Target/actual comparison & false color image display
Make geometric deviations visible. Document quality in a traceable manner.
The target/actual comparison is a key method for the geometric analysis of components – for example in series production approval, incoming goods inspections or as part of complaint investigations. The real object is compared with the digital CAD model and the geometric deviations are visualized in colour – the result is a false colour image that shows at a glance where tolerances have been met or exceeded.
How does the target/actual comparison work?
- 3D scan of the component using a structured light or laser scanner
- Digital alignment of the scan to the CAD model (according to RPS, 3-2-1 or Best-Fit)
- Calculation of the point-to-surface deviation over the entire surface
- Visualization of the deviations as a false colour image incl. scale (e.g. -0.50 mm to +0.50 mm)
- Report generation with limit value display, hotspots and graphical legend
Advantages of the false color comparison
- Quick interpretation of complex geometries thanks to color display
- Full-surface analysis instead of selective random sample measurement
- Can be combined with classic inspection features (e.g. bore diameter, radii)
- Ideal for development, QA and series release
Typical applications
- Testing of injection molded parts, sheet metal molded parts, cast parts
- Evaluation of warpage, shrinkage or material displacement
- Adjustment of mold core or tool corrections
- Quick release test before series production starts
- Documentation as part of sampling procedures (e.g. PPAP, VDA Volume 2)