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| Uncertainty Analysis of Velocity Measurement in Low Pressure Flow Field |
| YANG Tie-niu1,2,ZOU Sheng1,2,WU Zong-yue1,2,ZHAO Lei-lei1,2,LU Dong-dong1,2,YANG Ya1,2 |
1.School of Mechanical and Electrical Engineering, Wuyi University, Jiangmen, Guangdong 529020, China
2.Jiangmen CAD/CAM Engineering and Technology Research and Development Center, Jiangmen, Guangdong 529020, China |
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Abstract Laser Doppler velocimetry has been widely used in the field of flow measurement. Based on the experimental platform of vacuum airflow detection, a laser Doppler velocimeter was used to measure the gas-velocity of the vacuum chamber. In order to reduce the measurement error of the velocity measurement system, the source and evaluation of the measurement uncertainty of the vacuum chamber velocity were analyzed and explained. The relative standard uncertainty and the relative expansion uncertainty of the measurement of gas-velocity of the vacuum chamber are obtained. The results show that the uncertainty caused by LDV repetitive velocity measurement and air intake quantity estimation is relatively large, but the uncertainty caused by LDV system error and other factors are smaller. The results are of guiding significance to the measurement of flow velocity in the later stage of vacuum chamber.
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Received: 12 March 2018
Published: 07 March 2019
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2019, Vol. 40 
