| 摘要 |
<p>PURPOSE:To enable discrimination of a substance to be detected, by using at least one magnetic marker different in a magnetic hysteresis characteristic for each substance to be detected and by analyzing a waveform of a voltage outputted by a change in a magnetic flux generated in an alternating-current magnetic field. CONSTITUTION:A detecting element 9 is prepared by using two amorphous magnetic slender wires 1a and 1b having soft magnetism for a magnetic marker 11 and by fixing these wires in parallel with each other between fixing plates 10 of plastic or the like. For these wires, substances being different in a magnetic hysteresis characteristic are used so that the maximum magnetic flux of the slender wire 1a is larger than that of the slender wire 1b and that the coercive force of the slender wire 1a is smaller than that of the slender wire 1b. When an article having the element 9 stuck thereon is set to a discriminating device and an external alternating-current magnetic flux is applied thereto, an induced electromotive voltage being different in a waveform, an output level and a phase is detected as a single or compound waveform, since each magnetic material has different flux-field hysteresis characteristics (the coercive force, the maximum magnetic flux, permeability, etc.). By subjecting said waveform to a frequency analysis to discriminate a frequency pattern intrinsic to each marker 11, the classification of the article can be determined.</p> |
