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磁致伸缩液位计安装垂直度对测量误差影响

  磁致伸缩液位计在校准装置上安装的垂直度对整个校准过程的测量误度有很大影响,理论上调平后浮子应沿垂直于水平面的铅垂线方向上下运行,实际安装固定后液位计轴向相对于铅垂线的夹角(如图4所示)会导致测量结果产生误差。

磁致伸缩液位计轴向与铅垂线的夹角图
磁致伸缩液位计轴向与铅垂线的夹角图

  尽管机械装配精度、水平调整人为操作、光栅尺安装位置等因素依然会带来误差,但考虑到这些误差相对较小,有些可以通过补偿方式进行计算,因此在考虑夹角问题时,假定其他参量均为理想数值。设此时液位计轴向与铅垂线的夹角为θ。

  产生的偏移量S和处于测量范围内的量程H与实际量程L的关系为

  S=L*sinθ

  H=L*cosθ

  当量程为最大值2 m时,最大偏移量小于等于20 mm,即

  S=L*sinθ=20.02mm

  经过计算θ≈0.57°,对于0〜2 m量程范围内的磁致伸缩液位计而言,实际量程L=2000 mm,因此可以计算出处于测量范围内的量程

  H=2000mm*cos0.5°=1.999.9mm

  由计算公式可知,校准装置此时的最大偏差为0.1 mm。

  对于0~2m量程范围内的磁致伸缩液位计而言,由于顶部液位计夹持装置结合端面机械配合带来的偏差角小于0.3°,因而依靠其自身重即可保证铅垂线夹角在要求范围内。但为进一步提高测量精度,避免因人工安装产生的误差问题,使用底部液位计夹持装置对磁致伸缩液位计尾端进行固定,该装置可沿底部直线导轨上下移动,适应夹持磁致伸缩液位计的尾端。

  采用双基准面对准法对上下两个夹持装置进行对准,使二者处于同一铅垂轴向上,即控制了磁致伸缩液位计轴向与铅垂线的夹角。机械对准偏差按+1mm计算,可得出此时

  θ = arcsin( S/L) = arcsin( 2/2000)≈0.057°

  H=L* cosθ≈1999.999 mm

  此时由安装垂直度带来的偏差为0.001mm。