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

Brownhill, A; Brade, R; Robson, S; (2009) Performance Study of Non-Contact Surface Measurement Technology for Use in an Experimental Fusion Device. In: (Proceedings) 36th International Conference on Plasma Science and 23rd Symposium on Fusion Engineering. : San Diego.

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Abstract

The EFDA-JET experimental fusion device is exploring the potential for fusion as a safe, clean and virtually limitless energy source. To create fusion on Earth involves ~100 million degree C plasma constrained by a high power magnetic field inside an ultra-high vacuum Torus. The Torus is protected from the effects of the plasma by a ‘first-wall’ which is capable of handling high heat loads and neutron bombardment; it is positioned in-line with outputs from power handling calculations to support fusion experiments and installed remotely. In support of the ITER project which is building a new, larger fusion machine, a new first-wall will be installed at EFDA-JET to test materials for use at ITER. This new first- wall will be inspected using current techniques but the complexity of the new plasma facing surface has created a need for detailed surface inspection for installation and performance checks. In order to evaluate non-contact surface measurement technologies for remote use at EFDA-JET a test piece has been developed which simulates a section of the EFDA-JET machine and the features which must be measured (including steps and gaps in the range 0.04-0.2mm and 0.35-2mm respectively). The test piece, occupying a volume 2x2x1m is currently being measured using a selection of equipment from metrology suppliers, focusing on active optical measurement technologies i.e. laser triangulation and projected fringe triangulation. Data processing involves the use of software developed at University College London to automatically extract point cloud data of individual components based on their CAD model from within the collected point cloud to achieve a standardized processing technique. Results and processed data from these tests will be made available to interested parties. Systematic errors found within the collected data will be presented with a focus on the physical characteristics of the technology to highlight the practical strengths and weaknesses of different measurement methods. The presentation will also include a critique on whether identified errors can be overcome or if the technology has reached a physical limitation.

Type:Proceedings paper
Title:Performance Study of Non-Contact Surface Measurement Technology for Use in an Experimental Fusion Device
Event:36th International Conference on Plasma Science and 23rd Symposium on Fusion Engineering
UCL classification:UCL > School of BEAMS > Faculty of Engineering Science > Civil, Environmental and Geomatic Engineering

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