磁性めっき線のFe薄膜の厚さに依存する渦電流形変位センサの直線範囲(計測・高周波デバイス)

概要

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A magnetoplated wire (MPW) is a copper wire whose circumference is plated with a magnetic thin film. The effects of using an MPW are a decrease in the proximity effect, an increase in inductance, and generation of more flux than when copper wire is used. The ratio of the linearity range L_o to the outer coil diameter D of the eddy current displacement sensor is extended by using MPW for the coil. However, the relationship between the Fe film thickness of MPWs and the linearity range characteristic has not been clarified. We measured the output voltage characteristics of MPW coils with Fe film thicknesses of 0.7μm,1μm, and 1.1μm, and calculated L_o/D ratios. As a result, we found that the L_o/D ratio of an MPW coil with a 1-μm-thick Fe film had a maximum value of 0.66.
社団法人日本磁気学会の論文
2007-03-01