Characterising the Positioning System of a Dimensional Computed Tomograph (CT)

Benjamin A. Bircher, Felix Meli, Alain Küng & Rudolf Thalmann
Computed tomography (CT) is increasingly used for dimensional characterisation of workpieces. Therefore, the Federal Institute of Metrology METAS is developing and building a unique metrology CT system to measure workpieces of millimetre dimensions with sub-micrometre resolution, and to study CT metrology and traceability in general. Here, an overview of the CT system is presented and the requirements related to the positioning system and its characterisation are discussed in detail. The results indicate that further in...
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