基于DFT和虚参考矢量的混频阻抗动态信号测量方法  

Dynamic Mixing Frequency Impedance Measurement Method Based on DFT and Virtual Preference Vector

作　　者：王超[1] 黄春艳[1] 章晓丽[1] 王化祥[1] 

机构地区：[1]天津大学电气与自动化工程学院,天津300072

出　　处：《电子学报》2008年第10期2076-2080,共5页Acta Electronica Sinica

基　　金：国家自然科学基金(No.60672076;50337020;60301008)

摘　　要：为实现对生物阻抗信号在同一时刻,不同频率下的动态检测,本文对混频激励下阻抗信息的提取方法进行了研究,分析了DFT能量泄漏与栅栏效应对正弦信号测量结果的影响,提出了基于DFT和虚参考矢量的混频生物阻抗测量方法.通过仿真和实验,验证了虚参考矢量方法的补偿作用.实验表明,本方法可以通过测量不同频率下的人体阻抗,体现出呼吸、脉搏等信息在不同频率下的动态响应.In order to obtain bio-impedance information in different frequency simultaneously, the bio-impedance measurement method in the condition of mixing frequency excitation is studied in this paper. The influence of energy leakage and fence effect of DFT to sine signal detection is analyzed,according to which the bio-impedance measurement technology based on DFr with virtual preference vector is presented. Finally, the compensation of virtual preference vector is certificated by the emulations and experiments. From the experimental results, the dynamic reaction of respiratory and sphygrnus in different frequency can be manifested according to the human impedance measurement.

关 键 词：阻抗测量 混频激励 离散傅立叶变换解调 虚参考矢量 动态信息检测 

分 类 号：TM938.84[电气工程—电力电子与电力传动] R318.03[医药卫生—生物医学工程]