基于调制光源的八通道光电脉搏波检测系统  

Eight-channel photoelectric pulse wave detection system based on modulated light source

作　　者：章朱明 刘玉良[1] 刘红光[2] 杨伟明[1] 孙维一 叶扬扬 ZHANG Zhu-ming;LIU Yu-liang;LIU Hong-guang;YANG Wei-ming;SUN Wei-yi;YE Yang-yang(College of Electronic Information and Automation,Tianjin University of Science&technology,Tianjin 300222,China;Tianjin Institute of metrological supervision and testing,Tianjin 300192,China)

机构地区：[1]天津科技大学电子信息与自动化学院,天津300222 [2]天津市计量监督检测科学研究院,天津300192

出　　处：《光电子．激光》2021年第1期56-63,共8页Journal of Optoelectronics·Laser

基　　金：教育部“天诚汇智”科研创新基金(2018A03033)资助项目。

摘　　要：为了获取多波长的指端光电脉搏波信号来进行脉搏波特征分析,利用STM32F103ZE嵌入式平台设计了基于八波长激光调制光源的脉搏波检测系统。系统光源是由STM32控制的八波长激光组成的调制光源,再由光电二极管构成光电转换电路将光信号转换为易处理的电信号。系统结合巴特沃斯高通滤波电路与切比雪夫低通滤波电路的滤波特性设计了由这两种电路级联构成的带通滤波电路来减小噪声对脉搏波检测的影响,且在电路设计时采用OrCAD PSpice软件来对电路进行优化分析,滤波电路带宽选择0.2~60 Hz,以较大的限度保留光电脉搏波中的有用的生理信息。通过STM32利用分时检测的方法采集八通道脉搏波数据,检测结果显示系统成功检测到八通道光电脉搏波且脉搏波特征清晰,体现出0.2~60 Hz带通滤波电路对光电脉搏波的较好的处理效果。Aiming at obtaining multi-wavelength fingertip photoelectric pulse wav e signals for pulse wave characteristic analysis,a pulse wave detection system based on an eight-wavele ngth laser modulated light source was designed using the STM32F103ZE embedded platform.The system light source is a modulated light source composed of an eight-wavelength laser controlled by STM32,and a photoelectric conversion circuit is formed by a photodiode to convert the optical signal into an easy-to-process electrical si gnal.The system combines the filter characteristics of Butterworth high-pass filter circuit and Chebyshev low-pass filter circuit to design a band-pass filter circuit composed of these two circuits in cascade to reduce the influence of noise on pulse wave detection,and used OrCAD PSpice software to optimize the circuit during circuit design,the f ilter circuit bandwidth choice 0.2~60Hz to retain the useful physiological information in the photoelectric p ulse wave to a larger limit.The eight-channel pulse wave data is collected by STM32using the time-sharing detection method,the detection result shows that the system has successfully detected the eight-channel photoelectric pulse wave and the pulse wave characteristics were clear,which reflected that the 0.2~60Hz bandpass filter circuit had a good processing effect on the photoelectric pulse wave.

关 键 词：光电检测 STM32 八波长调制光源 滤波电路 分时检测法 

分 类 号：TN7O2[电子电信—电路与系统]