UNCERTAINTY ANALYSIS OF A LASER CALIBRATION SYSTEM USING GUM AND AN ALTERNATIVE METHOD Heber Ferreira Franco de Castro
Resumo: A laser calibration system for evaluating the positioning accuracy of machine tools and coordinate measuring machines (CMM) under dynamic conditions has been developed. It is based on the Hewlett Packard (nowadays, "Agilent Technologies") 5529A laser interferometer that is capable of performing dynamic calibration. This paper deals with the evaluation of the measurement uncertainty of this laser calibration system using two methodologies. In order to assess the measurement uncertainty of this laser system, an analysis of the uncertainty components that make up the uncertainty budget of this laser system has been carried out. Two methods are used for evaluating the measurement uncertainty of this laser calibration system. The first method is based on GUM ("Guide to the Expression of Uncertainty in Measurement") and the second one is an alternative method. This uncertainty analysis was carried out when this laser calibration system was used to assess the positional errors of a moving bridge type CMM.
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