摘要
立足于接触式低温液位传感器的校准需求,设计并研制了液位传感器动态校准装置,以实现在常温及低温条件下对测量范围为1 800 mm、极限误差为±2 mm的电容式传感器的校准。采用齐次坐标变换原理,从导轨直线度误差、定位误差、各连结链空间角度误差、液面波动误差等方面入手,建立了低温液位传感器校准装置的几何误差模型。对低温液位传感器校准装置的测量不确定度进行了评定,结果表明:扩展不确定度为U=0.53 mm(k=2),满足低温液位传感器的校准精度要求。
Based on the need of calibrating the liquid level sensor,dynamic calibration device was designed and developed for liquid level sensor which applied to capacitive sensors（ measuring range is 1 800 mm,and limiting error is ± 2 mm） in both normal and low temperature conditions. The principle of homogeneous coordinate transformation was used to establish geometric error model for the calibration device,which mainly contained the rail straightness error,positioning error,spatial angle error of each chain and level fluctuation error,and other aspects. Moreover,the uncertainty of calibration device was evaluated. The results show that the expanded uncertainty is U = 0. 53 mm（ k = 2）,which meets the specifications of calibration accuracy of the cryogenic liquid level sensor.
出处
《机床与液压》
北大核心
2016年第17期105-111,共7页
Machine Tool & Hydraulics
基金
国防科工局技术基础"十二五"科研项目(科工技【2011】8XX)
