电阻抗系统中同时多频激励信号的实现  

Implementation of Synthesizing Multi-Frequency-One-Time Excitation Signal Based for Electrical Impedance Tomography

作　　者：赵进创[1] 邱斌[1] 李贤宇[1] 黄翀[1] 潘屏萍[1] 

机构地区：[1]广西大学计算机与电子信息学院,南宁530004

出　　处：《计算机测量与控制》2013年第5期1333-1334,1347,共3页Computer Measurement &Control

基　　金：国家自然科学基金项目(60762001);广西高等学校优秀人才计划(桂教人才0804)

摘　　要：为实现在同一时间内对生物体不同组织、器官阻抗的测量,提出一种基于Hadamard序的离散Walsh函数实现同时多频激励信号的方法;利用Hadamard矩阵函数生成离散Hadamard序的Walsh函数,根据Walsh函数不同序之间的转换关系,合成多频激励信号f(K,t)的离散序列,并在CycloneII EP2C35F672C6 FPGA上实现周期f(7,t)输出;实验结果表明,该合成方法具有开发时间短、编程量小和通用性好的优势,便于用FPGA生成具有不同谐波个数的同时多频激励信号。To measure the impedance of different tissues and organs at the same time, this paper proposes a implementation method about synthesizing Multi--Frequency--One--Time excitation signal based on the discrete Hadamard sequence of Walsh functions. The using of Hadamard matrix function generates discrete Hadamard sequence of Walsb functions. The discrete sequences of multi--frequency excitation signal f （K, t） are synthesized according to the conversion relationship between different sequence of Walsh functions, then realized the output of f （7, t） with a field programmable gate array （CycloneII EP2C35F672C6 FPGA）. Experimental results show that the synthetic method has a short development time, a small amount of programming and generally applicability advantages.

关 键 词：生物电阻抗 离散Walsh函数 同时多频激励信号 FPGA 

分 类 号：TH873.7[机械工程—仪器科学与技术]