Sensors available today are extremely limited in checking the quality of these security features such as holograms with a tilt effect. Their speed is often insufficient to check the banknotes in real time. AIT, an internationally leading institution when it comes to the production of such testing systems for security printing, cooperated with the Fraunhofer Institute for Microelectronic Circuits and Systems in Duisburg in developing a new sensor.
The result of their collaboration is a 60 line sensor which works twice as fast as currently available solutions. At the same time, it provides high quality images in a very high resolution. The sensor detects the banknotes, similar to a scanner, line by line when they come off the press. The camera takes up to 200,000 color images per second, with exposures of millionths of a second. A special software compares these recorded images with the desired image, and identifies banknotes with faulty safety features.