mg/kg. The results show that the mainly uncertainty influence factor is introduced by standard curve fitting and standard material itself, followed by solution preparation, while the contribution of sample weighing and measurement repeatability is small.
		2021 Vol. 42 (6): 822-827 [Abstract] ( 288 ) HTML (1 KB) PDF (830 KB) ( 231 )

	828	Method of CRP Rapid Analyzer Based on Formazine Polymer
		ZHANG Yi-wen, ZHAO Xu, WANG Jun, WEI Yong-hao, MA Kang,WU Hong, ZHAO Hai-bo
		DOI: 10.3969/j.issn.1000-1158.2021.06.22
		C-reactive protein (CRP) rapid analyzer is one of the commonly used rapid testing instruments in primary medical institutions. At present, there are no relevant regulations and specifications for traceability and reliability of this type of instrument. By analyzing the molecular size and molecular weight distribution of formazine solution and C-reactive protein solution, the instrument was tested on the basis of scattering principle and referring to the method items of JJG 880—2006 turbidimeter, and the rationality of the method was evaluated. Quikread101 (Rate Scattering) CRP rapid analyzer from Orion manufacturer was used in the experiment. The results showed that the linearity and repeatability of the determination were good when the formazine solution series was tested in turbidity range of (675~1 000) NTU. By comparing a series of formazine solutions with the series of C-reactive protein solutions, the corresponding turbidity values of formazine solutions were found, which provided a reference method for tracing the values of these instruments.
		2021 Vol. 42 (6): 828-832 [Abstract] ( 250 ) HTML (1 KB) PDF (1096 KB) ( 163 )

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