3: Alignment of Multiple Scans
Wednesday 31st August 2011
In many production line applications, the scanner is used to replace a vision system – bringing super-accurate 3D data into the inspection mix. In these applications, we aim to inspect the component using a single scan. Not so here – for CFD, a complete model of the car was required, and the result was many dozens of scans which needed to be combined to create the full model.
There are many ways of doing this. The GEM Studio software includes both local and global photogrammetry – recognising markers on the car, and using these to link scans together. These markers are typically applied as a few low-tack stickers, which are readily removed. Relatively few stickers are required – typically only three are required to link two scans together.
Another approach is to use the geometry of the car itself to combine the scans. This is extremely effective in areas where there is a strong geometric identity, and perhaps the tolerances are more relaxed. As an example, the car’s wheels were scanned individually using this approach – the wheels have very strong geometry with securing bolts – and the resulting scan’s accuracy far exceeds the likely wear tolerance of rubber tyres!
This process created a model containing approximately 250M measurements in a single model suitable for CFD.
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