激光小角度基准测量不确定度评定

基于透明箱模型采用蒙特卡洛法进行了激光小角度测量系统的不确定度评定。 根据测量原理建立了测量不确定度评定模型,分析各不确定度来源。 重点分析了初始零位角和被测角度大小对测量不确定度的影响,分析结果表明:当被测角度较小时,测量不确定度主要受随机误差的影响;随着被测角度的增大,测量不确定度逐渐增大;当未对初始零位角进行精确调整时,测量不确定度不再服从正态分布,其影响随着被测角度的增大而增大。

Measurement Uncertainty Evaluation for the Laser Small Angle Primary Standard

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.