Our View #2 - 2012 Q4

Ultra high precision vision inspection

Written by Jørgen Læssøe

CERN the European particle physics organisation in Geneva is looking into the feasibility of making a new accelerator called CLIC, the Compact Linear Collider.

This accelerator will contain 4 million precision machined cobber parts. Every part needs to be measured with an accuracy of 1µm.

JLI has developed a way to automatically measure every part using a novel technique. Rather than focusing on, and measuring the actual surface, we will use the shiny component as an optical part. The patterns from the Dynamic Light Box will be reflected on the curved surfaces, and the position of these patterns will determine the exact dimensions.

The technology can be used in other applications where shiny objects are difficult to measure. JLI works a great deal in the glass industry where precise shapes can be critical. It is likely that the combination of the Dynamic Light Box and cameras can be the solution. Machined metal parts, as in the CLIC application, are also quite common in the industry. It can be hard to measure by optical means because of the surface reflections so reversing the method to rely on the distortion of a known and dynamically changing pattern may be the answer.

Jørgen Læssøe


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