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Additional resources for Developments in Security Labels and Tags
By design, the disturbed signal created by the tag and detected by the receiver is distinctive and not likely to be created by natural circumstances. The tag is the key element, as it must create a unique signal to avoid false alarms. The disturbance in the electronic environment caused by a tag or label creates an alarm condition that usually indicates someone is shoplifting or removing a protected item from the area. The nature of the technology dictates how wide the exit/entrance aisle may be.
In response to the changing magnetic field created by the transmitter, the magnetic field domain of the tag material abruptly "switches" as the field strength varies past a particular point, whether positive or negative, during each half of the transmit cycle. This abrupt change in the magnetic state of tag material generates a momentary signal that is rich in harmonics (multiples) of the fundamental frequency. Using electronic signal processing techniques, the system identifies that the harmonics are at the right frequencies and levels, and that they occur at the proper time in relation to the transmitter signal.
Seals, holograms and secure inks. SM automatically manages detected unauthorised events and provides specific information to the brand owner/manufacturer and the verification point, including, but not limited to: the IP address at which the code verification was attempted; geographic location of the counterfeit product based on information already in the database or feedback from the verifier; time the invalid code was identified. Verification codes can also be submitted to a dedicated call centre, which then uses the Internet to check code authenticity.