毕业设计论文-基于单片机的生物电阻抗频谱测量系统.pdf

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元器件与应用罗仕强等:基于单片机的生物电阻抗频谱测量系统
基于单片机的生物电阻抗频谱测量系统
罗仕强,田华,黄华
(四川大学电气信息学院四川成都 610065)
摘要:测量生物材料幅频和相频特性是研究生物组织电性质的重要方法,同时测量系统的精度决定研究结果的准确
性。针对此项研究,测量系统以 C8051F340 单片机为 MCU ; AD9852 为信号源,产生频率、幅度可调的正弦信号。采用
AD8302 测量组织与标准电阻两端的幅度比和相位差,实现 1 Hz~10 M Hz 频率范围内测量生物组织的频谱特性。实验结
果表明,该系2统实2 时性和精确度较好。
关键词:生物材料;频谱特性;AD9852 ;AD8302
中图分类号: TP274 文献标识码:A 文章编号:1004 373X(2009) 12 146 03
Bioelectrical Impedance Frequency Spectrum Measurement System Based on Single puter
L UO Shiqiang , TIAN Hua , HUAN G Hua
(School of Electrical Engineering and Information ,Sichuan University ,Chengdu ,610065 ,China)
Abstract : The spectrum character of biological materials plays an important role in the research of bioelectrical properties.
And accuracy of the research depends on the precision of measuring system. In this research ,a measurement system is de
signed. C8051F340 used as MCU and AD9852 is chosen to supply Sine signal with variable frequency and amplitude. The mag
nitude ratio and phase are measured by AD8302 between tissue and the standard resistor so as to achieve the bioelectrical im
pedance measurement from 1 Hz~10 M Hz. The experimental result indicates that the system has good real time performance
and accuracy.
Keywords :biological materials ;spectrum character ;AD9852 ;AD8302
测量系统。该系统能全自动、在很短时间内完成从
0 引言
1 Hz~10 M Hz的逐频扫描,并记录和显示各频率点对