Estimation of measurement uncertainty in an automated flowmeter calibration system

2021 ◽  
Vol 9 (2C) ◽  
Author(s):  
Idrissa Deme
2011 ◽  
Vol 105-107 ◽  
pp. 1970-1974 ◽  
Author(s):  
Li De Fang ◽  
Xiu Ming Xiang ◽  
Xiao Ting Li ◽  
Li Li Pang ◽  
Xiao Jie Wang ◽  
...  

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.


2014 ◽  
Vol 17 (4) ◽  
pp. 5-10
Author(s):  
Dong-Keun Lee ◽  
Jong-Seob Kim ◽  
Tae-Jin Park ◽  
Jong-Ho Park

Author(s):  
Maria Enge ◽  
Christian Hof ◽  
Salvador Barrera-Figueroa

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.


2014 ◽  
Vol 2014 (0) ◽  
pp. _J1610102--_J1610102-
Author(s):  
Katsuaki SHIRAI ◽  
Shohei ISHIMURA ◽  
Tsuyoshi KAWANAMI ◽  
Shigeki HIRASAWA

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