一种基于绿光的可穿戴式光电容积脉搏波测量系统

A wearable photoplethysmography measurement system based on green light

脉搏波中蕴含丰富的血流动力学信息。利用无创的方法检测脉搏波并推导出人体心血管系统生理、病理特征成为研究的热点。设计一套可穿戴式的脉搏波提取设备,该设备包括MCU控制模块、信号采集模块、蓝牙模块、电源模块。分析光电容积法获取脉搏波的原理,采用523 nm绿光和环境光学传感器作为设备核心,详解描述了硬件开发模型,给出了信号处理部分的关键代码。实验结果表明,所设计的脉搏波提取设备在手腕、手指和额头等部位,能够很好地描绘脉搏波,具有很强的应用性。

The pulse wave contains rich hemodynamic information. The non-invasive method used to detect the pulse wave and deduce the physiological and pathological features of human cardiovascular system becomes the research hotspot. A set of wearable pulse wave extraction device was designed, which includes MCU control module, signal acquisition module, power supply module, and Bluetooth module. The principle of photoplethysmography （PPG） to acquire the pulse wave is analyzed. The luminous diode at 523 nm and environmental optical sensor are taken as the core of the device. The hardware development mod- el is described in detail, and the key codes of signal processing are given. The experiment results indicate that the designed pulse wave extraction device can describe the pulse wave of wrists, fingers and forehead, and has good applicability.