| 摘要 |
<p>A method and an apparatus are presented for providing an identity marking on an object (2) made of an electrically conductive material with crystalline structure. A plurality of areas is selected on a surface of the object. For each selected area, an electrode (5) is positioned in proximity with the selected area. A fluid is supplied between the electrode and the selected area, and an electrical impulse is generated between the electrode and the selected area through the fluid. In response, a plasma channel is formed, wherein a structural material change occurs locally at each selected area. The identity marking of the object is represented by the selected areas with their structural material change.</p> |
