多激励模式的电磁层析成像系统  

Multi-mode Excitation Electromagnetic Tomography (EMT) System

作　　者：刘泽[1] 何敏[1] 徐苓安[1] 熊汉亮[1] 

机构地区：[1]天津大学电气自动化及能源工程学院,天津300072

出　　处：《仪器仪表学报》2001年第6期614-617,共4页Chinese Journal of Scientific Instrument

基　　金：国家自然科学基金 (695740 2 1 );(598770 1 8)资助项目

摘　　要：根据理论分析和仿真研究提出并实现了一种多激励模式的电磁层析成像系统 ,为研究不同激励模式的优缺点和传感器的优化设计提供了条件 ,在此系统中实现的似平行场激励模式由于增加了独立的投影方向数 ,并具有较均匀的灵敏度分布 ,而提高了重建图像的质量。为了获得多个激励方向各检测信号的实部和虚部 ,作者提出了一种基于相位反馈搜索的正交解调方法 ,提高了系统信号处理的实时性。A kind of multi-mode excitation EMT system is built based on theoretical analysis and simulation study.It can be used to study the advantages and disadvantages of different excitation modes and optimize the sensor design.The quasi-parallel excitation scheme,which is implemented in this system,improves the quality of reconstruction image because it increases the number of independent projections and produces relatively even distribution of sensitivity.For acquiring both real part and imaginary part of detection signal a kind of orthogonal demodulation method based on phase feedback search is presented.Using this method the real-time performance of signal processing is enhanced.

关 键 词：电磁层析成像 传感器 激励系统 信号解调 

分 类 号：TP274[自动化与计算机技术—检测技术与自动化装置]