Registers – Coded record sensors – Particular sensor structure
Patent
1990-08-02
1992-12-29
Shepperd, John W.
Registers
Coded record sensors
Particular sensor structure
340551, G06K 708
Patent
active
051754193
ABSTRACT:
An identification method using a magnetic marker including a plurality of amorphous magnetic, thin wires or thin bands which have highly rectangular hysteresis curves and different coercive forces, and are disposed in a parallel fashion with a predetermined separation each other. The magnetic marker is attached to an article passing through the alternating magnetic field. This induces a temporal pulse train in a detection coil, which serves to identify the magnetic marker and therefore the article by pattern recognition of the pulse train. An instrumentation unit stores in advance the occurrence time of each pulse when the magnetic marker passes through the alternating magnetic field with the standard maximum value, and the stored occurrence time (phase) of each pulse is adopted as the reference. A magnetic marker, is identified by passing the marker through a first alternating magnetic field to produce a first pulse train corresponding to the magnetic thin wires or bands. An adjustment value is calculated which is a function of the phase of a selected pulse of the first pulse train and the stored reference phases are corrected on the basis of the adjustment value. This corrected reference phases are compared to the phases of the detected pulses of the first pulse train and the article is identified on the basis of the comparison.
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Fuji Electric & Co., Ltd.
Kessell Michael C.
Shepperd John W.
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