中文摘要：

针对超声波流量计干标中＂由于测量工具和计算方法选用不当,使得几何尺寸标定准确度下降＂的问题,从测量工具和相关性的角度出发,选用内径千分尺测量了超声波流量计的声道长度、内径以及声道角,并分别计算了这3个因素的相对不确定度,最后对比了仅考虑测量重复度时计算几何尺寸总的相对误差为0.067%,考虑测量工具和相关性后总的相对误差为0.070%,得出了测量工具和测量相关性是影响几何尺寸标定准确度的重要因素。研究结果表明,该方法可以提高超声波流量计干标的准确度。

英文摘要：

Aiming at this problem that the measuring tool and calculation method improper selection reduce geometric size calibration accuracy in dry calibration of ultrasonic flowmeter,the internal diameter micrometer was choosen to measure the channel length,diameter and channel angle of ultrasonic flowmeter from the angle of measuring tools and correlation.And it was calculated respectively the three factors of the relative uncertainty.Finally,it was compared with calculating relative error of 0.067% when only considering the measurement repeatability,and it’s 0.070% when considering the measurement tools and correlation.So a conclusion was gotten that the measurement tools and measuring correlation were important factors affecting the geometry calibration accuracy.The results indicate that this method can improve the certainty for dry calibration.