基于GMI效应的弱磁传感器研究

【作者】 郝景毅；

【导师】 卜雄洙；

【作者基本信息】 南京理工大学 ， 测控技术及仪器， 2008， 硕士

【摘要】 巨磁阻抗(Giant Magneto-impedance,简称GMI)效应是20世纪90年代在软磁材料领域发现的一个新的物理现象。利用GMI效应可开发高灵敏度、快速响应、低功耗的新型磁传感器,相比现在广泛应用的各种磁传感器,如磁通门传感器、霍尔传感器、巨磁电阻(GMR)传感器,巨磁阻抗传感器有着诸多无可比拟的优势。因此,GMI效应的物理机理、新材料、新工艺以及应用开发都已经成为该领域的研究热点,应用发展前景广阔。本文分析了非晶材料巨磁阻抗效应,非晶材料的处理方法和特性,以及影响巨磁阻抗(GMI)效应的因素。阐述了基于非晶带巨磁阻抗效应的传感器工作原理,设计并制作了基于非晶带巨磁阻抗效应的磁传感器,其中包括驱动信号电路、检波电路、放大滤波电路、负反馈电路和偏置电路,并通过OrCAD/PSpice对电路进行了验证和优化,完成了传感器的硬件设计。最后通过实验数据分析了基于非晶带巨磁阻抗效应磁传感器的工作特性,测试表明该传感器在一定磁场强度范围内线性度较好,灵敏度高,重复性好,可应用于各种微弱磁场检测领域。更多还原

【Abstract】 Giant Magneto-Impedance (GMI) effect is a new phenomenon founded in the field of soft magnetic materials in the 1990s.The new type of magnetic sensor with high sensitivity, quick response and low power consumption, can be developed by GMI effect. Compared with the wide range of magnetic sensors, such as fluxgate sensors, Hall magnetic sensors, Giant Magneto-Resistive(GMR) sensors, Giant Magneto-Impedance has many obvious advantages. Due to the promising applications, the mechanism, the development of new materials and new technologies have attracted comparative research interest in the field of soft magnetic materials., GMI effect has even more enormous foreground of application.First this article aims to research fundamental theory of the GMI phenomena, the processing and characteristics of GMI materials, the factors that influenced on GMI effect. Then expatiates the sensor principle based on GMI. On the basis of GMI, the weak magnetic sensor is designed, which is composed of the excitation signal circuit, wave detection circuit, amplifier filter circuit, verified the circuit design, optimized the circuit parameters by circuit simulation software OrCAD/PSpice. The sensor circuit has been completed.Finally, a test has been completed on the characteristics of the magnetic sensor. The test turned out that the sensor has eminent properties such as excellent linearity and good repeatability, within a certain magnetic field. The sensor can be used in the weak magnetic measurement field including earth magnetic field and environmental magnetic field.更多还原