测长机直接比较测量误差和测量不确定度分析

The Measurement Error of Direct Comparison and Measurement Un certainty of Length Measurement Machine

测长机用于大型精密工件和量具的长度、外径、内径的测量,有直接比较测量和微差比较测量两种测量方法。采取直接比较测量方法可以充分发挥测长机功能,减少测量成本,提高测量效率。对测长机直接比较测量的误差来源和测量不确定度进行分析,并对测长机测量方法的选择提出建议。

The length measuring machines are used to measure the length,outer diameter,and inner diameter of large precision work-pieces and measuring tools.There are two measurement methods,which are direct comparison measurement and differential comparison measurement.The direct comparative measurement method can give the full play to the function of the length measuring machine,reduce the measurement costs,and improve the measurement efficiency.This article analyzes the error source and measurement uncertainty of the direct comparison method of the length measuring machine,and make suggestions on the selection of the measuring methods for length measuring machine.