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Amorphous wire MI micro sensor using C-MOS IC multivibrator

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5 Author(s)
Kanno, T. ; Dept. of Electr. Eng., Nagoya Univ., Japan ; Mohri, K. ; Yagi, T. ; Uchiyama, T.
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A family of sensitive, stable and low power consumption MI micro magnetic sensors are constructed using a CMOS IC multivibrator circuit, in which a sharp pulse train current is applied to an amorphous wire to cause the skin effect. A micro field sensor having a resolution of 10 -6 Oe with a full scale (FS) of ±1.5 Oe and a nonlinearity of less than 0.2%, a cut-off frequency of ~200 kHz, and a power consumption in the oscillation circuit of 0.5~5 mW is obtained using a zero-magnetostrictive FeCoSiB amorphous wire of 30 μm diameter and 2 mm length. A differential field sensor is also constructed using a pair of amorphous wires suitable for detection of a localized held with the resolution of 10-4 Oe cancelling uniform disturbance fields such as terrestrial field. Non-contact sensing of a magnetic card surface field was demonstrated

Published in:

Magnetics, IEEE Transactions on  (Volume:33 ,  Issue: 5 )

Date of Publication:

Sep 1997

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