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Illumination: Dark field backlight illumination

Dark field illumination for detection of defects such as scratches, on transparent objects, or to check the quality of embossed or raised lettering.

This technique uses a dark field light behind a transparent object to reveal surface features. It can be used on transparent targets such as glass or plastic that need to be checked for defects such as scratches, or to check the quality of embossed or raised lettering. By using this technique, any surface details are revealed as bright artefacts against a dark background.