| 摘要 |
A security system for protecting articles ( 8 ), the system comprising at least one Electronic Article Surveillance (EAS) loop ( 1 ) , one Emitting Unit ( 7 ) and one Detecting Unit ( 9 ) attached to each article ( 8 ) to be protected, the Detecting Unit ( 9 ) having a detector to detect electromagnetic fields emitted by the EAS loop ( 4 ) and the Emitting Unit ( 7 ) and to distinguish between them, and an alarm generator for generating an alarm if a predetermined sequence of fields is detected. The system combines existing EAS loops ( 4 ) normally present in a retail store with Emitting Units ( 7 ) and Detecting Units ( 9 ) so as to monitor movement of articles ( 8 ), especially supermarket trolleys, around the retail store.
|
