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Article | October 27, 2011
EMX Industries, Inc: UV luminescence sensors detect UV markings
EMX Industries’ UV luminescence sensors are used to detect and verify the presence of UV markings and materials during production processes, responding to materials such as paints, greases, inks and adhesives that have luminescent tracers.
The tracers emit light in the visible spectrum when stimulated by a UV light source. The technique of applying a luminescent marking is useful in applications where there is significant variation in the background that needs to be ignored, such as text and graphics printed on labels. A luminescent mark can be printed using an invisible ink anywhere on a label without affecting the aesthetics of the label, while allowing a luminescence sensor to detect the mark to verify presence, orientation and positioning of the label.Often, clear films such as those used in tamper-evident seals contain optical brighteners that cause them to luminesce in the presence of a UV light source.Many commonly used packaging and production materials use luminescent tracers as a means of providing presence verification. Since many of these materials are clear or nearly clear, other types of sensors are not suitable for reliable verification.
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