| 摘要 |
<p>PURPOSE:To identify respective markers by arranging magnetic thin wires, which have rectangular magnetic history characteristics and differ in coercive force, in parallel and selecting the combination of magnetic materials and an intermittence position in an array for each marker. CONSTITUTION:For example, a magnetic markers 11 and 16 have two-four Fe-base amorphous magnetic thin wires 1a-1d lengthwise in parallel to one another and fixed on thin plastic fixed plates 10 to form detecting elements 9. The coercive force Hc is so determined that Hc1a<Hc1b<Hc1c<Hc1d. In pulse voltage sequences induced across a detection coil for the markers 11 and 16, pulse voltages are generated at specific positions of a sine wave magnetic field curve corresponding to the thin wires 1a-1d that they have. Those pulse voltage sequences are signal processed by a measuring instrument and represented as 1 and 0, and consequently the markers 11 and 16, i.e. articles where the markers are stuck can be discriminated because the pattern of 1 and 0 arrays is different between the markers 11 and 16.</p> |
