基于嵌入式的人体电阻抗检测系统的设计与实现

Based on the Embedded Body Electrical Impedance Detection System Design and Implementation

医学上利用对人体各组织与器官的电阻抗检测,可以分析出人体的生理与病理状况,也可以检测人体的脂肪分布情况;文章设计的基于嵌入式的人体电阻抗检测系统,利用嵌入式处理器LPC2148结合低通滤波器产生一个频率为50kHz的射频恒流交变信号,将此信号加于接触人体皮肤的激励电极上,通过检测电极对地的电压就可以计算出相应的电阻抗值;通过对该系统的模拟实验表明,检测值与标准值误差小于±10%,阻抗变化曲线线性良好,这说明该系统的稳定性与准确性均能满足对于人体的电阻抗检测要求,所以该设计具有广泛的应用前景。

The medical use of electrical impedance detection of human tissues and organs that can analyze human physiological and patho logical conditions, can detect human body fat distribution. Incentive electrode designed in this paper use of the embedded processor LPC2148 electrical impedance detection system based on the embedded body, combined with the low pass filter to produce a frequency of 50 kHz RF constant current alternating signal, this signal is applied to the contact with the skin, can be calculated by detecting the voltage of the elec- trode to the electrical impedance value. By the system simulation experiments show that the detection value and standard error of less than± 10%, a good linear impedance curve, which shows the stability and accuracy of the system can meet the testing requirements of the electrical impedance of the human body, so The design has a broad application prospects.