DEVICE AND PROCESS FOR MAGNETIC MATERIAL DETECTION IN ELECTRONIC ARTICLE SURVEILLANCE (EAS) ELECTROMAGNETIC SYSTEMS

The present invention relates to a device with its related electronic circuit and to a detection process targeted to detect any magnetic material moving around the antennas/sensors used in Electronic Article Surveillance (EAS) electromagnetic systems, which can be internally or externally coupled to these kind of anti-theft systems, significantly decreasing its current vulnerability to fraud since the current EAS electromagnetic systems are vulnerable for not being able to detect magnetic materials. The present process and detector device filter and treat the DC signal generated by the displacement of a magnetic material around one or more EAS electromagnetic system antenna/sensor(s). Magnetic material detection is achieved from a differential signal existing in the antenna/sensor receiver, such signal being forwarded to a control unit wherein there are coupled a device comprising a "n" order filter, a buffer, a sensitivity control circuit, a control logic and an alarm module.