摘要
针对现有双波长血氧监护仪存在脉搏获取电路输出噪声大、仪器抗震性差等问题,设计一种基于AFE4404的电路用于测量心率及脉搏血氧饱和度(SpO2)。根据朗博比尔定律与经验定标法得到的三波长SpO2计算公式,以此公式为模型设计检测系统。设计中采用TI公司的三波长血氧模拟前端AFE4404芯片结合控制单元,实现脉搏信号采集;采用自主编写的上位机软件,实现心率与SpO2的计算和相关波形的显示。经过实验的验证与分析,得出系统具有输出脉搏信号噪声小、心率及血氧精度高的结论。
In allusion to the problems of large output noise of the pulse acquisition circuit and poor antivibration performance of the current dual-wavelength blood oxygen monitor,an AFE4404-based circuit is designed to measure the heart rate,pulse and blood-oxygen saturation(SpO2).The three-wavelength SpO2 calculation formula is obtained according to the Lambert-Beer law and empirical calibration method,and a detection system is designed by taking the formula as the model.In the design,the three-wavelength oximetry analog front-end AFE4404 chip of the TI Company is used to realize pulse signal acquisition in combination with the control unit.The autonomously-complied upper computer software is used to realize calculation of the heart rate and SpO2,and display of related waveforms.The results of the experimental verification and analysis show that the system can output pulse signals with small noise,and has high accuracy in measurement of the heart rate and blood oxygen.
作者
吴洁
李凯扬
WU Jie;LI Kaiyang(Wuhan University,Wuhan 430072,China)
出处
《现代电子技术》
北大核心
2019年第4期10-13,共4页
Modern Electronics Technique
基金
卫生部专项课题(200801)
武汉市"3551人才计划"资助项目(武新管[2010]210号)~~
