摘要
电磁层析成像 (EMT)系统在多个投影方向下各检测线圈的检测信号包含实部和虚部两种信息 ,为了进行准确、快速解调 ,提出了一种基于相位反馈搜索的正交信号解调方法 ,实现检测信号的实时解调 .同时又提出了一种软件归一化修正方法 ,修正了检测线圈特性的不对称 ,并采取了动态信号调理的方法 ,提高了检测系统的信噪比 .
In the EMT (electromagnetic tomography) system the detector signals in different projections have both real part and imaginary part.To demodulate these signals precisely and quickly,a kind of orthogonal demodulation method based on phase feedback search is brought forward.With this method the real time characters of signal processing is enhanced.Furthermore,a software normalization modification method is put forward to compensate the dissymmetry of detectors.Again a dynamic signal conditioning method is used to improve the SNR(signal to noise ratio) of the measurement system.
出处
《天津大学学报（自然科学与工程技术版）》
EI
CAS
CSCD
北大核心
2001年第4期425-429,共5页
Journal of Tianjin University：Science and Technology
基金
国家自然科学基金资助项目 (695740 2 1
598770 1 8)
教育部骨干教师资助计划资助项目
