Performance Study of Non-Contact Surface Measurement Technology for use in an Experimental Fusion Device

摘要

Upgrade of the EFDA-JET experimental fusion device has generated interest in remote non-contact surface measurement of protective metallic tile surfaces inside the machine during shutdown periods. The measurement of gap and step features of 0.35-2mm and 0.04-0.2mm respectively, deposition and erosion on planar facets and the form of the complete vessel required specific testing to understand if existing systems could meet project requirements. This paper describes investigations against planar facets posed at differing angles to both fringe projection and tracked laser triangulation non-contact measurement technologies. System capabilities demonstrate typical plane fitting capabilities of the order of 20μm RMS, but highlight systematic discrepancies in the collected data.