Holograms are increasingly being used for the forgery-proof labelling of expensive branded articles. Sick is presenting a scanner at the Hanover Trade Fair that detects holograms during attachment to the packaging, or for subsequent inspection of authenticity.
Holography is a technique found in physical optics with which objects drawn in three dimensions are attached to two-dimensional carriers, e.g. packaging, by means of laser light.
Hologram detection is demanding
Even though imprinted holograms sometimes light up in colours, a colour sensor would be useless as the colour is not attached, but only exists through the bending of incident light.
The detection task is complicated because the hologram is highly reflective, as is the background. However, holograms can be reliably detected by the KT 5 Display contrast scanner both during their attachment by machine and during a packaging process.
Special strengths of the KT 5 Display contrast scanner
This is possible because the KT 5 Display contrast scanner exploits its special strengths that are essential for hologram detection. Thus both the highly reflective hologram and the particular background can be precisely taught-in.
Visualisation and the fine adjustability of the switching level via the display, allows for accurate and reproducible setting of the KT 5 Display contrast hologram sensor. Automatic dazzle adaptation also ensures detection reliability and availability even with highly reflective carrier surfaces.