26 June 2017 Experimental comparison of photogrammetry for additive manufactured parts with and without laser speckle projection
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Abstract
In this paper we show that, by using a photogrammetry system with and without laser speckle, a large range of additive manufacturing (AM) parts with different geometries, materials and post-processing textures can be measured to high accuracy. AM test artefacts have been produced in three materials: polymer powder bed fusion (nylon-12), metal powder bed fusion (Ti-6Al-4V) and polymer material extrusion (ABS plastic). Each test artefact was then measured with the photogrammetry system in both normal and laser speckle projection modes and the resulting point clouds compared with the artefact CAD model. The results show that laser speckle projection can result in a reduction of the point cloud standard deviation from the CAD data of up to 101 μm. A complex relationship with surface texture, artefact geometry and the laser speckle projection is also observed and discussed.
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D. Sims-Waterhouse, P. Bointon, S. Piano, R. K. Leach, "Experimental comparison of photogrammetry for additive manufactured parts with and without laser speckle projection", Proc. SPIE 10329, Optical Measurement Systems for Industrial Inspection X, 103290W (26 June 2017); doi: 10.1117/12.2269507; https://doi.org/10.1117/12.2269507
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