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

G - Physics

01

N

340/124.3

G01N 27/72 (2006.01) G08B 13/24 (2006.01)

Patent

CA 1232647

MAGNETIC ARTICLE SURVEILLANCE SYSTEM, METHOD AND CODED MARKER Abstract of the Invention 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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