oximeter - HR monitor concept note - Chinese

光學式心跳量測簡介(PPG, Photoplethysmography)

http://urclazz.blogspot.tw/2015/09/ppg-photoplethysmography.html

基于反射式原理的腕式血氧饱和度采集装置 Wrist Reflection-type Blood Oxygen Detector
http://oaps.lib.sjtu.edu.cn:8000/oaps/bitstream/123456789/334/1/2013-029-071.pdf