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Vol. 67, No. 7 07 2023
monthly CN 10-1696/TB ISSN 2096-9015
Articles in press have been peer-reviewed and accepted, which are not yet assigned to volumes /issues, but are citable by Digital Object Identifier (DOI).
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The simple and effective detection operation content for grassroots biosafety cabinet users was optimized to guide inspections during use, considering the performance differences of different types of Class II biosafety cabinets and complex metrological operations. During verification, the simplest operations can be performed to ensure normal instrument performance. In the experiment, the measurement characteristics detection method of the biosafety cabinet was optimized and compared with standard test results to analyze the feasibility of the optimized method. The results demonstrate that cleanliness detection is simplified into four points, light intensity detection into five equal points, noise detection is optimized to two points closer to actual human ear-received noise levels. Descending wind speed is simplified using a three-point method while inflow wind speed is simplified using six points at an angle set as 45°. Smoke position preferably near the fan. The results from this optimization closely align with measurement characteristics tested according to standards for biosafety cabinets. This optimized detection method satisfies frontline users in quickly understanding current cabinet performance, laying a foundation for research on measurement characteristics of biosafety cabinets, timely identification of biohazards, and prevention of laboratory biological accidents.
To ensure the accuracy and reliability of the voltage and current measurement system for shock testing, this study investigates and quantifies the impact of digital data recorders on shock measurement results, the influence of the selection of measurement range on the measurement results, and the evaluation of the performance of digital data recorders in the system. The calibration methods and procedures for shock-specific digital data recorders are introduced, along with the principles of calibration, and the technical specifications and feasibility of calibration devices are discussed. An experimental plan is proposed to assess the influence of measurement range selection on digital data recorders, and experiments are conducted using the commercial high-precision digital data recorders PXI-5124, PXIe-5164, and PXIe-5172. The experimental results demonstrate a regular pattern of the impact of measurement range on measurement error: for the same voltage, digital data recorders with larger measurement ranges exhibit larger peak errors and smaller time parameter errors. The study analyzes and identifies the optimal measurement ranges for the three digital data recorders in peak and time parameter measurements. Additionally, a method for calculating the uncertainty of the digital data recorders is provided. Under the 0.84/60 waveform, the uncertainty assessment for the PXIe-5164 at a 10V range yields the following results (expanded uncertainty, k=2): Ut = 0.15%, T1 = 2.1%, T2 = 0.51%. This study substantially evaluates the performance and measurement characteristics of digital data recorders, assesses their contribution to uncertainty values in the shock measurement system, and enhances the theoretical and practical requirements of the shock measurement system.
[Abstract] To improve the digital level of equipment management, save laboratory management costs, establish a laboratory equipment fault prediction model, and effectively utilize equipment fault data. Selected the operational fault data of force-value equipment as the analysis object, conducted a correlation analysis of each influencing quantity based on statistical methods, and used RidgeCV, XGBoost, and LightGBM three regression models to fit the data set, comparing and selecting the appropriate algorithm to predict the first fault time before the equipment. Using r2, mean squared error, explained variance, and mean absolute error as measures of model accuracy, the optimized LightGBM algorithm after grid search and cross-validation had the best prediction accuracy and running speed. The most important features for determining the first fault time were the equipment service time and the original value of the equipment. Through effective coordination of equipment fault data and combined with big data analysis technology, it is possible to establish a fault prediction model for different types of equipment that conforms to its own laws, exploring a way to improve laboratory management quality and efficiency.
Existing on-board positioning terminals has the problems of large positioning errors and slow updating speed. The influencing factors of the positioning error of the vehicle terminal are analyzed, and the method of correcting the positioning error of the vehicle terminal based on BP neural network and lagged variable regression is proposed. The positioning errors of the vehicle terminal before and after correction of three measurements are compared. The maximum positioning errors are reduced by 88.2%、85.4% and 85.8%, respectively. The positioning errors of the vehicle terminal before and after correction are compared to the measured data, which proves the positioning error model of the vehicle terminal established by BP neural network and lagged variable regression is effective.
