GERÄT ZUR DETEKTIERUNG VON MARKIERTEM PAPIER UND VON DIESEM GERÄT DETEKTIERBARES MARKIERTES PAPIER

• Main Authors: ACHER, OLIVIER, LEDIEU, MARC, JOUBERT, JEAN-CLAUDE
• Format: Patent
• Language: German
• Published: 15.04.2004
• Edition: 7
• Subjects: ALARM SYSTEMS; DETECTING MASSES OR OBJECTS; GEOPHYSICS; GRAVITATIONAL MEASUREMENTS; INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIRCHEMICAL OR PHYSICAL PROPERTIES; MEASURING; ORDER TELEGRAPHS; PHYSICS; SIGNALLING; SIGNALLING OR CALLING SYSTEMS; TESTING

The invention relates to a marked paper document and a marked paper document detection device. The device comprises excitation means (A1, A2, A3) for varying the magnetization of glass-covered amorphous ferromagnetic filaments contained in the marked paper document with time, and means for detecting...