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题名	感应式磁声成像硬件系统研究; 感应式磁声成像硬件系统研究
作者	1江凌彤,电工研究所
学位类别	硕士
答辩日期	2009-06-03
授予单位	中国科学院电工研究所
导师	1刘国强,电工研究所
关键词	感应式 磁声成像 Magnetic Induction Magnetoacoustic Tomography
其他题名	感应式磁声成像硬件系统研究
中文摘要	感应式磁声成像方法是一种新的电磁成像技术，该技术利用声场、电场和磁场的耦合作用来对试验样本进行无损检测，可以准确地获取被测组织的电导率分布。 在现有的研究基础上，本论文提出一种无需磁体装置的新的感应式磁声成像方法，并且通过实验和数值仿真相结合的方法验证了这种新方法的正确性和可行性，为进一步开展感应式磁声成像方法的理论和实验研究奠定了基础。 阐述了感应式磁声成像方法的基本原理，通过仿真计算与分析，摆脱了常规感应式磁声成像方法对静磁场的依赖，设计研究了新的不需要静磁场的感应式磁声成像的硬件系统。制作了符合实验要求的脉冲激励线圈，选择合适的微音器，设计并搭建了声波检测电路。 分析了二维轴对称模型的瞬态电磁场、位移场和声场等多物理场耦合的理论基础，提出多物理场耦合的计算方法并详细地推导了各个场的计算公式,利用数值仿真方法分析了无样本和铜片样本两种情况下的线圈、样本受到的洛仑兹力、产生的位移、激发的声场等与检测相关的重要的物理参数，最后采用非线性正弦拟合以及频谱分析等方法把仿真得到的声波信号等重要数据进行分析，为声波信号的实时检测提供了依据。 以铜片为样本进行了比较详尽的实验，详细分析了实验结果，对所测得的声波信号进行频谱分析，并与理论分析的结果进行比较，结果比较吻合，验证了理论分析的正确性。 At present, Magnetoacoustic Tomography with Magnetic Induction (MAT-MI) is a new electromagnetic imaging method.The sample can be detected nondestructively with the coupling of acoustic and electric-magnetic fields. By using of this method, The distribution of conductivity in the sample could be obtained accurately . Based on the previous research，a new method of MAT-MI without magnet device is proposed in this paper. Through the experiments and numerical simulation, the correctness and feasibility is verified. And the study will lay the foundation for theoretical and experimental researches on MAT-MI. The basic principles of MAT-MI are expounded, and a new MAT-MI hardware system without static magnetic field is designed. Based on the simulation and analysis, the static magnetic field which is needed in the conventional MAT-MI method can be got rid of. To achieve the experimental requirments, the excited coil is produced, a sutiable microphone is chosen and a sound detection circuit is designed and built. The principles of multi-physical field coupling, such as the two-dimensional axisymmetric transient electromagnetic field, displacement field, sound field and so on, are analysed , and the method of multi-physical calculations is put forward. On the basis of above all, the formulas for calculating the various fields are derivated detailedly. Then the important physical quantities and parameters on the coil and the samples, such as the Lorentz force, the caused displacement, the sound field excited with or without copper samples are calculated by numerical simulation methods. At last, the important data such as acoustic signals collected from the numerical simulation are analysed by non-linear sine fitting and spectral analysist methods, which provids support for real-time detection of acoustic signals. The experiments are conducted on copper samples and the results are analysed in detail. The experimental results obtained through the spectrum analysis of acoustic signal are relative agreement with the results of theoretical analysis, which verifies the theoretical analysis.
语种	中文
公开日期	2010-10-18
页码	65
分类号	TM1
内容类型	学位论文
源URL	[http://ir.iee.ac.cn/handle/311042/7173]
专题	电工研究所_其他部门_其他部门_硕士学位论文
推荐引用方式 GB/T 7714	1江凌彤,电工研究所. 感应式磁声成像硬件系统研究, 感应式磁声成像硬件系统研究[D]. 中国科学院电工研究所. 2009.

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