Images of embossed metal coated paper acquired with the Leica DVM6 using different illumination contrast methods (schematic inset): A) full ring light; B) quarter of the ring light; C) coaxial light with polarizer open; and D) coaxial light with polarizer closed. The quarter ring (image B) and coaxial light with polarizer open (image C) enhance the embossed squares, while the coaxial light with polarizer closed (image D) enhance the imperfections or contamination.
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For industrial manufacturing, it is critical to speed up the inspection and QC process. If the feature of interest is detected or seen more easily by enhancing its appearance with different types of illumination and contrast, then less time is needed for inspection and testing. Recent developments in digital microscopy have led to more a practical and efficient way of using illumination contrast methods for inspection and QC purposes.
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