Measurement Uncertainty Evaluation for the Laser Small Angle Primary Standard
WANG Han-bin1,HUANG Yao2,XUE Zi2,HOU Jia2,3,WANG Chao-yang1
1. Fujian Metrology Institute, Fuzhou, Fujian 350003, China
2. National Institute of Metrology, Beijing 100029, China
3. China Jiliang University, Hangzhou, Zhejiang 310018, China
Abstract：Based on transparent box model, using the Monte Carlo method, the measurement uncertainty of the laser small angle measurement system was evaluated. According to the measuring principle, the evaluation model for the measurement uncertainty was built, the sources of uncertainty were analyzed. The influence of the zero-angle positionand the measured angle on the measurement uncertainty was emphatically analyzed. The analysis results show that the measurement uncertainty is mainly affected by the random error when the measured angle is small. The measurement uncertainty increases with the increasing of the measured angle. When the zero-angle position is not accurately adjusted, the measurement uncertainty is no longer subject to the normal distribution, and its influence increases with the increase of the measured angle.
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2019, Vol. 40 
