Abstract:

This paper briefly introduces the measuring principle and structure of the liquid level standard device, which is based on the double-frequency laser interferometer equipment for measuring the liquid level. An uncertainty evaluation mathematical model for the liquid level standard device has been established. In the studies, various uncertainty affecting the liquid level standard device were analyzed. Based on this, the uncertainty components of different influence factors were calculated. The results show that the uncertainty value of the liquid level standard device was 0.045 588 mm, and the expanded uncertainty was 0.091 176 mm.

Key words: Liquid level standard device, Influence factor, Uncertainty, Dual-frequency laser interferometer, The expanded uncertainty

摘要： 介绍了以双频激光干涉仪为测量设备的液位标准装置的测量原理及结构, 建立了液位标准装置的不
确定度数学模型, 对影响液位标准装置的各种不确定度来源进行了分析, 在此基础上计算出各影响因素的不确定度
分量, 最后计算得到液位标准装置的测量不确定度为0. 0 4 55 8 8mm, 扩展不确定度为0. 0 9 11 7 6mm

关键词:  液位标准装置, 影响因素, 不确定度, 双频激光干涉仪,  , 扩展不确定度