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

C.BAULT 1230 Juin 2009

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.