J1610102 Development of a New Calibration System for Reducing Measurement Uncertainty of Laser Velocimetry

2014 ◽  
Vol 2014 (0) ◽  
pp. _J1610102--_J1610102-
Author(s):  
Katsuaki SHIRAI ◽  
Shohei ISHIMURA ◽  
Tsuyoshi KAWANAMI ◽  
Shigeki HIRASAWA
Keyword(s):  
Measurement Uncertainty ◽  
Calibration System ◽  
Laser Velocimetry

Study on Uncertainty of Gas Monitoring Dynamic Calibration System

2011 ◽  
Vol 105-107 ◽  
pp. 1970-1974 ◽  
Author(s):  
Li De Fang ◽  
Xiu Ming Xiang ◽  
Xiao Ting Li ◽  
Li Li Pang ◽  
Xiao Jie Wang ◽  
...  
Keyword(s):  
Air Pollution ◽  
Air Quality ◽  
Measurement Uncertainty ◽  
Monitoring System ◽  
Rapid Development ◽  
Measurement Model ◽  
Quality Monitoring ◽  
Dynamic Calibration ◽  
Air Quality Monitoring ◽  
Calibration System

With the rapid development of industry and transportation, air pollution is worsening, therefore, monitoring of air pollution components is more and more heeded. In this study, based on the measurement model and the composition of the air quality monitoring system on line, the mathematical model of the measurement system value transmission was analyzed, and the uncertainty components were calculated respectively, a conclusion that the main factor of the overall system uncertainty is the uncertainty of system itself in the existing air quality monitoring system was drawn, so measurement uncertainty of the calibration system was focused on the research. The effects of the Zero-gas, calibration gases and gas mass flow controller on the uncertainty of the calibration system was experimented and analyzed, and measurement uncertainty of the dynamic calibration system was evaluated.

scholarly journals Research on an alternative LS2P microphone based on a new reciprocity calibration system

2019 ◽  
Author(s):  
Maria Enge ◽  
Christian Hof ◽  
Salvador Barrera-Figueroa
Keyword(s):  
Measurement Uncertainty ◽  
Calibration System ◽  
Research Results ◽  
National Metrology Institutes ◽  
Laboratory Reference ◽  
Reciprocity Calibration ◽  
The Stability ◽  
Comparison Measurements

The microphone calibration by the reciprocity technique specified in IEC 61094-2 is used to determine the sensitivity of laboratory standard microphones according to the IEC 61094-1 with the smallest measurement uncertainty for the use as reference microphones. So far, laboratory standard microphones by the manufacturer Brüel & Kjær (Type 4160 and Type 4180) are almost exclusively used as laboratory reference microphones. In order to create an alternative, the initiative has been taken to examine the usability of the ½-inch laboratory microphones G.R.A.S. 40AU-1. Studies were launched to check the microphone parameters, the stability and the reciprocity of the microphones as well as the compatibility with microphones by Brüel & Kjær. Basis for the investigation was a new validated reciprocity calibration system. The realization of the system and the research results are presented and discussed. Additionally, results of comparison measurements with national metrology institutes are shown in shortened fashion.

National primary standard machine of Shore D hardness scale for metals and Leeb hardness scales

2020 ◽  
pp. 6-10
Author(s):  
A.E. Aslanyan ◽  
E.G. Aslanyan ◽  
S.M. Gavrilkin ◽  
A.S. Doynikov ◽  
A.N. Shchipunov
Keyword(s):  
Measurement Uncertainty ◽  
Primary Standard ◽  
Metrological Characteristics ◽  
National Primary Standard ◽  
Hardness Scale ◽  
Leeb Hardness

The article presents the results of studies to improve the National primary standard machine for hardness of metals on the shore D scale GET 161-2001, which were performed in FSUE “VNIIFTRI” from 2016 to 2018 in accordance with the technical task of Rosstandart.The improvement was carried out in order to ensure the uniformity of hardness measurements on the Leeb scales. The created new parts of the primary standard machine, which are settings for reproducing hardness numbers on the Leeb scales, are considered. Metrological characteristics of the upgraded and adopted National primary standard machine (GET 161-2019) were investigated, the budget of measurement uncertainty was calculated for reproducing hardness numbers on the Leeb scales.

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