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为获得同一时刻,不同频率下的生物电阻抗信息,本文采用混频激励模式,对生物电阻抗进行测量。为了提高系统的测量精度,本文在虚参考矢量方法与乘法解调技术相结合的测量方法基础上构建而成。系统设计中采用了模块化设计思路,并通过DSP实现对各个模块的控制功能。上位机软件采用VB语言编写,主要实现对下位机配置、串口通信、显示数据等功能。以阻容器件为对象,利用Agilent4294A阻抗分析仪对系统进行了标定,证明该系统具有较高精度和准确性;以人体为对象,也获得与阻抗分析仪测量结果趋势一致的生物阻抗信息。
In order to obtain bioelectrical impedance information at the same time and different frequencies, this paper adopts mixing excitation mode to measure bioelectrical impedance. In order to improve the measurement accuracy of the system, this paper is based on the measurement method of virtual reference vector method and multiplication demodulation technique. System design uses a modular design ideas, and through the DSP to achieve the control of each module. PC software written in VB language, the main realization of the next crew configuration, serial communication, display data and other functions. The resistance of the device as a target, the use of Agilent4294A impedance analyzer to calibrate the system to prove that the system has high accuracy and accuracy; the human body as the object, but also with the impedance analyzer measurement results consistent with the trend of bio-impedance information.