| 摘要 |
The method for checking the authenticity of documents consists in that magnetic ink is applied as authenticity feature (6) at least at one place on the document (1) and the paramagnetic or the ferromagnetic resonance characteristic of the ink material is determined at least partially and evaluated. The authenticity feature (6) is exposed to the effect of a high-frequency alternating magnetic field (H1) generated with the aid of a coil (2a; 2b) and an alternating-current generator (3), and to the effect of a constant steady-state magnetic field (H2) generated with the aid of a permanent magnet (4a, 4b). The coil (2a; 2b) is part of a resonant circuit, the characteristic of resonance of which corresponds to the characteristic of resonance of the ink material and is determined, for example with the aid of a millivolt meter (5), and evaluated. <IMAGE>
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