C.BAULT 130 Juin 2009

REVERSE ENGINEERING BY LASER SCANNER 3D

• What is Reverse Engineering?

• Several kinds of measure instruments

• Tests done on a mockup

• Scan of ATLAS calorimeter face

• How build surface from scans ?

• Conclusion

Research and development shown here was been by:

• PH/DT/PO: Andréa CATINACCIO, Aurélie MAURISSET, Mark HATCH and Christophe BAULT• Survey section managed by Christian LASSEUR

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What is Reverse Engineering?

Wikipedia definition:The reverse-engineering process involves measuring an object and then reconstructing it as a 3D model. The physical object can be measured using 3D scanning technologies . The measured data alone, usually represented as a point cloud, lacks topological information and is therefore often processed and modeled into a more usable format such as a triangular-faced mesh, a set of nurbs surfaces or a CAD model.Work Package:

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What is Reverse Engineering?

Exemple at CERN:

Few exemples:

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Several kinds of measure instruments

With a scanner at the end of a harm

Non mobile laser scannerManual laser scanner

Photogrammetry camera on support

Slide extracted from Aurélie’s presentation

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Tests done on a mockup

Mockup for tests Scan of mockup shown on FARO software

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Tests done on a mockup

Cloud of point loaded on CATIA Mesh done on CATIA

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Scan of ATLAS calorimeter face

Scan of ATLAS calorimeter face(about 300 Millions points)

Cloud of point loaded on Catia(a small part)

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Scan of ATLAS calorimeter face

Mesh on Catia

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Scan of ATLAS calorimeter face

Mesh on Catia (zoom)

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Scan of ATLAS calorimeter faceInsertion of mesh in a Catia 3D environment

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How build surface from scans ?

We have sawn sufaces built on Catia are not acceptable. So we foresee test several sofwares be able mesh cloud of point, and create nurbs to make a light surface: 3D Reshaper, Rapidform and Geomagic.

Below: Surfaces of Atlas calorimeter face created on Geomagic

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Conclusion

What we have done: With Survey section, we have done a lot of research about Reverse Engineering methodology, type of laser scanner and softwares available on the market.We have done several tests of laserscanner with sub-contractor

Work to do: Now, we have to test softwares, to learn their using, and take decisions about materials Cern should buy.