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磁致伸缩液位计校准装置不确定度

  不确定度计算

  本装置主要针对量程范围为0~2 m,测量误差范围为+1 mm的磁致伸缩液位计进行相关校准工作。其误差来源主要有以下几方面:光栅尺测量精度引人误差、阿贝误差、液位计安装垂直度误差、平台调平误差、液位计测量重复性和分辨力带来的误差,以及来自现场环境的其它误差。不确定度分量计算如下:

  1)光栅尺精度不确定度分量

  光栅尺本身的测量精度为15 μm,按均匀分布计算其不确定度分量

  U1=15um/√3≈0.009 mm

  2)阿贝误差引起的不确定度分量

  由磁致伸缩液位计安装位置产生的阿贝误差为0.05 mm, 按均匀分布计算其不确定度分量

  U2=0.05mm/√3≈0.029 mm

  3)安装垂直度误差不确定度分量

  通过调整顶部和底部的夹持装置控制液位计本身的安装垂直度误差,计算其不确定度分量时予以适当放大,按0.04 mm且均匀分布计算其不确定度分量

  U3=0.04mm/√3≈0.023 mm

  4)平台调平误差不确定度分量

  采用水平仪调平误差为±2.2°,换算成液位计测量误差为0.003 mm,按均匀分布计算其不确定度分量

  U4=0.03mm/√3≈0.020 mm

  5)磁致伸缩液位计测量重复性不确定度分量⑼

  液位计本身的重复性为2.022% ,其不确定度分量

  u5= 0.001% *2000 mm =0.020mm

  6) 液位计分辨力不确定度分量

  由于光栅尺分辨力较高,可忽略其影响,考虑液位计本身的分辨力为0.24 mm,按均匀分布计算其不确定度分量

  u6= 0.04mm*0.29 =0.012mm

  7) 其它误差不确定度分量

  来自现场环境的冲击振动、磁场等因素带来的误差,设为±0.1mm,按均匀分布计算其不确定度分量

  U7=0.1mm/√3≈0.058mm

  考虑到已对温湿度进行补偿,因而温湿度导致的不确定度分量忽略不计。