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Phase detection of high-frequency carrier-type thin-film sensor

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4 Author(s)
Yabukami, S. ; Res. Inst. of Electr. Commun., Tohoku Univ., Sendai, Japan ; Mawatari, H. ; Shimoe, O. ; Arai, K.I.

We propose, herein, a method by which to measure the phase of the carrier in a high-frequency carrier-type sensor (giant magneto impedance sensor). The proposed method is based on a carrier suppression technique. The phase of the carrier signal changed dramatically by approximately 180° around the carrier suppression when a small dc field was applied. The phase sensitivity for a small dc field reached 3600°/Oe. In addition, in the present study, we investigate the relationship between phase sensitivity and suppressed carrier level in the suppression circuit, the measured data nearly corresponded to theoretical data.

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Magnetics, IEEE Transactions on  (Volume:39 ,  Issue: 5 )