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Sometimes capturing minor height variations relative to standard surface roughness can be difficult. If your standard surface roughness is 1/2 a micron and the profile is another 1/2 micron, it can be difficult to see the forest for the trees. Taking a 3D scan of a surface enables you to see patterns that would otherwise be missed. While it may take significantly more time to do a 3D scan, it is certainly worthwhile if the feature locations are unkown or can vary. The photos illustrate this vividly.
Some assessment of conductive ink print quality can be made between the two solar cells tested. In the lesser quality cell there is much more variability in the printing of the bars.
Also shown is a black ink print on brushed aluminum. A simple 2D scan removes the context and it becomes slightly more difficult to determine the region of interest. Placed within a 3D context, the region of interest becomes more apparent.
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