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Study on Key Technique of Electromagnetic Detection for Metal

Author: MengJian
Tutor: WangChao
School: Tianjin University
Course: Detection Technology and Automation
Keywords: Steel microstructure Measurement of electromagnetic induction Eddy current Field-programmable gate array (FPGA)
CLC: TP274.4
Type: Master's thesis
Year: 2008
Downloads: 129
Quote: 1
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Abstract


In the production process of the steel strip temperature distribution and cooling rate has a very important impact on the microstructure of the steel, thus affecting the yield strength, tensile strength and ductility material properties, therefore capable of online monitoring of the microstructure of the steel The instrument proposed urgent needs. The process of change in the content of the respective phases of the steel accompanied by obvious changes in the characteristics of the solenoid, electromagnetic induction measurement techniques and electromagnetic tomography (EMT) technology can also obtain the conductivity of the object field and (or) the magnetic permeability distribution of information, and non-intrusive and non-contact measurement characteristics, therefore, will have broad application prospects in industrial areas. This study is the relationship between metal electromagnetic properties of the sensor output, designed and implemented a set of digitized electromagnetic induction measurement system, laid the foundation for the final application EMT technology to achieve the on-line monitoring of the steel microstructure. The topics, complete the following work: 1, application of electromagnetic measurement technology in the steel production process, the key is to address the relationship between the three steel microstructure, electromagnetic properties and sensor output. In this paper, in theory, a preliminary study on the relationship between the the axisymmetric sensing coil is carried out in-depth study of the measured metal plate side, come to a resolution between the sensor output and the various parameters expression. 2, designed and implemented an FPGA-based electromagnetic induction measurement system. The system is based on FPGA as the core, with the flexible mixer incentive model, induced voltage and excitation current signals measured at the same time, resulting in the induction impedance. FPGA-based digital demodulation to obtain accurate amplitude and phase of the measured signal, and having a flexible structure and speed characteristics. 3, on the basis of this hardware platform, a series of experimental study of feasibility. First, the measurements performed on the known resistor and capacitor fully illustrates the high degree of accuracy of this measurement system. Then, a variety of metal plate measuring experiment to verify the electrical conductivity, magnetic permeability, the thickness of the metal plate and the lift-off distance sensor output, the theory and practice to achieve a better consistency. Finally, some suggestions for further research and hardware system deficiencies.

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CLC: > Industrial Technology > Automation technology,computer technology > Automation technology and equipment > Automation systems > Data processing, data processing system > Centralized testing and roving detection system
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