Industrial computer tomography for dimensional metrology: Overview of influence factors and improvement strategies

摘要

While Computer Tomography (CT) has since long been used for medical applications and material inspection, its application field has recently been broadened to include dimensional metrology in industry. In particular, it provides a unique means of measuring assemblies, complex structures as well as the inner geometry of parts made by rapid manufacturing in a non-destructive way. However, the accuracy of CT-based measurements remains yet largely uncertain, due to a number of influencing factors related to the workpiece, the CT equipment as well as the measurement setup. This paper first classifies the factors influencing the CT performance on the basis of the basic components of the CT system. Next, the obtained knowledge is used to suggest improvement strategies to ameliorate the accuracy of CT measurements.