| 摘要 |
FIELD: physics, processing of images. ^ SUBSTANCE: invention relates to means of protection of valuable products against fakes and can be used for protection of museum values, including pictures, jewels, expensive medical products, objects of intellectual property and securities. Proposed method comprises the following steps, i.e. forming passive protective means of a set structure on valuable products, using nano-sized magnetic films as materials, an information symbol to be detected being produced by the reflected 2nd harmonic generation magnetically inducted with the help of external static magnetic field. Note also that, as probing electromagnetic radiation, laser coherent radiation in a near infra-red and visible optical range of wavelengths is used, and permanent magnet or electromagnet is used as a source of aforesaid external static magnetic field. ^ EFFECT: increase in reliability of protection against fakes and copying of valuable products. ^ 5 cl, 2 dwg |
