基于AD5940和STM32的生物电阻抗测量系统设计
Design of bioelectrical impedance measurement system based on AD5940 and STM32
王义涛 1陈宏硕 1宋英杰 1张文思 1王登岭 1崔传金1
作者信息
- 1. 华北理工大学电气工程学院,河北唐山 063210
- 折叠
摘要
针对传统阻抗测量系统结构复杂、集成度低和实现成本高等问题,研制了一种频率范围0.01 Hz～200 kHz、支持USB总线的便携式阻抗测量系统.系统采用高精度阻抗转换芯片AD5940 为测量核心,STM32F411RET6 处理器为控制核心,通过上位机设置AD5940 配置参数即可完成单频、多频测量,阻抗数据经USB总线传输至上位机处理、显示及存储.电阻测量实验表明,系统的平均相对误差为0.11%,信噪比为70.15 dB;R-C三元件阻抗模型实验表明,系统的幅值平均绝对误差为0.64 Ω,相角为0.447°,生物电阻抗测量系统具有很好的可靠性与稳定性.
Abstract
Aiming at the problems of complex structure,low integration,and high cost of traditional impedance measurement systems.A portable impedance measurement system with a frequency range of 0.01 Hz to 200 kHz and supporting USB bus is developed.The system adopts the high-precision impedance conversion chip AD5940 as the measurement core and the STM32F411RET6 processor as the control core.AD5940 through the PC configuration parameters can be set up single-frequency and multi-frequency measurement.The impedance data are transmitted to the upper PC for processing through the USB bus,display,and storage.The resistance measurement experiments show that the average relative error of the system is 0.11%,and the SNR is 70.15dB.The R-C three-element impedance model experiment shows that the average absolute error of the system amplitude is 0.64Ω,the phase angle is 0.447°,and the bioelectrical impedance measurement system has good reliability and stability.
关键词
生物电阻抗/多频激励/上位机/阻抗测量系统Key words
bioelectrical impedance/multi-frequency excitation/upper PC/bioimpedance measurement system引用本文复制引用
基金项目
河北省自然科学基金(F2015209308-PT)
河北省青年基金(QN2020194)
出版年
2024
NETL
NSTL
万方数据