【作者】 柯丽； 杜强； 秦晓琨； 肖杨； 王旭；

【Author】 Ke Li~(1,2) Du Qiang~1 Qin Xiaokun~1 Xiao Yang~1 Wang Xu~2 (1 Institute of Biomedical and Electromagnetic Engineering,Shenyang University of Technology Shenyang 110178 China; 2 Institute of Electronic Science and Technology Northeastern University Shenyang 110004 China)

【机构】 沈阳工业大学生物医学与电磁工程研究所； 东北大学信息科学与工程学院；

【摘要】 磁感应断层成像技术是一种新的非接触电导率断层成像技术,生物组织经过激励源激励后产生涡流,通过感应线圈测量此涡流场,从而得到生物组织电导率。高频信号检测成为磁感应成像技术的主要难点,本文针对MIT信号为高频弱信号的特点,以FPGA为核心设计了MIT高频磁感应信号采集系统,该系统选用选用低压差线性稳压器作为稳压源,提高系统稳定性,设计调理电路去除外界电磁干扰,并设计RS232串行接口模块,实现10位数据传输。经实验验证,本系统能够实现高速数据采集,以及RS232串口将数据上传计算机的功能。采集速率为80Msps,存储深度为1K,位数为10位。因此本系统具有较好的高频信号采集性能,适用于高频弱信号采集,能够满足高频磁感应信号检测要求。更多还原

【Abstract】 Magnetic Induction Tomography(MIT) is a new method non-contact method of conductivity tomography.In the excitation of excitation coil the biologic tissue inspires perturbation,which could be measured by receiver coils.The detecting of high-frequency is the main difficulty of MIT.For the characteristics of MIT signal,in this paper,a MIT high-frequency magnetic induction signal acquisition system by FPGA was designed. In the detecting system,the low dropout linear regulators was selected as a regulator source to improve the system stability,signal conditioning circuit was designed to exclude the external electromagnetic,and RS232 serial interface module was redesigned to achieve 10 data transmission.Experiment results demonstrate that the detecting system can implement high-speed signal acquisition,and data uploaded to computer by RS232 serial interface.The acquisition speed is 80Msps,1k,10bits.It can get the conclusion that the system suits for high-frequency weak signal detecting with high signal acquisition performance and noise reduction,and it can satisfy the requirements of high-frequency Magnetic induction signal detecting.更多还原