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Multi-thread re-entrant marker with transverse-anisotropy flux concentrators
Multi-thread re-entrant marker with transverse-anisotropy flux concentrators
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机译:带有横向各向异性通量集中器的多螺纹凹入标记
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摘要
A marker for a harmonic electronic article surveillance system includes three wires of magnetic material arranged in parallel. The material has a magnetic hysteresis loop with a large Barkhausen discontinuity such that, upon exposure of the marker to an external magnetic field whose field strength in the direction opposing the instantaneous magnetic polarization of the marker exceeds a predetermined threshold value, there results a regenerative reversal of the magnetic polarization in the material. The three wires are coupled at opposite ends thereof by flux concentrating elements formed of a highly permeable material so that all three wires exhibit the regenerative reversal simultaneously on exposure to the above-described magnetic field. The flux concentrators have magnetic anisotropies oriented transversely relative to the length of the wires to aid in coupling the wires for simultaneous switching.
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