Magnetic article surveillance system, method and coded marker

Details Magnetic article surveillance system, method and coded marker Magnetic article surveillance system, method and coded marker

1985-06-26

1986-11-11

Swann, III, Glen R.

Communications: electrical

Condition responsive indicating system

Specific condition

340551, G08B 1318

Patent

active

046225420

ABSTRACT:
A surveillance system is based upon generation and detection of phase shifted harmonic signals responsive to transmission of a reference signal at a fundamental frequency in a detection zone. Phase shifted harmonic signals may be generated by markers comprising a core of soft magnetic material and an electrically conductive material at least partly surrounding the core. Phase shifted harmonics are not accidentally generated by biassed ferrous alloys, the cause of most system failures.

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