Detection system of position, direction, and equivalent magnetic moment of high accuracy lc resonance type magnetic marker

高精度lc共振型磁気マーカの位置、方向および等価的磁気モーメントの検出システム

Abstract

PROBLEM TO BE SOLVED: To provide a detection system of the position, the direction, and the equivalent magnetic moment of a high accuracy LC resonance type magnetic marker for improving position accuracy by using not only an amplitude but also a phase as a measuring object. SOLUTION: This system is equipped with an excitation coil, a plurality of detection coils facing to the excitation coil, an LC resonance type magnetic marker arranged between the excitation coil and the detection coils, a means for measuring an induction field from the LC resonance type magnetic marker by each detection coil of the plurality of detection coils when the excitation coil generates an alternating-current magnetic field synchronized with a resonance frequency of the LC resonance type magnetic marker, a means for measuring the first induced voltage by the detection coil in the state where the LC resonance type magnetic marker is set, a means for measuring the second induced voltage by the detection coil in the state where the LC resonance type magnetic marker is not set, a means for determining a phase difference θ between the first induced voltage and the second induced voltage, and a means for determining a contribution voltage of the LC resonance type magnetic marker based on the phase difference. COPYRIGHT: (C)2007,JPO&INPIT
【課題】振幅に加え位相も計測対象として位置精度を向上させる高精度LC共振型磁気マーカの位置、方向および等価的磁気モーメントの検出システムを提供する。 【解決手段】励磁コイルと、この励磁コイルと対向する複数の検出コイルと、励磁コイルと検出コイルとの間に配置されるLC共振型磁気マーカと、励磁コイルはLC共振型磁気マーカの共振周波数に同調させた交流磁界を発生させ、LC共振型磁気マーカからの誘導磁界を複数の検出コイルの各検出コイルで計測する手段と、LC共振型磁気マーカをセットした状態での検出コイルによる第1の誘起電圧を計測する手段と、LC共振型磁気マーカをセットしない状態での検出コイルによる第2の誘起電圧を計測する手段と、第1の誘起電圧と第2の誘起電圧の位相差θを求める手段と、この位相差に基づいてLC共振型磁気マーカの寄与電圧を求める手段とを具備する。 【選択図】図4

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