An automatic measurement device for amorphous wire impedance tensor

Abstract

The invention proposes an amorphous wire impedance tensor measuring device. The device comprises a control computer, measurement control software, a programmable current source, a programmable signalgenerator, an amorphous wire, a two-axis Helmholtz coil, a solenoid coil and a signal processing circuit board. The control computer carries out program control on the programmable signal generator, the programmable current source parameters and the signal processing circuit board through the measurement control software to realize the automatic measurement of the amorphous wire impedance tensor under different parameters, and an impedance tensor characteristic curve is drawn. The excitation signal and measurement signal of each impedance measurement are switched to the corresponding excitation port and measurement port through a signal switching matrix. All components of the impedance tensor are measured on one measuring device. The amorphous wire impedance tensor measuring device is usedfor anisotropic study of an amorphous wire magnetic medium, and can provide technical means for accurately establishing an amorphous wire magnetic field sensing model.

Description

technical field [0001] The invention belongs to the technical field of impedance measurement, and in particular relates to an impedance tensor measurement device for anisotropic magnetic media. Background technique [0002] Amorphous wire has a wide range of applications due to its unique magnetic domain structure and magnetic effects, such as bistable effect, Matterky effect, and giant magneto-impedance effect. The traditional giant magneto-impedance measurement mainly adopts the diagonal method. The method is to apply an excitation current to the amorphous wire, measure the voltage across the amorphous wire, and obtain the impedance through the ratio of the voltage to the current. This model assumes that the measured magnetic field is a uniform axial Magnetic field, so its application is limited to the measurement of axial magnetic field. Under the current physical model, the treatment of non-axial magnetic field can only be compensated by empirical formula. [0003] Amor...

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Problems solved by technology

The traditional giant magneto-impedance measurement mainly adopts the diagonal method. The method is to apply an excitation current to the amorphous wire, measure the voltage across the amorphous wire, and obtain the impedance through the ratio of the voltage to the current. This model assumes that the measured magnetic field is a uniform axial Magnetic field, so its application is limited to the measurement of axial magnetic field. Under the current physical model, the treatment of non-axial magnetic field can only be compensated by empirical formula

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