Study On Digital Magnetic Measurement Method And System Based On Electromagnetic Induction

During the past 30 years, the magnetic technology which is represented by the electromagnetic actuator, the permanent magnet technology and their applications has been developed greatly. The magnetic technology has many applications. In this case, the magnetic measurement technology has also been advanced and becomes the research hotspots in the related field. In our country, the traditional analog measuring devices are not satisfied. Therefore, it is urgent to develop a digital magnetic measuring system which can satisfy the need of the industry and scientific research.Based on the Faraday's law of electromagnetic induction, the thesis presents a digital magnetic measuring system with human operation interface whose core is the MSP430F149 single chip, and studies the theories and technology referring to the sensor and inspecting, the data treatment and the results output in the system. Then series of measuring experiments are carried out with the system, and the results indicate that this magnetic measuring system can meet the prospective requirements.Firstly, the paper reviewed the development and research status quo of the magnetic measurement technology in and out of the country, and pointed out that the magnetic application and magnetic measurement technology's mutual promotion accelerated the appearance of some new ways and technology in related field and deepened the magnetic measurement theory and technology. The research focus on the digital minitype magnetic measurement device and the 3D digital middletype one are the research hot issues. Then, the related theory and technique of magnetic measurement based on electromagnetic induction are presented. The referring magnetic laws, the digital techniques and the measurement methods for absolute time-changing field, the position-changing field and the time-position-changing field are all included in this chapter. Besides, measuring different system's magnetic field, the coil sensors with various shapes and the data treatment method are studied. In the following chapter, the paper has discussed the problems of magnetic measurement using Helmholtz coils, setting up the Helmholtz coils model, analyzing the magnetic field with finite element...