高精度标准表法标准装置研究

Standard facilities with high precision using master meter method

为解决受标准表本身线性度影响,使得标准表法标准装置的扩展不确定度较高的问题,将通过流压缩量计测量范围来提高流量计精度的技术应用到标准表法标准装置中。开展了影响涡街流量计精度因素的分析,建立了流量计线性度和标准装置不确定度之间的关系。提出了通过压缩流量计来提高标准表精度,来减小标准装置的扩展不确定度的方法。对流量计量程压缩前、后的标准装置的扩展不确定度进行了评价,进行了模拟实验。研究结果表明,通过压缩流量计量程和优化组合能够降低标准装置的扩展不确定度。

In order to solve the problem of the standard facilities with high expanded uncertainty which affected by the linearity of the standard flowmeter itself,the improvement of flow meter accuracy by compressing measurement range was investigated after the analysis of the effect of the accuracy of vortex flowmeter,the relationship between the linearity of the standard flowmeters and the expanded uncertainty of the standard facilities was established. A method was presented to reduce the expanded uncertainty of the standard facilities. The expanded uncertainty of the standard facilities were evaluated on the theoretical calculation,the efficacy were tested. The experimental results show that we can reduce the expanded uncertainty of the standard facilities by compressing measurement range and combination optimization.