Design Of The Giant Magneto-impedancemagnetic Sensor Based On Fe-based Nanocrystalline Ribbons

Magnetic field measurement technology, an important tool in the study of magnetic phenomena, has become an independent discipline. Weak magnetic field measurement technology with high sensitivity is widely applied in various fields. It can be used to determine the attitude parameters of satellite and spacecraft, detect submarine vessels and explore for mineral deposits or oil. In the daily life, it can be applied in non-destructive testing and other areas. The discovery of giant magneto-impedance(GMI) effect provides a new alternative for spatial magnetic field detection. Amorphous wire or nano-crystalline materials can make different forms of magnetic core. With the magnetic core, the magnetic sensor with GMI effect improves greatly in size, power and sensitivity.In-depth study on the effect of GMI effect magnetometers has a significant impact on promoting the development of weak magnetic field detection technology and the miniaturization of magnetic field detection equipment in China. Also, it is a necessary to break the monopoly position of Europe and the United States in the filed of high sensitivity magnetometer.GMI sensor Fe-based crystallization of this thesis is based on GMI effect for the relevant experiments. Through research, this paper will clarify the mechanism of GMI effect and mechanism of magnetic field measurements, indicate the feasibility of using high-precision magnetic survey GMI effect, and design the magnetic field measurement system. In the condition of laboratory, the research built up a magnetic measuring system device, and measured and conducted analysis of the GMI magnetic sensor sensitivity, measurement range and other performance indicators.Through comparative analysis of different soft magnetic materials, the paper chose Fe-based crystalline thin strip of material as the sensing element Materials. Nano-crystal thin strip is generally stronger than the anisotropy of amorphous, about two orders of magnitude; Nano-crystals best frequency is much lower than the amorphous material; Nano-crystals saturation magnetostriction coefficient is small; Nano-crystal almost has no magnetic aftereffect effect.Taking into the high intensity and stability of spatial structure, this research designed the way through vertical excitation to apply to the sensing element to Fe-based crystalline thin strip of magnetic core and established longitudinal magnetization model of thin strip of magnetic core. Through the simulation of different material parameters and the excitation signal parameter elements, it got the best excitation signal and material parameters. In the hardware circuit part, this research provides a complete solution of circuit design, component selection, interference and electromagnetic compatibility.Finally, the static calibration experiments data showed that under the conditions of the frequency of the k H100 z excitation signal, open-loop sensitivity is v012.0n Tm /, and impedance change rate is up to %29 and less than linear %2. Experimental results show that the design of this study GMI magnetometer can have a high performance in the measurement of the magnetic field with ±65000n T.