炮管内径测量仪校准装置研究及不确定度分析

Research on calibration device for barrel’s inner diameter instruments and uncertainty analysis

针对炮管内径测量仪的校准溯源问题,阐述了炮管内径测量仪的结构原理,设计了一种具有双动测头的校准装置,建立了测量模型,分析了影响校准结果的主要因素,并对各因素的影响程度进行了定量评估,最后评定出测量不确定度。结果表明,校准装置的不确定度为0.22μm,测径仪校准结果的不确定度为3.0μm,能够满足内径测量仪的校准溯源要求,并实现了自动化校准。

Aiming at the calibration traceability problem of barrel’s inner diameter instrument,the structure principle of barrel’s inner diameter instrument is expounded.The principle and composition of calibration device with double dynamic measuring heads is designed.The measuring model is founded.The main factors affecting calibration result are analyzed and the affection by each factor is evaluated.Finally,the uncertainty is presented.The results show that the uncertainty of calibration device is 0.43μm,the calibration result’s uncertainty of inner diameter instrument is 2.9μm.The calibration traceability requirements can be meet and the automatic calibration is realized.