电磁成像系统正弦信号发生器的设计  

Design of Sinusoidal Signal Generator for Electromagnetic Imaging System

作　　者：于长敏 申海[1] YU Changmin;SHEN Hai(School of Physical Science and Technology,Shenyang Normal University,Shenyang 110036,China)

机构地区：[1]沈阳师范大学物理科学与技术学院,辽宁沈阳110036

出　　处：《现代信息科技》2021年第17期51-54,58,共5页Modern Information Technology

基　　金：国家自然科学基金项目(12075158);辽宁省自然科学基金计划指导计划项目(2019-ZD-0480)。

摘　　要：磁感应断层成像(Magnetic Induction Tomography,MIT)是一种非接触式测量电导率的成像技术,在MIT技术中,纯净稳定的信号是后续工作顺利进行的前提。文章采用DDS技术设计实现的信号发生器,通过AD9851和STC89C51单片机控制,输出正弦波。由于输出的正弦信号有杂波且输出波形有所衰减,文章还设计了低通滤波模块和信号调理放大模块,通过对预期信号与实际信号的对比,发现设计的信号发生器能够满足实验预期,为后续的实验提供良好的信号输出。MIT(Magnetic Induction Tomography)is a non-contact imaging technology for measuring conductivity.In MIT technology,pure and stable signal is the premise for the smooth progress of follow-up work.In this paper,the signal generator designed and implemented by DDS technology is used to output sine wave,controlled by AD9851 and STC89C51 single-chip microcomputer.Because the output sinusoidal signal has clutter and the output waveform is attenuated,this paper also designs a low pass filtering module and signal conditioning and amplification module.Through the comparison between the expected signal and the actual signal,it is found that the signal generator designed in this paper can meet the experimental expectation and provide good signal output for subsequent experiments.

关 键 词：DDS技术 信号发生器 芯片AD9851 单片机STC89C51 低通滤波 

分 类 号：TM935[电气工程—电力电子与电力传动] TN741[电子电信—电路与系统]