A kind of GMI sensor probe based on ring shape amorphous wire and preparation method thereof

Abstract

The invention discloses a GMI sensor probe based on a ring-shaped amorphous wire and a preparation method thereof. The GMI sensor probe comprises a amorphous wire coil which is formed by winding the ring-shaped amorphous wire, wherein the amorphous wire coil comprises an amorphous wire section with the sensitivity to magnetic fields and an amorphous wire section losing the sensitivity to magnetic fields, and a signal acquiring coil is wound around the amorphous wire section losing the sensitivity to magnetic fields; The preparation method of the GMI sensor probe comprises the following steps of winding the amorphous wire into the ring-shaped amorphous wire coil, conducting heat treatment on a defined section of the amorphous wire coil so as to enable the amorphous wire coil to form the amorphous wire section with the sensitivity to magnetic fields and the amorphous wire section losing the sensitivity to magnetic fields, and winding and forming the signal acquiring coil around the amorphous wire section losing the sensitivity to magnetic fields. A processing shortcoming that the amorphous wire is hard to weld can be overcome, amorphous wire spatial reuse is achieved, and meanwhile only a mature heat treatment process in the material processing techniques is needed while plenty of complicated and immature amorphous welding is not needed.

Description

technical field [0001] The invention relates to a biomagnetic signal acquisition device applicable to brain-computer interface technology research experiments, in particular to a GMI sensor probe based on a ring-shaped amorphous wire and a preparation method thereof. Background technique [0002] In the field of magnetic measurement, GMI magnetic sensors have attracted wide attention due to their wide measurement range, high limit sensitivity and their convenience and ease of use. The GMI effect is when the wires or strips of soft magnetic materials (mostly Co-based amorphous and Fe-based nanocrystals) are fed with an alternating current I ac , the AC voltage induced across the material U w With the external magnetic field applied in the longitudinal direction of the wire H ex The phenomenon of sensitive change due to the change of the amorphous material itself is the sensitive change of the impedance of the amorphous material itself with the external magnetic field. T...

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Problems solved by technology

That is to say, the spatial resolution of this scheme is limited by the length of the amorphous wire, which is very limited

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