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1. (WO1999005636) TRACKING METALLIC OBJECTS BY INFORMATION INCORPORATED THEREIN

Pub. No.:    WO/1999/005636    International Application No.:    PCT/HU1998/000073
Publication Date: Fri Feb 05 00:59:59 CET 1999 International Filing Date: Wed Jul 29 01:59:59 CEST 1998
IPC: G06K 1/12
Applicants: MAGYAR ÁLLAMVASUTAK RÉSZVÉNYTÁRSASÁG
BÉLI, János
KESZTE, Tóbert
MOLNÁR, Péter
POSGAY, György
SZAMOS, Alfonz
TAKÁS, János
Inventors: BÉLI, János
KESZTE, Tóbert
MOLNÁR, Péter
POSGAY, György
SZAMOS, Alfonz
TAKÁS, János
Title: TRACKING METALLIC OBJECTS BY INFORMATION INCORPORATED THEREIN
Abstract:
The subject of the invention is method and device system for entering and retrieving information in the surface layer of objects made of solid matters. The information is entered with a (concentrated) beam directed to the surface and having a power density selected to induce permanent change at least in the surface layer of the material's structure in a way that the power density of the beam is smaller that the power density of the beam causing visible deformation, but bigger than that of the beam that causes (within the order of magnitude of the beam's diameter) inhomogeneities commensurable with the structural inhomogeneities generally present in the material. The invention can be used for all materials, the structure or internal stress of which can be modified with high energy density surface treatment (at the location of the treatment) (specially with the local laser treatment of ferromagnetic material).