ELECTRONIC ARTICLE SURVEILLANCE SYSTEM WITH METAL DETECTION CAPABILITY AND METHOD THEREFOR

摘要

A method for detecting metal using an electronic article surveillance ("EAS")system. The EAS system includes atransmitter and a receiver. An EAS interrogation signal is transmitted toestablish the interrogation zone. The EAS interrogationsignal is used to detect EAS markers and metal objects within theinterrogation zone. The EAS signal is received and a metal objectpresent in the interrogation zone is detected during a metal detection cycle.The metal object is detected based upon perturbationsin the received EAS interrogation signal. The metal detection cycle isperiodically interspersed with at least one EAS detectioncycle.