Magnetic article surveillance system, method and coded marker
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United States of America Patent
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Nov 11, 1986
Grant Date -
N/A
app pub date -
Jun 26, 1985
filing date -
Jun 26, 1985
priority date (Note) -
Expired
status (Latency Note)
Importance
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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Cited Art Landscape
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