基于Walsh函数的电阻抗成像激励信号分析  

Analysis of Excitation Signal Based on Walsh Function for EIT

作　　者：马硕[1,2] 寇戈[1] 

机构地区：[1]南京理工大学电子工程与光电技术学院 [2]中国人民解放军72465部队

出　　处：《科学技术与工程》2016年第18期44-48,共5页Science Technology and Engineering

基　　金：南京理工大学青年学者基金(Njust200406)资助

摘　　要：电阻抗断层成像(electrical impedance tomography,EIT)技术是一种利用生物组织与器官的电特性,提取与人体生理和病理状况相关信息的医学检测技术。研究了一种基于Walsh函数的同时多频激励信号,分析了该激励信号的数学原理、优势和合成方法。通过能量分析验证了该信号用于EIT系统的可行性。采用Verilog HDL硬件描述语言,在Quartus II平台对以f(5,t)和f(7,t)为例的两个不同信号进行了仿真,结果和理论计算值一致。经过理论计算和实验仿真得出结论:基于Walsh函数的同时多频信号主谐波分量能量占信号总能量的大部分,符合EIT频率要求,是一种可以用于EIT系统的有效激励信号。Electrical impedance tomography（ EIT） is a kind of medical detection technology which uses the electrical characteristics of biological tissues and organs to extract the relevant information of human physiological and pathological conditions. A multi-frequency-one-time excitation signal based on Walsh function is researched,and the mathematical principle,advantages and synthesis methods of the signal are analyzed,and the feasibility of the signal for EIT system is verified by the energy analysis. Two different signals f（ 5,t） and f（ 7,t） are simulated in the Quartus II platform using the Verilog HDL language,and the results are in agreement with the theoretical calculation. After theoretical calculation and experimental simulation,a conclusion was drawn that the energy of main harmonic occupy most of the total energy of the signal,and they meet the requirement of EIT frequency,so the multi-frequency-one-time signal based on Walsh function is a kind of effective excitation signal for EIT system.

关 键 词：电阻抗断层成像 WALSH函数 同时多频 谐波 

分 类 号：TM938.84[电气工程—电力电子与电力传动]