High-speed and noncontact validation of rapid prototyping parts

Pierre Boulanger; Veronique Moron; Tanneguy Redarce

doi:10.1117/12.263358

9 January 1997 High-speed and noncontact validation of rapid prototyping parts

Pierre Boulanger, Veronique Moron, Tanneguy Redarce

Proceedings Volume 2910, Rapid Product Development Technologies; (1997) https://doi.org/10.1117/12.263358
Event: Photonics East '96, 1996, Boston, MA, United States

Abstract

A new automated inspection algorithm of rapid prototyping parts using a 3D laser range sensor is described. The input to the program is a series of trimmed NURBS saved in an IGES format or an STL file and an unordered series of measurements produced by a 3D optical sensor. The output is an inspection report indicating the level of discrepancy between the measured points and the model. Using a color scheme, an operator can rapidly identify problems in the rapid prototyping process and validate if the produced part is conform the intended design. At the base of the method, a new robust correspondence algorithm which can find the rigid transformation between the tessellated model of the part and the measured points, is presented. This method is based on a least median square norm capable of a robustness of up to 50 percent. The robustness of the method is essential since one cannot guarantee that in practice, all the points in the measured set belong to the model. These types of algorithms are usually quite costly in computational complexity, but we will show that one can speed-up these algorithms by using the well-known iterative closest points algorithm and a multi-resolution scheme based on planar surface tessellation and voxels.

Citation Download Citation

Pierre Boulanger, Veronique Moron, and Tanneguy Redarce "High-speed and noncontact validation of rapid prototyping parts", Proc. SPIE 2910, Rapid Product Development Technologies, (9 January 1997); https://doi.org/10.1117/12.263358

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