基于虚参考点的生物阻抗测量方法  

Biology Impedance Measurement Method Based on a Virtual Reference Point

作　　者：王超[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：《天津大学学报（自然科学与工程技术版）》2005年第4期352-355,共4页Journal of Tianjin University：Science and Technology

基　　金：国家自然科学基金资助项目(60301008; 50337020);天津市自然科学基金资助项目(013614411);天津大学青年教师基金资助项目

摘　　要：针对常规生物电阻抗测量容易引入相位误差的问题,提出了一种基于虚参考点的生物阻抗测量方法,利用虚参考点,通过简单计算可获得被测阻抗的电压信号相对虚参考点的幅值和相位,并根据参考电阻与被测阻抗在矢量空间的对应关系,可计算被测阻抗的模和相角,依据该方法构建了原型机,通过与Agilent4294A阻抗分析仪进行对比,证明该方法可明显地改善人体阻抗测量精度和准确性.A novel biology impedance measurement method based on a virtual reference point is presented in order to solve the problem of the phase error resulted from general biology impedance measurement. The amplitude and phase of the voltage on the measured impedance relative to the virtual reference point can be acquired through simple calculation. According to the corresponding relationship between the reference resistance and the measured impedance in the vector space, the amplitude and phase of the measured impedance can be calcula-(ted.) A prototype system based on the method is constructed. Compared with the Agilent 4294A impedance analyzer the method can markedly improve the detecting precision and accuracy of body impedance.

关 键 词：生物电阻抗测量 乘法解调 正交求解 虚参考点 

分 类 号：TM938.84[电气工程—电力电子与电力传动]