Digital Microscopy with Versatile Illumination and Various Contrast Methods for More Efficient Inspection and Quality Control

Example applications using the Leica DVM6 with integrated ring light or coaxial illumination system

June 03, 2015

State-of-the-art digital microscopes utilizing a versatile illumination system capable of achieving multiple contrast methods, such as the Leica DVM6, are very useful for inspection, quality control, and failure analysis. These contrast methods allow flaws or defects on the surface of a product or component to be more easily and rapidly detected. Some examples of how modern digital microscopes can help to make the workflow more efficient for inspection, quality control, and failure analysis are discussed.

Different images of the trimmed edge (cross section) of a Sn-plated Cu leadframe taken with the Leica DVM6 using different illumination contrast methods (schematic inset): A) full ring light; B) coaxial light with polarizer open; C) coaxial light with relief contrast and polarizer open; and D) coaxial light with polarizer closed. The images show with varying levels of contrast that the Sn is smeared over the most of the Cu surface, except at the bottom where the pin broke off and the Cu is visible.

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.

Register to download the free report in Englisch or German (Effizientere Inspektion und Qualitätskontrolle durch vielseitige Beleuchtungsvarianten in der Digitalmikroskopie).

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