The Evaluation Method and Application Research of Measurement Uncertainty
JIN Haoyuan, LIU Jun
2021, 65(5): 124-131.   doi: 10.12338/j.issn.2096-9015.2020.9002
[Abstract](2015) [FullText HTML](953) [PDF 655KB](758)
Application of Digital Twins in Medical and Health Fields and Related Research Progress
CHEN Yuefei, WANG Sisi, TIAN Mingqi, CHEN Chuan
2021, 65(10): 6-9.   doi: 10.12338/j.issn.2096-9015.2021.0050
[Abstract](1535) [FullText HTML](1144) [PDF 540KB](321)
The Metrology Technology of Medical Wearable Physiological Parameter Monitoring Equipment
ZHOU Feng, DING Xiang
2021, 65(8): 7-10.   doi: 10.12338/j.issn.2096-9015.2020.9056
[Abstract](521) [FullText HTML](276) [PDF 534KB](81)
Analysis of an Electrochemical Gas Sensor for Measuring Carbon Monoxide
LI Guangyi
2021, 65(3): 40-43.   doi: 10.3969/j.issn.2096-9015.2021.03.08
[Abstract](534) [FullText HTML](310) [PDF 782KB](34)
Research on Split Test Method of Low-Pressure High-Flow Thermal Gas Mass Flowmeter
Joseph W.F. Lai, LING Guangsheng, ZHAO Hao, ZHANG Fuyuan, XIE Dailiang, XU Ya
2022, 66(8): 3-6, 12.   doi: 10.12338/j.issn.2096-9015.2021.0215
[Abstract](475) [FullText HTML](140) [PDF 1332KB](17)
热式气体质量流量计具有量程比大、精度高以及可靠性好等优点,可广泛应用于工业天然气、家用煤气以及医疗中氧气等气体流量的测量,在工业以及民用领域中有着广阔的应用前景。目前国内市场上低压天然气实流测试标准装置的最大测试流量通常只能达到40 m3·h−1,无法对低压大流量气体质量流量计进行实流测试,给生产上带来很多不便。本文利用分流组件对热式气体质量流量计进行改装,通过数值模拟对分流组件与整表的流场特性进行了对比验证。采用实流测试设备对该分流组件进行实流测试,利用计算获得的流量比例系数获得流量计整表的流量性能,从而解决了低压天然气大流量气体质量流量计的实流测试问题。
Recent Prospects on Some Problems in Inertial Technology Metrology
YE Wen, CAI Chenguang, YANG Ping, QUAN Wei, XING Li, HU Ruo
2021, 65(3): 9-14, 52.   doi: 10.3969/j.issn.2096-9015.2021.03.02
[Abstract](578) [FullText HTML](327) [PDF 623KB](107)
惯性技术是研究运载体运动信息(位置、速度、姿态等)的获取与感知技术,是一个国家科学技术水平和国防实力的核心标志之一。在国防和国民经济建设重大需求的牵引下,惯性技术一直备受各国的高度重视,属于基础性、战略性和前沿性的军民两用高新技术。在惯性技术中,陀螺仪是测量运载体角速度的核心仪表,是运载体进行姿态调整/控制、实现自主/隐蔽导航的核心信息源之一, 其发展呈高精度和微型化两种趋势。本文总结梳理了惯性技术的发展动态和研究现状, 重点强调了陀螺仪的发展现状及惯性测试计量研究内容, 展望了新SI时代的原子惯性计量。
Research on the Importance and Development in the Digital Era of Metrology and Measurement
DOU Chen, ZHOU Zili
2022, 66(9): 70-73.   doi: 10.12338/j.issn.2096-9015.2022.0168
[Abstract](356) [FullText HTML](131) [PDF 507KB](97)
Research Progress on Common Measurement Methods of Nucleic Acid Reference Materials
CHEN Guifang, OUYANG Yanyan, YANG Jiayi, GAO Yunhua
2021, 65(6): 25-33.   doi: 10.12338/j.issn.2096-9015.2020.9022
[Abstract](657) [FullText HTML](429) [PDF 1030KB](169)
Discussion on Uncertainty Evaluation and Applicable Conditions of Univariate Linear Calibration Curve
WANG Bin, LU Xiaohua
2022, 66(7): 45-49, 44.   doi: 10.12338/j.issn.2096-9015.2021.0636
[Abstract](305) [FullText HTML](94) [PDF 730KB](65)
Application of Measurement Verification Technology in Performance Evaluation of Gas Ultrasonic Measurement System
WANG Hui, LIU Dingfa, ZHANG Qiang
2021, 65(4): 68-73, 77.   doi: 10.3969/j.issn.2096-9015.2021.04.15
[Abstract](389) [FullText HTML](202) [PDF 435KB](54)
The Evaluation Method and Application Research of Measurement Uncertainty
JIN Haoyuan, LIU Jun
2021, 65(5): 124-131.   doi: 10.12338/j.issn.2096-9015.2020.9002
[Abstract](2015) [FullText HTML](953) [PDF 655KB](953)
In this paper, the development history of measurement uncertainty, the current research status at home and abroad, and the possible future development directions are mainly introduced. The seven main evaluation algorithms are introduced and summarized, and the current situation of the application of measurement uncertainty in different fields is investigated and summarized. Finally, the applicable scenarios of different evaluation algorithms are summarized, and the possible future development directions of measurement uncertainty are discussed.
2021, (1).  
[Abstract](372) [PDF 56727KB](71)