ELEMENT, DEVICE AND METHOD FOR MARKING A PRODUCT

摘要

The invention relates to a method and device for the ultrasonic identification and/or authentication of an object to be identified and/or authenticated, including a marking element including a substrate in which impurities are distributed, wherein ultrasonic waves are absorbed by said impurities, and move within said impurities at speeds that are different than those at which the ultrasonic waves move within the substrate, the distribution of the impurities in said element being detectable by the ultrasonic reading device and used for identifying and/or authenticating said object.